Add multithreaded logging infrastructure for preparation for future designs (#225)

* Update class diagrams

* Implement BoundedChannel and multithreaded logging infra

* Integrate logging channel system

* Update string concatenations to use std::format

* Add pretty print log

docs/pipeline/diagrams/current/class.puml

@@ -26,6 +26,7 @@ skinparam note {
 title The Biergarten Data Pipeline - Class Diagram
 
 class BiergartenDataGenerator {
+  - logger_ : std::shared_ptr<ILogger>
   - context_service_ : std::unique_ptr<IEnrichmentService>
   - generator_ : std::unique_ptr<DataGenerator>
   - exporter_ : std::unique_ptr<IExportService>
@@ -36,6 +37,46 @@ class BiergartenDataGenerator {
   - LogResults() : void
 }
 
+class LogLevel <<enumeration>> {
+  Debug
+  Info
+  Warn
+  Error
+}
+
+class PipelinePhase <<enumeration>> {
+  Startup
+  UserGeneration
+  BreweryAndBeerGeneration
+  CheckinGeneration
+  RatingGeneration
+  FollowGeneration
+  Teardown
+}
+
+struct LogEntry {
+  + timestamp : std::chrono::system_clock::time_point
+  + level : LogLevel
+  + phase : PipelinePhase
+  + message : std::string
+  + worker : std::optional<std::string>
+}
+
+interface ILogger <<interface>> {
+  + Log(entry : const LogEntry&) : void
+}
+
+class LogProducer {
+  - channel_ : BoundedChannel<LogEntry>&
+  + Log(entry : const LogEntry&) : void
+}
+
+class LogDispatcher {
+  - channel_ : BoundedChannel<LogEntry>&
+  + Run() : void
+  - ToSpdlogLevel(level) : spdlog::level::level_enum
+}
+
 interface IEnrichmentService <<interface>> {
   + GetLocationContext(loc : const Location&) : std::string
 }
@@ -123,10 +164,17 @@ class SystemDateTimeProvider {
 }
 
 ' Structural Relationships / Dependency Injection
+BiergartenDataGenerator *-- ILogger : owns
 BiergartenDataGenerator *-- IEnrichmentService : owns
 BiergartenDataGenerator *-- DataGenerator : owns
 BiergartenDataGenerator *-- IExportService : owns
 
+LogEntry *-- LogLevel
+LogEntry *-- PipelinePhase
+ILogger <|.. LogProducer : implements
+LogProducer ..> LogEntry : emits
+LogDispatcher ..> LogEntry : consumes
+
 IEnrichmentService <|.. WikipediaService : implements
 WikipediaService *-- WebClient : owns
 

docs/pipeline/diagrams/planned/class.puml

@@ -1,4 +1,4 @@
-@startuml
+@startuml class_diagram
 
 ' ==========================================
 ' CONFIGURATION & STYLING
@@ -8,6 +8,8 @@ skinparam classAttributeFontSize 9
 skinparam defaultFontSize 25
 skinparam titleFontSize 30
 
+title Biergarten Data Pipeline — Class Diagram
+
 package "Domain: Models" {
 
   class Location {
@@ -141,7 +143,7 @@ package "Domain: Models" {
 
   LocationContext *-- Completeness
 }
-@startuml
+
 package "Domain: Application Configuration" {
   class SamplingOptions {
     + temperature: float = 1.0F
@@ -167,12 +169,10 @@ package "Domain: Application Configuration" {
     + pipeline: PipelineOptions
   }
 
-  ' --- Domain Model Relationships ---
   ApplicationOptions *-- GeneratorOptions
   ApplicationOptions *-- PipelineOptions
   GeneratorOptions o-- SamplingOptions
 }
-@endum
 
 package "Domain: Policy" {
 
@@ -275,33 +275,29 @@ package "Infrastructure: Logging" {
     + level : LogLevel
     + phase : PipelinePhase
     + message : std::string
-    + city : std::optional<std::string>
-    + entity_id : std::optional<std::string>
     + worker : std::optional<std::string>
   }
 
-  interface Logger <<interface>> {
+  interface ILogger <<interface>> {
-    + Log(level, phase, message,\n  city, entity_id, worker) : void
+    + Log(entry : const LogEntry&) : void
   }
 
-  class PipelineLogger {
+  class LogProducer {
-    - log_ch_ : BoundedChannel<LogEntry>&
+    - channel_ : BoundedChannel<LogEntry>&
-    + Log(level, phase, message,\n  city, entity_id, worker) : void
+    + Log(entry : const LogEntry&) : void
   }
 
-  class LogWorker {
+  class LogDispatcher {
-    - log_ch_ : BoundedChannel<LogEntry>&
+    - channel_ : BoundedChannel<LogEntry>&
     + Run() : void
-    - FormatTimestamp(tp) : std::string
     - ToSpdlogLevel(level) : spdlog::level::level_enum
-    - ToString(phase) : std::string
   }
 
-  ' --- Logging Relationships ---
   LogEntry       *--  LogLevel
   LogEntry       *--  PipelinePhase
-  PipelineLogger ..>  LogEntry       : emits
+  ILogger        <|.. LogProducer
-  LogWorker      ..>  LogEntry       : consumes
+  LogProducer    ..>  LogEntry       : emits
+  LogDispatcher  ..>  LogEntry       : consumes
 }
 
 package "Infrastructure: Pipeline Channel" {
@@ -363,6 +359,22 @@ package "Infrastructure: Enrichment" {
 
 }
 
+package "Infrastructure: Prompting" {
+
+  interface IPromptDirectory <<interface>> {
+    + Load(key : std::string_view) : std::string
+  }
+
+  class PromptDirectory {
+    - prompt_dir_ : std::filesystem::path
+    - cache_ : std::unordered_map<std::string, std::string>
+    + PromptDirectory(prompt_dir : const std::filesystem::path&)
+    + Load(key : std::string_view) : std::string
+  }
+
+  IPromptDirectory <|.. PromptDirectory
+}
+
 package "Infrastructure: Data Generation" {
 
   interface DataGenerator <<interface>> {
@@ -386,6 +398,7 @@ package "Infrastructure: Data Generation" {
     - model_ : ModelHandle
     - context_ : ContextHandle
     - prompt_formatter_ : std::unique_ptr<PromptFormatter>
+    - prompt_directory_ : std::unique_ptr<IPromptDirectory>
     - rng_ : std::mt19937
     + GenerateBrewery(...) : BreweryResult
     + GenerateBeer(...) : BeerResult
@@ -459,8 +472,6 @@ package "Infrastructure: Data Export" {
 
 }
 
-
-
 class BiergartenPipelineOrchestrator {
   - preloader_ : std::unique_ptr<DataPreloader>
   - enrichment_service_ : std::unique_ptr<EnrichmentService>
@@ -531,6 +542,7 @@ DateTimeProvider               <|.. SystemDateTimeProvider
 WikipediaService               *--  WebClient
 WikipediaService               ..>  ContextStrategy
 LlamaGenerator                 *--  PromptFormatter
+LlamaGenerator                 *--  IPromptDirectory
 LlamaGenerator                 ..>  GeneratorOptions
 SqliteExportService            *--  DateTimeProvider
 

tooling/pipeline/CMakeLists.txt

@@ -138,7 +138,8 @@ FetchContent_MakeAvailable(cpp-httplib)
 
 # 5. Executable & Sources
 add_executable(${PROJECT_NAME}
-        includes/services/enrichment/mock_enrichment.h)
+        includes/services/enrichment/mock_enrichment.h
+        includes/json_handling/pretty_print.h)
 
 # --- Entry point ---
 target_sources(${PROJECT_NAME} PRIVATE
@@ -155,13 +156,13 @@ target_sources(${PROJECT_NAME} PRIVATE
         src/application_options/parse_arguments.cc
 )
 
-# --- biergarten_data_generator ---
+# --- biergarten_pipeline_orchestrator ---
 target_sources(${PROJECT_NAME} PRIVATE
-        src/biergarten_data_generator/log_results.cc
+        src/biergarten_pipeline_orchestrator/log_results.cc
-        src/biergarten_data_generator/biergarten_data_generator.cc
+        src/biergarten_pipeline_orchestrator/biergarten_pipeline_orchestrator.cc
-        src/biergarten_data_generator/generate_breweries.cc
+        src/biergarten_pipeline_orchestrator/generate_breweries.cc
-        src/biergarten_data_generator/run.cc
+        src/biergarten_pipeline_orchestrator/run.cc
-        src/biergarten_data_generator/query_cities_with_countries.cc
+        src/biergarten_pipeline_orchestrator/query_cities_with_countries.cc
 )
 
 # --- web_client ---
@@ -202,17 +203,23 @@ target_sources(${PROJECT_NAME} PRIVATE
 
 # --- services: sqlite ---
 target_sources(${PROJECT_NAME} PRIVATE
-        src/services/sqlite/process_record.cc
+	src/services/sqlite/process_record.cc
-        src/services/sqlite/sqlite_export_service.cc
+	src/services/sqlite/sqlite_export_service.cc
-        src/services/sqlite/finalize.cc
+	src/services/sqlite/finalize.cc
-        src/services/sqlite/initialize.cc
+	src/services/sqlite/initialize.cc
-        src/services/sqlite/helpers/sqlite_connection_helpers.cc
+	src/services/sqlite/helpers/sqlite_connection_helpers.cc
-        src/services/sqlite/helpers/sqlite_statement_helpers.cc
+	src/services/sqlite/helpers/sqlite_statement_helpers.cc
+)
+
+# --- services: logging ---
+target_sources(${PROJECT_NAME} PRIVATE
+	"src/services/logging/log_producer.cc"
+        src/services/logging/log_dispatcher.cc
 )
 
 # --- services (top-level) ---
 target_sources(${PROJECT_NAME} PRIVATE
-        src/services/prompt_directory.cc
+	src/services/prompt_directory.cc
 )
 
 # 6. Include Directories, Link Libraries & Compile Definitions
@@ -242,6 +249,11 @@ target_compile_definitions(${PROJECT_NAME} PRIVATE
         $<$<CONFIG:Debug>:DEBUG>
 )
 
+target_compile_options(biergarten-pipeline PRIVATE
+   -fmacro-prefix-map=${CMAKE_SOURCE_DIR}/tooling/pipeline/src/=
+)
+
+
 # 7. Runtime Assets
 configure_file(
         ${CMAKE_SOURCE_DIR}/locations.json
@@ -253,3 +265,4 @@ add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
         ${CMAKE_SOURCE_DIR}/prompts
         ${CMAKE_BINARY_DIR}/prompts
 )
+

tooling/pipeline/includes/biergarten_pipeline_orchestrator.h

@@ -3,7 +3,10 @@
 
 /**
  * @file biergarten_data_generator.h
- * @brief Core orchestration class for pipeline data generation.
+ * @brief Orchestration for end-to-end brewery data generation pipeline.
+ *
+ * Intent: Coordinates location loading, enrichment, and generation phases
+ * to produce a complete dataset. Coordinates dependencies via composition root.
  */
 
 #include <memory>
@@ -15,25 +18,30 @@
 #include "services/database/export_service.h"
 #include "services/enrichment/enrichment_service.h"
 
+#include "services/logging/logger.h"
+
 /**
  * @brief Main data generator class for the Biergarten pipeline.
  *
  * This class encapsulates the core logic for generating brewery data.
  * It handles location loading, city enrichment, and brewery generation.
  */
-class BiergartenDataGenerator {
+class BiergartenPipelineOrchestrator {
  public:
-  /**
+/**
-   * @brief Construct a BiergartenDataGenerator with injected dependencies.
+ * @brief Constructs the orchestrator with injected pipeline dependencies.
-   *
+ *
-   * @param context_service Context provider for sampled locations.
+ * @param context_service Provides regional context for locations.
-   * @param generator Brewery and user data generator.
+ * @param generator Implementation (Llama or Mock) for brewery/user generation.
-   * @param exporter Storage backend for generated brewery data.
+ * @param exporter Database backend for persisting generated records.
-   */
+ * @param application_options CLI configuration and paths.
-  BiergartenDataGenerator(std::unique_ptr<IEnrichmentService> context_service,
+ */
-                          std::unique_ptr<DataGenerator> generator,
+  BiergartenPipelineOrchestrator(
-                          std::unique_ptr<IExportService> exporter,
+      std::shared_ptr<ILogger> logger,
-                          const ApplicationOptions& application_options);
+      std::unique_ptr<IEnrichmentService> context_service,
+      std::unique_ptr<DataGenerator> generator,
+      std::unique_ptr<IExportService> exporter,
+      const ApplicationOptions& application_options);
 
   /**
    * @brief Run the data generation pipeline.
@@ -43,21 +51,31 @@ class BiergartenDataGenerator {
    * 2. Resolve context for each city using the injected context service
    * 3. Generate brewery data for sampled cities
    *
+   * @note STRUCTURAL CONCURRENCY REQUIREMENT:
+   * When transitioned to a multithreaded design, this method MUST structurally
+   * enforce that all deployed worker threads are joined before returning (e.g.
+   * by using std::jthread or a structured concurrency primitive). This ensures
+   * workers do not attempt to log to a closed channel during application teardown.
+   *
    * @return true if successful, false if not
    */
   bool Run();
 
  private:
+  /// @brief Logger instance for emitting pipeline messages.
+  std::shared_ptr<ILogger> logger_;
+
   /// @brief Owning context provider dependency.
   std::unique_ptr<IEnrichmentService> context_service_;
 
   /// @brief Generator dependency selected in the composition root.
   std::unique_ptr<DataGenerator> generator_;
 
-  /// @brief Storage backend for generated brewery records.
+   /// @brief Storage backend for generated brewery records.
-  std::unique_ptr<IExportService> exporter_;
+   std::unique_ptr<IExportService> exporter_;
 
-  const ApplicationOptions application_options_;
+   /// @brief CLI configuration: paths, model settings, generation parameters.
+   ApplicationOptions application_options_;
 
   /**
    * @brief Load locations from JSON and sample cities.

tooling/pipeline/includes/concurrency/bounded_channel.h

@@ -0,0 +1,73 @@
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_CONCURRENCY_BOUNDED_CHANNEL_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_CONCURRENCY_BOUNDED_CHANNEL_H_
+
+#include <condition_variable>
+#include <cstddef>
+#include <mutex>
+#include <optional>
+#include <queue>
+
+/**
+ * @file bounded_channel.h
+ * @brief Thread-safe, bounded multi-producer/multi-consumer synchronous channel.
+ *
+ * Intent: Enables asynchronous inter-thread communication with backpressure.
+ * Models a synchronous channel where producers/consumers block on capacity limits.
+ */
+
+/**
+ * @class BoundedChannel
+ * @brief MPMC channel with fixed capacity and blocking semantics.
+ *
+ * Producers block when buffer is full; consumers block when empty.
+ * Close() unblocks all waiters and signals channel exhaustion.
+ */
+template <typename T>
+class BoundedChannel {
+  // -------------------------------------------------------------------------
+  // Internal state — all access must be guarded by mutex_.
+  // -------------------------------------------------------------------------
+
+  std::queue<T> queue_;
+
+  std::mutex mutex_;
+
+  std::condition_variable not_full_;
+
+  std::condition_variable not_empty_;
+
+  std::size_t capacity_;
+
+  bool closed_ = false;
+
+ public:
+  /**
+   * @brief Construct a bounded channel with the given capacity.
+   * @param capacity Maximum number of items the channel may hold.
+   */
+  explicit BoundedChannel(std::size_t capacity) : capacity_(capacity) {}
+
+  /**
+   * @brief Send an item into the channel. Blocks when the channel is full.
+   * @param item Move-only item to enqueue.
+   */
+  void Send(T item);
+
+  /**
+   * @brief Receive an item from the channel. Blocks when the channel is
+   * empty.
+   * @return std::optional<T> containing the item, or std::nullopt when the
+   * channel is closed and drained.
+   */
+  std::optional<T> Receive();
+
+  /**
+   * @brief Close the channel and unblock all waiting threads. Idempotent.
+   */
+  void Close();
+};
+
+// Include the template implementation
+#include "bounded_channel.tcc"
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_CONCURRENCY_BOUNDED_CHANNEL_H_

tooling/pipeline/includes/concurrency/bounded_channel.tcc

@@ -0,0 +1,57 @@
+#include "bounded_channel.h"
+
+template <typename T>
+void BoundedChannel<T>::Send(T item) {
+  // Acquire exclusive ownership of the mutex; released automatically on scope exit.
+  std::unique_lock lock(mutex_);
+
+  // Block until there is space in the queue or the channel has been closed.
+  // The predicate guards against spurious wakeups.
+  not_full_.wait(lock, [&] { return queue_.size() < capacity_ || closed_; });
+
+  // If the channel was closed while waiting, discard the item and return.
+  if (closed_) return;
+
+  // Move the item into the queue to avoid an unnecessary copy.
+  queue_.push(std::move(item));
+
+  // Wake one blocked Receive() call to signal that data is now available.
+  not_empty_.notify_one();
+}
+
+template <typename T>
+std::optional<T> BoundedChannel<T>::Receive() {
+  // Acquire exclusive ownership of the mutex.
+  std::unique_lock lock(mutex_);
+
+  // Block until the queue is non-empty or the channel has been closed.
+  // The predicate guards against spurious wakeups.
+  not_empty_.wait(lock, [&] { return !queue_.empty() || closed_; });
+
+  // If woken due to closure and no items remain, signal exhaustion via nullopt.
+  if (queue_.empty()) return std::nullopt;
+
+  // Move the front item out of the queue to avoid an unnecessary copy.
+  T item = std::move(queue_.front());
+  queue_.pop();
+
+  // Wake one blocked Send() call to signal that a slot has opened.
+  not_full_.notify_one();
+
+  return item;
+}
+
+template <typename T>
+void BoundedChannel<T>::Close() {
+  // Acquire exclusive ownership of the mutex to ensure visibility of the flag.
+  std::unique_lock lock(mutex_);
+
+  // Mark the channel as closed; subsequent Send() calls will be dropped.
+  closed_ = true;
+
+  // Wake all blocked Send() callers so they can observe the closed flag and exit.
+  not_full_.notify_all();
+
+  // Wake all blocked Receive() callers so they can drain remaining items or return nullopt.
+  not_empty_.notify_all();
+}

tooling/pipeline/includes/data_generation/llama_generator.h

@@ -18,6 +18,7 @@
 #include "data_generation/data_generator.h"
 #include "data_generation/prompt_formatting/prompt_formatter.h"
 #include "data_model/models.h"
+#include "services/logging/logger.h"
 
 struct llama_model;
 struct llama_context;
@@ -37,7 +38,7 @@ class LlamaGenerator final : public DataGenerator {
    * @param prompt_directory Directory service for loading named prompt files.
    */
   LlamaGenerator(const ApplicationOptions& options,
-                 const std::string& model_path,
+                 const std::string& model_path, std::shared_ptr<ILogger> logger,
                  std::unique_ptr<IPromptFormatter> prompt_formatter,
                  std::unique_ptr<IPromptDirectory> prompt_directory);
 
@@ -130,6 +131,7 @@ class LlamaGenerator final : public DataGenerator {
   std::mt19937 rng_;
   uint32_t n_ctx_ = kDefaultContextSize;
   int n_gpu_layers_ = 0;
+  std::shared_ptr<ILogger> logger_;
   std::unique_ptr<IPromptFormatter> prompt_formatter_;
   std::unique_ptr<IPromptDirectory> prompt_directory_;
 };

tooling/pipeline/includes/data_model/models.h

@@ -10,11 +10,14 @@
 #include <boost/program_options.hpp>
 #include <cstdint>
 #include <filesystem>
+#include <memory>
 #include <optional>
 #include <string>
 #include <string_view>
 #include <vector>
 
+class ILogger;
+
 namespace prog_opts = boost::program_options;
 
 // ============================================================================
@@ -136,6 +139,7 @@ struct ApplicationOptions {
 // Function Declarations
 // ============================================================================
 
-std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv);
+std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv,
+                                                std::shared_ptr<ILogger> logger = nullptr);
 
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_MODELS_H_

tooling/pipeline/includes/json_handling/json_loader.h

@@ -7,16 +7,19 @@
  */
 
 #include <filesystem>
+#include <memory>
 #include <vector>
 
 #include "data_model/models.h"
+#include "services/logging/logger.h"
 
 /// @brief Loads curated world locations from a JSON file into memory.
 class JsonLoader {
  public:
   /// @brief Parses a JSON array file and returns all location records.
   static std::vector<Location> LoadLocations(
-      const std::filesystem::path& filepath);
+      const std::filesystem::path& filepath,
+      std::shared_ptr<ILogger> logger = nullptr);
 };
 
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_JSON_HANDLING_JSON_LOADER_H_

tooling/pipeline/includes/json_handling/pretty_print.h

@@ -0,0 +1,109 @@
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_JSON_HANDLING_PRETTY_PRINT_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_JSON_HANDLING_PRETTY_PRINT_H_
+
+/**
+ * @file json_handling/pretty_print.h
+ * @brief Pretty-printing utilities for JSON values.
+ *
+ * Provides formatting capability for boost::json::value with indentation and
+ * readable output. Adapted from Boost JSON library examples.
+ */
+
+#include <boost/json.hpp>
+#include <ostream>
+#include <string>
+
+/**
+ * @brief Pretty-prints a JSON value to an output stream with indentation.
+ *
+ * Recursively formats JSON objects and arrays with consistent 4-space
+ * indentation. Adapted from:
+ * https://raw.githubusercontent.com/boostorg/json/refs/heads/develop/example/pretty.cpp
+ *
+ * @param outstream Output stream to write formatted JSON.
+ * @param json_val JSON value to format.
+ * @param indent Optional indentation string (managed internally on first call).
+ */
+inline void PrettyPrint(std::ostream& outstream,
+                        boost::json::value const& json_val,
+                        std::string* indent = nullptr) {
+  std::string str;
+  if (indent == nullptr) {
+    indent = &str;
+  }
+  switch (json_val.kind()) {
+    case boost::json::kind::object: {
+      outstream << "{\n";
+      indent->append(4, ' ');
+      auto const& obj = json_val.get_object();
+      if (!obj.empty()) {
+        const auto* iter = obj.begin();
+        for (;;) {
+          outstream << *indent << boost::json::serialize(iter->key()) << " : ";
+          PrettyPrint(outstream, iter->value(), indent);
+          iter = std::next(iter);
+          if (iter == obj.end()) {
+            break;
+          }
+
+          outstream << ",\n";
+        }
+      }
+      outstream << "\n";
+      indent->resize(indent->size() - 4);
+      outstream << *indent << "}";
+      break;
+    }
+
+    case boost::json::kind::array: {
+      outstream << "[\n";
+      indent->append(4, ' ');
+      auto const& arr = json_val.get_array();
+      if (!arr.empty()) {
+        const auto* iter = arr.begin();
+        for (;;) {
+          outstream << *indent;
+          PrettyPrint(outstream, *iter, indent);
+          iter = std::next(iter);
+          if (iter == arr.end()) {
+            break;
+          }
+          outstream << ",\n";
+        }
+      }
+      outstream << "\n";
+      indent->resize(indent->size() - 4);
+      outstream << *indent << "]";
+      break;
+    }
+
+    case boost::json::kind::string: {
+      outstream << serialize(json_val.get_string());
+      break;
+    }
+
+    case boost::json::kind::uint64:
+    case boost::json::kind::int64:
+    case boost::json::kind::double_:
+      outstream << json_val;
+      break;
+
+    case boost::json::kind::bool_:
+      if (json_val.get_bool()) {
+        outstream << "true";
+      } else {
+        outstream << "false";
+      }
+      break;
+
+    case boost::json::kind::null:
+      outstream << "null";
+      break;
+  }
+
+  if (indent->empty()) {
+    outstream << "\n";
+  }
+}
+
+#endif

tooling/pipeline/includes/services/enrichment/wikipedia_service.h

@@ -12,13 +12,15 @@
 #include <unordered_map>
 
 #include "enrichment_service.h"
+#include "services/logging/logger.h"
 #include "web_client/web_client.h"
 
 /// @brief Provides Wikipedia summary lookups backed by cached raw extracts.
 class WikipediaEnrichmentService final : public IEnrichmentService {
  public:
   /// @brief Creates a new Wikipedia service with the provided web client.
-  explicit WikipediaEnrichmentService(std::unique_ptr<WebClient> client);
+  explicit WikipediaEnrichmentService(std::unique_ptr<WebClient> client,
+                                      std::shared_ptr<ILogger> logger);
 
   /// @brief Returns the Wikipedia-derived context for a location.
   [[nodiscard]] std::string GetLocationContext(const Location& loc) override;
@@ -26,6 +28,7 @@ class WikipediaEnrichmentService final : public IEnrichmentService {
  private:
   std::string FetchExtract(std::string_view query);
   std::unique_ptr<WebClient> client_;
+  std::shared_ptr<ILogger> logger_;
   /// @brief Canonical cache for raw Wikipedia query extracts.
   std::unordered_map<std::string, std::string> extract_cache_;
 };

tooling/pipeline/includes/services/logging/log_dispatcher.h

@@ -0,0 +1,53 @@
+/**
+ * @file services/logging/log_dispatcher.h
+ * @brief Dedicated log dispatcher for asynchronous pipeline logging.
+ *
+ * The dispatcher drains LogEntry values from a bounded channel and forwards
+ * them to spdlog on a dedicated thread.
+ */
+
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_DISPATCHER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_DISPATCHER_H_
+
+#include <spdlog/spdlog.h>
+
+#include "concurrency/bounded_channel.h"
+#include "services/logging/log_entry.h"
+
+/**
+ * @class LogDispatcher
+ * @brief Consumes log entries from a channel and forwards them to spdlog.
+ *
+ * Non-copyable and non-movable. Intended to run on its own dedicated thread
+ * and exit once the channel has been closed and drained.
+ */
+class LogDispatcher {
+ public:
+  /**
+   * @brief Construct a log dispatcher.
+   *
+   * @param channel Reference to the bounded channel used for log retrieval.
+   */
+  explicit LogDispatcher(BoundedChannel<LogEntry>& channel);
+
+  LogDispatcher(const LogDispatcher&) = delete;
+  LogDispatcher& operator=(const LogDispatcher&) = delete;
+  LogDispatcher(LogDispatcher&&) = delete;
+  LogDispatcher& operator=(LogDispatcher&&) = delete;
+  ~LogDispatcher() = default;
+
+  /**
+   * @brief Drain the channel and forward entries to spdlog.
+   *
+   * Intended to be called once on a dedicated thread. The loop returns after
+   * the channel has been closed and all queued entries have been processed.
+   */
+  void Run();
+
+ private:
+  BoundedChannel<LogEntry>& channel_;
+
+  static spdlog::level::level_enum ToSpdlogLevel(LogLevel level);
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_DISPATCHER_H_

tooling/pipeline/includes/services/logging/log_entry.h

@@ -0,0 +1,88 @@
+/**
+ * @file services/logging/log_entry.h
+ * @brief Structured log record shared by the pipeline logging infra.
+ *
+ * LogEntry is a lightweight value type that can be passed safely between the
+ * logging producer and dispatcher through BoundedChannel<LogEntry>.
+ */
+
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_ENTRY_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_ENTRY_H_
+
+#include <chrono>
+#include <source_location>
+#include <string>
+#include <thread>
+#include <vector>
+
+/**
+ * @enum LogLevel
+ * @brief Severity levels supported by the logging infra.
+ */
+enum class LogLevel {
+  Debug,  ///< Development/debugging information.
+  Info,   ///< General informational messages.
+  Warn,   ///< Warning conditions.
+  Error,  ///< Error conditions.
+};
+
+/**
+ * @enum PipelinePhase
+ * @brief Pipeline execution phases used to tag log records.
+ *
+ * The phase tag makes it easier to correlate log output with the part of the
+ * pipeline that emitted it.
+ */
+enum class PipelinePhase {
+  Startup,                   ///< Initialization and validation.
+  UserGeneration,            ///< User profile generation.
+  BreweryAndBeerGeneration,  ///< Brewery and beer data generation.
+  CheckinGeneration,         ///< Checkin (visit) record generation.
+  RatingGeneration,          ///< Rating and review generation.
+  FollowGeneration,          ///< Follow relationship generation.
+  Teardown,                  ///< Finalization and cleanup.
+};
+
+/**
+ * @struct LogDTO
+ * @brief User-provided subset of log fields. Used to capture call-site info transparently.
+ */
+struct LogDTO {
+  LogLevel level;
+  PipelinePhase phase;
+  std::string message;
+};
+
+/**
+ * @struct LogEntry
+ * @brief Single structured log event.
+ *
+ * All fields are value types, which keeps transfer across the bounded channel
+ * simple and avoids shared ownership.
+ *
+ * NOTE: timestamp, thread_id, and origin must be populated by ILogger::Log()
+ * before the entry is dispatched.
+ */
+struct LogEntry {
+  /// @brief Timestamp when the entry was created.
+  std::chrono::system_clock::time_point timestamp{};
+
+  /// @brief Source location where the log call was made.
+  std::source_location origin{};
+
+  /// @brief Thread responsible for emitting the log.
+  std::thread::id thread_id{};
+
+
+  /// @brief Severity level of this entry.
+  LogLevel level;
+
+  /// @brief Pipeline phase associated with the entry.
+  PipelinePhase phase;
+
+  /// @brief Log message text.
+  std::string message;
+
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_ENTRY_H_

tooling/pipeline/includes/services/logging/log_producer.h

@@ -0,0 +1,53 @@
+/**
+ * @file services/logging/log_producer.h
+ * @brief Channel-backed log producer for asynchronous pipeline logging.
+ *
+ * The producer captures log records from application code and forwards them to
+ * a bounded channel for later processing by the dispatcher.
+ */
+
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_CHANNEL_LOGGER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_CHANNEL_LOGGER_H_
+
+#include <string_view>
+
+#include "concurrency/bounded_channel.h"
+#include "services/logging/log_entry.h"
+#include "services/logging/logger.h"
+
+/**
+ * @class LogProducer
+ * @brief ILogger implementation that forwards entries to a bounded channel.
+ *
+ * Non-copyable and non-movable. The channel reference is non-owning and must
+ * remain valid for the lifetime of the producer.
+ */
+class LogProducer final : public ILogger {
+ public:
+  /**
+   * @brief Construct a channel-backed producer.
+   *
+   * @param channel Reference to the bounded channel used for log transfer.
+   */
+  explicit LogProducer(BoundedChannel<LogEntry>& channel);
+
+  LogProducer(const LogProducer&) = delete;
+  LogProducer& operator=(const LogProducer&) = delete;
+  LogProducer(LogProducer&&) = delete;
+  LogProducer& operator=(LogProducer&&) = delete;
+
+  ~LogProducer() override = default;
+
+  /**
+   * @brief Queue a log message for asynchronous processing.
+   *
+   * Blocks while the channel applies backpressure. This blocking behavior
+   * under heavy load is an accepted trade-off for simplicity.
+   */
+  void DoLog(LogEntry log_entry) override;
+
+ private:
+  BoundedChannel<LogEntry>& channel_;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_CHANNEL_LOGGER_H_

tooling/pipeline/includes/services/logging/logger.h

@@ -0,0 +1,64 @@
+/**
+ * @file services/logging/logger.h
+ * @brief Abstract logging interface used by pipeline components.
+ *
+ * The interface keeps application code independent from the concrete logging
+ * transport, buffering, and formatting implementation.
+ */
+
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOGGER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOGGER_H_
+
+#include <source_location>
+#include <string>
+#include <utility>
+
+#include "services/logging/log_entry.h"
+
+/**
+ * @class ILogger
+ * @brief Minimal interface for submitting structured log messages.
+ *
+ * Implementations are non-copyable and non-movable. They are typically owned
+ * by the composition root and injected into services that emit diagnostics.
+ */
+class ILogger {
+ public:
+  ILogger() = default;
+  ILogger(const ILogger&) = delete;
+  ILogger& operator=(const ILogger&) = delete;
+  ILogger(ILogger&&) = delete;
+  ILogger& operator=(ILogger&&) = delete;
+  virtual ~ILogger() = default;
+
+  /**
+   * @brief Submit a log message to the logging subsystem.
+   *
+   * @param payload User-provided log data (level, phase, message).
+   * @param origin Auto-captured source location of the call site.
+   */
+  void Log(LogDTO payload,
+           std::source_location origin = std::source_location::current(),
+           std::chrono::system_clock::time_point timestamp = std::chrono::system_clock::now(),
+           std::thread::id thread_id = std::this_thread::get_id()) {
+    LogEntry entry;
+    entry.timestamp = timestamp;
+    entry.thread_id = thread_id;
+    entry.level = payload.level;
+    entry.phase = payload.phase;
+    entry.message = std::move(payload.message);
+    entry.origin = origin;
+    DoLog(std::move(entry));
+  }
+
+ protected:
+  /**
+   * @brief Underlying implementation to transport the log entry.
+   *
+   * Implementations must be thread-safe as DoLog can be called concurrently
+   * from multiple worker threads.
+   */
+  virtual void DoLog(LogEntry log_entry) = 0;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOGGER_H_

tooling/pipeline/includes/services/prompting/prompt_directory.h

@@ -12,11 +12,14 @@
  */
 
 #include <filesystem>
+#include <memory>
 #include <stdexcept>
 #include <string>
 #include <string_view>
 #include <unordered_map>
 
+#include "services/logging/logger.h"
+
 /**
  * @brief Interface for loading named prompt files.
  */
@@ -56,6 +59,8 @@ class PromptDirectory final : public IPromptDirectory {
    *         directory.
    */
   explicit PromptDirectory(const std::filesystem::path& prompt_dir);
+  PromptDirectory(const std::filesystem::path& prompt_dir,
+                  std::shared_ptr<ILogger> logger);
 
   /**
    * @brief Loads the prompt for @p key, caching the result.
@@ -70,6 +75,7 @@ class PromptDirectory final : public IPromptDirectory {
 
  private:
   std::filesystem::path prompt_dir_;
+  std::shared_ptr<ILogger> logger_;
   std::unordered_map<std::string, std::string> cache_;
 };
 

tooling/pipeline/includes/web_client/http_web_client.h

@@ -8,8 +8,11 @@
 
 
 #include "web_client/web_client.h"
+#include "services/logging/logger.h"
 
+#include <memory>
 #include <string>
+#include <utility>
 
 /**
  * @brief WebClient implementation backed by cpp-httplib.
@@ -24,7 +27,8 @@
  */
 class HttpWebClient final : public WebClient {
 public:
-  HttpWebClient() = default;
+  explicit HttpWebClient(std::shared_ptr<ILogger> logger)
+      : logger_(std::move(logger)) {}
   ~HttpWebClient() override = default;
 
   /**
@@ -43,6 +47,9 @@ public:
    * @return Percent-encoded string safe for use in a URL.
    */
   std::string EncodeURL(const std::string& value) override;
+
+ private:
+  std::shared_ptr<ILogger> logger_;
 };
 
 

tooling/pipeline/src/application_options/parse_arguments.cc

@@ -1,12 +1,15 @@
-#include <spdlog/spdlog.h>
+#include <chrono>
-
+#include <format>
+#include <iostream>
 #include <optional>
 #include <sstream>
 #include <string>
 
 #include "data_model/models.h"
+#include "services/logging/logger.h"
 
-std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
+std::optional<ApplicationOptions> ParseArguments(
+    const int argc, char** argv, std::shared_ptr<ILogger> logger) {
   prog_opts::options_description desc("Pipeline Options");
   auto opt = desc.add_options();
 
@@ -61,10 +64,20 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
 
   // No flags provided — treat as a help request rather than an error.
   if (argc == 1) {
-    spdlog::info("Biergarten Pipeline");
+    const std::string title = "Biergarten Pipeline";
-    std::stringstream usage_stream;
+    const std::string usage = ([&] {
-    usage_stream << "\nUsage: biergarten-pipeline [options]\n\n" << desc;
+      std::stringstream usage_stream;
-    spdlog::info(usage_stream.str());
+      usage_stream << "\nUsage: biergarten-pipeline [options]\n\n" << desc;
+      return usage_stream.str();
+    })();
+    if (logger) {
+      logger->Log(LogDTO{.level = LogLevel::Info,
+                   .phase = PipelinePhase::Startup,
+                   .message = title});
+      logger->Log(LogDTO{.level = LogLevel::Info,
+                   .phase = PipelinePhase::Startup,
+                   .message = usage});
+    }
     return std::nullopt;
   }
 
@@ -76,7 +89,11 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
     if (var_map.contains("help")) {
       std::stringstream help_stream;
       help_stream << "\n" << desc;
-      spdlog::info(help_stream.str());
+      if (logger) {
+        logger->Log(LogDTO{.level = LogLevel::Info,
+                     .phase = PipelinePhase::Startup,
+                     .message = help_stream.str()});
+      }
       return std::nullopt;
     }
 
@@ -85,8 +102,7 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
     options.pipeline.output_path = var_map["output"].as<std::string>();
     options.pipeline.log_path = var_map["log-path"].as<std::string>();
     options.pipeline.prompt_dir = var_map["prompt-dir"].as<std::string>();
-    options.pipeline.location_count =
+    options.pipeline.location_count = var_map["location-count"].as<uint32_t>();
-      var_map["location-count"].as<uint32_t>();
 
     const bool use_mocked = var_map["mocked"].as<bool>();
     const std::string model_path = var_map["model"].as<std::string>();
@@ -94,23 +110,43 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
 
     // Enforce mutual exclusivity before any further configuration is applied.
     if (use_mocked && !model_path.empty()) {
-      spdlog::error(
+      const std::string msg =
-          "Invalid arguments: --mocked and --model are mutually exclusive");
+          "Invalid arguments: --mocked and --model are mutually exclusive";
+      if (logger) {
+        logger->Log(LogDTO{.level = LogLevel::Error,
+                     .phase = PipelinePhase::Startup,
+                     .message = msg});
+      } else {
+        std::cerr << msg << std::endl;
+      }
       return std::nullopt;
     }
 
     if (!use_mocked && model_path.empty()) {
-      spdlog::error(
+      const std::string msg =
-          "Invalid arguments: either --mocked or --model must be specified");
+          "Invalid arguments: either --mocked or --model must be specified";
+      if (logger) {
+        logger->Log(LogDTO{.level = LogLevel::Error,
+                     .phase = PipelinePhase::Startup,
+                     .message = msg});
+      } else {
+        std::cerr << msg << std::endl;
+      }
       return std::nullopt;
     }
 
     // Prompt directory is only meaningful for live inference — the mock
     // generator has no use for it and should not require it to be present.
     if (!use_mocked && options.pipeline.prompt_dir.empty()) {
-      spdlog::error(
+      const std::string msg =
-          "Invalid arguments: --prompt-dir is required when not using "
+          "Invalid arguments: --prompt-dir is required when not using --mocked";
-          "--mocked");
+      if (logger) {
+        logger->Log({.level = LogLevel::Error,
+                     .phase = PipelinePhase::Startup,
+                     .message = msg});
+      } else {
+        std::cerr << msg << std::endl;
+      }
       return std::nullopt;
     }
 
@@ -131,7 +167,15 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
       // Warn but do not fail — the run is still valid, the flags are just
       // silently irrelevant when no model is loaded.
       if (use_mocked) {
-        spdlog::warn("Sampling parameters are ignored when using --mocked");
+        const std::string msg =
+            "Sampling parameters are ignored when using --mocked";
+        if (logger) {
+          logger->Log(LogDTO{.level = LogLevel::Warn,
+                       .phase = PipelinePhase::Startup,
+                       .message = msg});
+        } else {
+          std::cerr << msg << std::endl;
+        }
       } else {
         SamplingOptions sampling;
         sampling.temperature = var_map["temperature"].as<float>();
@@ -148,11 +192,23 @@ std::optional<ApplicationOptions> ParseArguments(const int argc, char** argv) {
     return options;
 
   } catch (const std::exception& exception) {
-    spdlog::error("Failed to parse command-line arguments: {}",
+    const std::string msg =
-                  exception.what());
+        std::string("Failed to parse command-line arguments: ") +
+        exception.what();
+    if (logger) {
+      logger->Log(LogDTO{.level = LogLevel::Error,
+                   .phase = PipelinePhase::Startup,
+                   .message = msg});
+    }
     return std::nullopt;
   } catch (...) {
-    spdlog::error("Failed to parse command-line arguments: unknown error");
+    const std::string msg =
+        "Failed to parse command-line arguments: unknown error";
+    if (logger) {
+      logger->Log(LogDTO{.level = LogLevel::Error,
+                   .phase = PipelinePhase::Startup,
+                   .message = msg});
+    }
     return std::nullopt;
   }
 }

tooling/pipeline/src/biergarten_data_generator/generate_breweries.cc

@@ -1,58 +0,0 @@
-/**
- * @file biergarten_data_generator/generate_breweries.cc
- * @brief BiergartenDataGenerator::GenerateBreweries() implementation.
- */
-
-#include <spdlog/spdlog.h>
-
-#include "biergarten_data_generator.h"
-
-void BiergartenDataGenerator::GenerateBreweries(
-    std::span<const EnrichedCity> cities) {
-  spdlog::info("\n=== SAMPLE BREWERY GENERATION ===");
-
-  generated_breweries_.clear();
-  size_t skipped_count = 0;
-  size_t export_failed_count = 0;
-
-  for (const auto& [location, region_context] : cities) {
-    try {
-      const BreweryResult brewery =
-          generator_->GenerateBrewery(location, region_context);
-
-      const GeneratedBrewery gen{.location = location, .brewery = brewery};
-
-      generated_breweries_.push_back(gen);
-
-      try {
-        exporter_->ProcessRecord(gen);
-      } catch (const std::exception& export_exception) {
-        ++export_failed_count;
-
-        spdlog::warn(
-            "[Pipeline] Generated brewery for '{}' ({}) but SQLite export "
-            "failed: {}",
-            location.city, location.country, export_exception.what());
-      }
-    } catch (const std::exception& e) {
-      ++skipped_count;
-
-      spdlog::warn(
-          "[Pipeline] Skipping city '{}' ({}): brewery generation failed: "
-          "{}",
-          location.city, location.country, e.what());
-    }
-  }
-
-  if (skipped_count > 0) {
-    spdlog::warn("[Pipeline] Skipped {} city/cities due to generation errors",
-                 skipped_count);
-  }
-
-  if (export_failed_count > 0) {
-    spdlog::warn(
-        "[Pipeline] Failed to export {} generated brewery/breweries to "
-        "SQLite",
-        export_failed_count);
-  }
-}

tooling/pipeline/src/biergarten_data_generator/log_results.cc

@@ -1,26 +0,0 @@
-/**
- * @file biergarten_data_generator/log_results.cc
- * @brief BiergartenDataGenerator::LogResults() implementation.
- */
-
-#include <spdlog/spdlog.h>
-
-#include "biergarten_data_generator.h"
-
-void BiergartenDataGenerator::LogResults() const {
-  spdlog::info("\n=== GENERATED DATA DUMP ===");
-  size_t index = 1;
-  for (const auto& [location, brewery] : generated_breweries_) {
-    spdlog::info(
-        "{}. city=\"{}\" country=\"{}\" state=\"{}\" "
-        "iso3166_2={} lat={} lon={}",
-        index, location.city, location.country, location.state_province,
-        location.iso3166_2, location.latitude, location.longitude);
-    spdlog::info("   brewery_name_en=\"{}\"", brewery.name_en);
-    spdlog::info("   brewery_description_en=\"{}\"", brewery.description_en);
-    spdlog::info("   brewery_name_local=\"{}\"", brewery.name_local);
-    spdlog::info("   brewery_description_local=\"{}\"",
-                 brewery.description_local);
-    ++index;
-  }
-}

tooling/pipeline/src/biergarten_data_generator/query_cities_with_countries.cc

@@ -1,41 +0,0 @@
-/**
- * @file biergarten_data_generator/query_cities_with_countries.cc
- * @brief BiergartenDataGenerator::QueryCitiesWithCountries() implementation.
- */
-
-#include <spdlog/spdlog.h>
-
-#include <algorithm>
-#include <filesystem>
-#include <iterator>
-#include <random>
-
-#include "biergarten_data_generator.h"
-#include "json_handling/json_loader.h"
-
-std::vector<Location> BiergartenDataGenerator::QueryCitiesWithCountries() {
-  spdlog::info("\n=== GEOGRAPHIC DATA OVERVIEW ===");
-
-  const std::filesystem::path locations_path = "locations.json";
-
-  auto all_locations = JsonLoader::LoadLocations(locations_path);
-  spdlog::info("  Locations available: {}", all_locations.size());
-
-  const size_t sample_count = std::min(
-      static_cast<size_t>(application_options_.pipeline.location_count),
-      all_locations.size());
-
-  const auto sample_count_signed =
-      static_cast<std::iter_difference_t<decltype(all_locations.cbegin())>>(
-          sample_count);
-
-  std::vector<Location> sampled_locations;
-  sampled_locations.reserve(sample_count);
-
-  std::random_device random_generator;
-  std::ranges::sample(all_locations, std::back_inserter(sampled_locations),
-                      sample_count_signed, random_generator);
-
-  spdlog::info("  Sampled locations: {}", sampled_locations.size());
-  return sampled_locations;
-}

tooling/pipeline/src/biergarten_data_generator/run.cc

@@ -1,52 +0,0 @@
-/**
- * @file biergarten_data_generator/run.cc
- * @brief BiergartenDataGenerator::Run() implementation.
- */
-
-#include <spdlog/spdlog.h>
-
-#include <utility>
-
-#include "biergarten_data_generator.h"
-
-bool BiergartenDataGenerator::Run() {
-  try {
-    exporter_->Initialize();
-
-    std::vector<Location> cities = QueryCitiesWithCountries();
-    std::vector<EnrichedCity> enriched;
-    enriched.reserve(cities.size());
-
-    size_t skipped_count = 0;
-    for (auto& city : cities) {
-      try {
-        std::string region_context = context_service_->GetLocationContext(city);
-        // spdlog::debug("[Pipeline] Context for '{}' ({}) gathered:\n{}",
-        //               city.city, city.iso3166_2, region_context);
-
-        enriched.push_back(
-            EnrichedCity{.location = std::move(city),
-                         .region_context = std::move(region_context)});
-      } catch (const std::exception& exception) {
-        ++skipped_count;
-        spdlog::warn(
-            "[Pipeline] Skipping city '{}' ({}): context lookup failed: {}",
-            city.city, city.country, exception.what());
-      }
-    }
-
-    if (skipped_count > 0) {
-      spdlog::warn(
-          "[Pipeline] Skipped {} city/cities due to context lookup errors",
-          skipped_count);
-    }
-
-    this->GenerateBreweries(enriched);
-    exporter_->Finalize();
-    this->LogResults();
-    return true;
-  } catch (const std::exception& e) {
-    spdlog::error("Pipeline execution failed with error: {}", e.what());
-    return false;
-  }
-}

tooling/pipeline/src/biergarten_pipeline_orchestrator/biergarten_pipeline_orchestrator.cc

@@ -1,18 +1,20 @@
 /**
- * @file biergarten_data_generator/biergarten_data_generator.cc
+ * @file biergarten_pipeline_orchestrator/biergarten_pipeline_orchestrator.cc
  * @brief BiergartenDataGenerator constructor implementation.
  */
 
-#include "biergarten_data_generator.h"
+#include "biergarten_pipeline_orchestrator.h"
 
 #include <utility>
 
-BiergartenDataGenerator::BiergartenDataGenerator(
+BiergartenPipelineOrchestrator::BiergartenPipelineOrchestrator(
+    std::shared_ptr<ILogger> logger,
     std::unique_ptr<IEnrichmentService> context_service,
     std::unique_ptr<DataGenerator> generator,
     std::unique_ptr<IExportService> exporter,
     const ApplicationOptions &app_options)
-    : context_service_(std::move(context_service)),
+    : logger_(std::move(logger)),
+      context_service_(std::move(context_service)),
       generator_(std::move(generator)),
       exporter_(std::move(exporter)),
       application_options_(app_options) {}

tooling/pipeline/src/biergarten_pipeline_orchestrator/generate_breweries.cc

@@ -0,0 +1,68 @@
+/**
+ * @file biergarten_pipeline_orchestrator/generate_breweries.cc
+ * @brief BiergartenDataGenerator::GenerateBreweries() implementation.
+ */
+
+#include <chrono>
+#include <format>
+
+#include "biergarten_pipeline_orchestrator.h"
+#include "services/logging/logger.h"
+
+void BiergartenPipelineOrchestrator::GenerateBreweries(
+    std::span<const EnrichedCity> cities) {
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::BreweryAndBeerGeneration,
+                .message = "=== SAMPLE BREWERY GENERATION ==="});
+
+  generated_breweries_.clear();
+  size_t skipped_count = 0;
+  size_t export_failed_count = 0;
+
+  for (const auto& [location, region_context] : cities) {
+    try {
+      const BreweryResult brewery =
+          generator_->GenerateBrewery(location, region_context);
+
+      const GeneratedBrewery gen{.location = location, .brewery = brewery};
+
+      generated_breweries_.push_back(gen);
+
+      try {
+        exporter_->ProcessRecord(gen);
+      } catch (const std::exception& export_exception) {
+        ++export_failed_count;
+
+        logger_->Log(
+            {.level = LogLevel::Warn,
+             .phase = PipelinePhase::BreweryAndBeerGeneration,
+             .message =
+                 std::format("[Pipeline] Generated brewery for '{}' ({}) but SQLite export failed: {}",
+                 location.city, location.country, export_exception.what())});
+      }
+    } catch (const std::exception& e) {
+      ++skipped_count;
+
+      logger_->Log({.level = LogLevel::Warn,
+                    .phase = PipelinePhase::BreweryAndBeerGeneration,
+                    .message = std::format("[Pipeline] Skipping city '{}' ({}): brewery generation failed: {}",
+                               location.city, location.country, e.what())});
+    }
+  }
+
+  if (skipped_count > 0) {
+    logger_->Log({.level = LogLevel::Warn,
+                  .phase = PipelinePhase::BreweryAndBeerGeneration,
+                  .message = std::format(
+                      "[Pipeline] Skipped {} city/cities due to generation errors",
+                      skipped_count)});
+  }
+
+  if (export_failed_count > 0) {
+    logger_->Log({.level = LogLevel::Warn,
+                  .phase = PipelinePhase::Teardown,
+                  .message = std::format(
+                      "[Pipeline] Failed to export {} generated brewery/breweries to SQLite",
+                      export_failed_count)});
+  }
+}

tooling/pipeline/src/biergarten_pipeline_orchestrator/log_results.cc

@@ -0,0 +1,37 @@
+/**
+ * @file biergarten_pipeline_orchestrator/log_results.cc
+ * @brief BiergartenDataGenerator::LogResults() implementation.
+ */
+
+#include <boost/json/array.hpp>
+#include <chrono>
+#include <format>
+
+#include "../../includes/json_handling/pretty_print.h"
+#include "biergarten_pipeline_orchestrator.h"
+#include "services/logging/logger.h"
+void BiergartenPipelineOrchestrator::LogResults() const {
+  boost::json::array output;
+
+  for (const auto& [location, brewery] : generated_breweries_) {
+    output.push_back(boost::json::object{
+        {"name_en", brewery.name_en},
+        {"description_en", brewery.description_en},
+        {"name_local", brewery.name_local},
+        {"description_local", brewery.description_local},
+        {"location", boost::json::object{
+                         {"city", location.city},
+                         {"country", location.country},
+                         {"state_province", location.state_province},
+                         {"iso3166_2", location.iso3166_2},
+                         {"latitude", location.latitude},
+                         {"longitude", location.longitude},
+                     }}});
+  }
+
+  std::ostringstream oss;
+  PrettyPrint(oss, output);
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::Teardown,
+                .message = oss.str()});
+}

tooling/pipeline/src/biergarten_pipeline_orchestrator/query_cities_with_countries.cc

@@ -0,0 +1,51 @@
+/**
+ * @file biergarten_pipeline_orchestrator/query_cities_with_countries.cc
+ * @brief BiergartenDataGenerator::QueryCitiesWithCountries() implementation.
+ */
+
+#include <algorithm>
+#include <chrono>
+#include <filesystem>
+#include <format>
+#include <iterator>
+#include <random>
+
+#include "biergarten_pipeline_orchestrator.h"
+#include "json_handling/json_loader.h"
+#include "services/logging/logger.h"
+
+std::vector<Location>
+BiergartenPipelineOrchestrator::QueryCitiesWithCountries() {
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::Startup,
+                .message = "=== GEOGRAPHIC DATA OVERVIEW ==="});
+
+  const std::filesystem::path locations_path = "locations.json";
+
+  auto all_locations = JsonLoader::LoadLocations(locations_path, logger_);
+
+  const size_t sample_count = std::min(
+      static_cast<size_t>(application_options_.pipeline.location_count),
+      all_locations.size());
+
+  const auto sample_count_signed =
+      static_cast<std::iter_difference_t<decltype(all_locations.cbegin())>>(
+          sample_count);
+
+  std::vector<Location> sampled_locations;
+  sampled_locations.reserve(sample_count);
+
+  std::random_device random_generator;
+  std::ranges::sample(all_locations, std::back_inserter(sampled_locations),
+                      sample_count_signed, random_generator);
+
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::Startup,
+                .message = std::format("  Locations available: {}",
+                                       all_locations.size())});
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::Startup,
+                .message = std::format("  Sampled locations: {}",
+                                       sampled_locations.size())});
+  return sampled_locations;
+}

tooling/pipeline/src/biergarten_pipeline_orchestrator/run.cc

@@ -0,0 +1,63 @@
+/**
+ * @file biergarten_pipeline_orchestrator/run.cc
+ * @brief BiergartenDataGenerator::Run() implementation.
+ */
+
+#include <chrono>
+#include <format>
+#include <utility>
+
+#include "biergarten_pipeline_orchestrator.h"
+#include "services/logging/logger.h"
+
+bool BiergartenPipelineOrchestrator::Run() {
+  try {
+    exporter_->Initialize();
+
+    std::vector<Location> cities = QueryCitiesWithCountries();
+    std::vector<EnrichedCity> enriched;
+    enriched.reserve(cities.size());
+
+    size_t skipped_count = 0;
+    for (auto& city : cities) {
+      try {
+        std::string region_context = context_service_->GetLocationContext(city);
+        // logger_->Log(LogLevel::Debug, PipelinePhase::UserGeneration,
+        //              "[Pipeline] Context for '" + city.city + "' (" +
+        //              city.iso3166_2 + ") gathered:\n" + region_context);
+
+        enriched.push_back(
+            EnrichedCity{.location = std::move(city),
+                         .region_context = std::move(region_context)});
+      } catch (const std::exception& exception) {
+        ++skipped_count;
+        logger_->Log(
+            {.level = LogLevel::Warn,
+             .phase = PipelinePhase::UserGeneration,
+             .message = std::format(
+                 "[Pipeline] Skipping city '{}' ({}): context lookup failed: {}",
+                 city.city, city.country, exception.what())});
+      }
+    }
+
+    if (skipped_count > 0) {
+      logger_->Log({.level = LogLevel::Warn,
+                    .phase = PipelinePhase::UserGeneration,
+                    .message = std::format(
+                        "[Pipeline] Skipped {} city/cities due to context lookup errors",
+                        skipped_count)});
+    }
+
+    this->GenerateBreweries(enriched);
+    exporter_->Finalize();
+    this->LogResults();
+    return true;
+  } catch (const std::exception& e) {
+    logger_->Log(
+        {.level = LogLevel::Error,
+         .phase = PipelinePhase::Teardown,
+         .message =
+             std::format("Pipeline execution failed with error: {}", e.what())});
+    return false;
+  }
+}

tooling/pipeline/src/data_generation/llama/generate_brewery.cc

@@ -4,8 +4,7 @@
  * inference, and validates structured JSON output for brewery records.
  */
 
-#include <spdlog/spdlog.h>
+#include <chrono>
-
 #include <format>
 #include <optional>
 #include <stdexcept>
@@ -100,8 +99,13 @@ BreweryResult LlamaGenerator::GenerateBrewery(
     // Generate brewery data from LLM
     raw = this->Infer(system_prompt, user_prompt, max_tokens,
                       kBreweryJsonGrammar);
-    spdlog::debug("LlamaGenerator: raw output (attempt {}): {}", attempt + 1,
+    if (logger_) {
-                  raw);
+      logger_->Log(
+          {.level = LogLevel::Debug,
+           .phase = PipelinePhase::BreweryAndBeerGeneration,
+           .message = std::format("LlamaGenerator: raw output (attempt {}): {}",
+                      attempt + 1, raw)});
+    }
 
     // Validate output: parse JSON and check required fields
 
@@ -112,9 +116,13 @@ BreweryResult LlamaGenerator::GenerateBrewery(
     if (!validation_error.has_value()) {
       // Success: return parsed brewery data
 
-      spdlog::info(
+      if (logger_) {
-          "LlamaGenerator: successfully generated brewery data on attempt {}",
+        logger_->Log(
-          attempt + 1);
+            {.level = LogLevel::Info,
+             .phase = PipelinePhase::BreweryAndBeerGeneration,
+             .message = std::format("LlamaGenerator: successfully generated brewery data on attempt {}",
+                        attempt + 1)});
+      }
 
       return brewery;
     }
@@ -122,8 +130,14 @@ BreweryResult LlamaGenerator::GenerateBrewery(
     // Validation failed: log error and prepare corrective feedback
 
     last_error = *validation_error;
-    spdlog::warn("LlamaGenerator: malformed brewery JSON (attempt {}): {}",
+    if (logger_) {
-                 attempt + 1, *validation_error);
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::BreweryAndBeerGeneration,
+           .message =
+               std::format("LlamaGenerator: malformed brewery JSON (attempt {}): {}",
+               attempt + 1, *validation_error)});
+    }
 
     // Update prompt with error details to guide LLM toward correct output.
     user_prompt = std::format(
@@ -140,9 +154,13 @@ BreweryResult LlamaGenerator::GenerateBrewery(
   }
 
   // All retry attempts exhausted: log failure and throw exception
-  spdlog::error(
+  if (logger_) {
-      "LlamaGenerator: malformed brewery response after {} attempts: "
+    logger_->Log(
-      "{}",
+        {.level = LogLevel::Error,
-      max_attempts, last_error.empty() ? raw : last_error);
+         .phase = PipelinePhase::BreweryAndBeerGeneration,
+       .message = std::format(
+         "LlamaGenerator: malformed brewery response after {} attempts: {}",
+         max_attempts, last_error.empty() ? raw : last_error)});
+  }
   throw std::runtime_error("LlamaGenerator: malformed brewery response");
 }

tooling/pipeline/src/data_generation/llama/generate_user.cc

@@ -4,9 +4,8 @@
  * retry handling, and output sanitization for downstream parsing.
  */
 
-#include <spdlog/spdlog.h>
 
-#include <stdexcept>
+#include <format>
 #include <string>
 
 #include "data_generation/llama_generator.h"
@@ -21,5 +20,5 @@
 // 4. Return locale-aware username and biography
 UserResult LlamaGenerator::GenerateUser(const std::string& locale) {
   return {.username = "test_user",
-          .bio = "This is a test user profile from " + locale + "."};
+          .bio = std::format("This is a test user profile from {}.", locale)};
 }

tooling/pipeline/src/data_generation/llama/helpers.cc

@@ -16,11 +16,11 @@
 
 #include "data_generation/llama_generator_helpers.h"
 #include "llama.h"
-
+namespace {
 /**
  * String trimming: removes leading and trailing whitespace
  */
-static std::string Trim(std::string_view value) {
+std::string Trim(std::string_view value) {
   constexpr std::string_view whitespace = " \t\n\r\f\v";
   const size_t first_index = value.find_first_not_of(whitespace);
   if (first_index == std::string_view::npos) {
@@ -35,7 +35,7 @@ static std::string Trim(std::string_view value) {
  * Normalize whitespace: collapses multiple spaces/tabs/newlines into single
  * spaces
  */
-static std::string CondenseWhitespace(std::string_view text) {
+std::string CondenseWhitespace(std::string_view text) {
   std::string out;
   out.reserve(text.size());
 
@@ -61,7 +61,37 @@ static std::string CondenseWhitespace(std::string_view text) {
 // Guard against truncating in the first half of the string.
 // This preserves the critical opening content and avoids cutting critical
 // context words early in the region description.
-static constexpr size_t kTruncationGuardDivisor = 2;
+constexpr size_t kTruncationGuardDivisor = 2;
+
+bool ReadRequiredTrimmedStringField(const boost::json::object& obj,
+                                    std::string_view key, std::string& out,
+                                    std::string* error_out) {
+  const boost::json::value* field = obj.if_contains(key);
+  if (field == nullptr || !field->is_string()) {
+    return false;
+  }
+
+  const auto& string_value = field->as_string();
+  out = Trim(std::string_view(string_value.data(), string_value.size()));
+  return !out.empty();
+}
+
+bool HasSchemaPlaceholder(const std::array<std::string*, 4>& values) {
+  for (const std::string* value : values) {
+    std::string lowered = *value;
+    std::ranges::transform(lowered, lowered.begin(),
+                           [](const unsigned char character) {
+                             return static_cast<char>(std::tolower(character));
+                           });
+
+    if (lowered == "string") {
+      return true;
+    }
+  }
+
+  return false;
+}
+}  // namespace
 
 /**
  * Truncate region context to fit within max length while preserving word
@@ -121,47 +151,6 @@ void AppendTokenPiece(const llama_vocab* vocab, llama_token token,
       "LlamaGenerator: failed to decode sampled token piece");
 }
 
-static bool ReadRequiredTrimmedStringField(const boost::json::object& obj,
-                                           std::string_view key,
-                                           std::string& out,
-                                           std::string* error_out) {
-  const boost::json::value* field = obj.if_contains(key);
-  if (field == nullptr || !field->is_string()) {
-    if (error_out != nullptr) {
-      *error_out =
-          "JSON field '" + std::string(key) + "' is missing or not a string";
-    }
-    return false;
-  }
-
-  const auto& string_value = field->as_string();
-  out = Trim(std::string_view(string_value.data(), string_value.size()));
-  if (out.empty()) {
-    if (error_out != nullptr) {
-      *error_out = "JSON field '" + std::string(key) + "' must not be empty";
-    }
-    return false;
-  }
-
-  return true;
-}
-
-static bool HasSchemaPlaceholder(const std::array<std::string*, 4>& values) {
-  for (const std::string* value : values) {
-    std::string lowered = *value;
-    std::ranges::transform(lowered, lowered.begin(),
-                           [](unsigned char character) {
-                             return static_cast<char>(std::tolower(character));
-                           });
-
-    if (lowered == "string") {
-      return true;
-    }
-  }
-
-  return false;
-}
-
 std::optional<std::string> ValidateBreweryJson(const std::string& raw,
                                                BreweryResult& brewery_out) {
   boost::system::error_code error_code;
@@ -209,7 +198,7 @@ std::optional<std::string> ValidateBreweryJson(const std::string& raw,
     return validation_error;
   }
 
-  const std::array<std::string*, 4> schema_placeholders = {
+  const std::array schema_placeholders = {
       &brewery_out.name_en, &brewery_out.description_en,
       &brewery_out.name_local, &brewery_out.description_local};
   if (HasSchemaPlaceholder(schema_placeholders)) {

tooling/pipeline/src/data_generation/llama/infer.cc

@@ -5,9 +5,9 @@
  * output tokens back to text for system+user chat prompts.
  */
 
-#include <spdlog/spdlog.h>
-
 #include <algorithm>
+#include <chrono>
+#include <format>
 #include <memory>
 #include <stdexcept>
 #include <string>
@@ -107,7 +107,7 @@ std::string LlamaGenerator::InferFormatted(const std::string& formatted_prompt,
       .top_p = sampling_top_p_,
       .seed = static_cast<uint32_t>(rng_()),
   };
-  auto sampler = MakeSamplerChain(vocab, sampler_config, grammar);
+  const auto sampler = MakeSamplerChain(vocab, sampler_config, grammar);
 
   /**
    * Clear KV cache to ensure clean inference state (no residual context)
@@ -171,10 +171,14 @@ std::string LlamaGenerator::InferFormatted(const std::string& formatted_prompt,
    */
   prompt_tokens.resize(static_cast<size_t>(token_count));
   if (token_count > prompt_budget) {
-    spdlog::warn(
+    if (logger_) {
-        "LlamaGenerator: prompt too long ({} tokens), truncating to {} "
+      logger_->Log({.level = LogLevel::Warn,
-        "tokens to fit n_batch/n_ctx limits",
+                    .phase = PipelinePhase::BreweryAndBeerGeneration,
-        token_count, prompt_budget);
+                    .message = std::format(
+                        "LlamaGenerator: prompt too long ({} tokens), "
+                        "truncating to {} tokens to fit n_batch/n_ctx limits",
+                        token_count, prompt_budget)});
+    }
     prompt_tokens.resize(static_cast<size_t>(prompt_budget));
     token_count = prompt_budget;
   }

tooling/pipeline/src/data_generation/llama/llama_generator.cc

@@ -32,9 +32,11 @@ void LlamaGenerator::ContextDeleter::operator()(
 
 LlamaGenerator::LlamaGenerator(
     const ApplicationOptions& options, const std::string& model_path,
+    std::shared_ptr<ILogger> logger,
     std::unique_ptr<IPromptFormatter> prompt_formatter,
     std::unique_ptr<IPromptDirectory> prompt_directory)
     : rng_(std::random_device{}()),
+      logger_(std::move(logger)),
       prompt_formatter_(std::move(prompt_formatter)),
       prompt_directory_(std::move(prompt_directory)) {
   if (model_path.empty()) {

tooling/pipeline/src/data_generation/llama/load.cc

@@ -4,9 +4,8 @@
  * context, and resets prior resources during model initialization.
  */
 
-#include <spdlog/spdlog.h>
-
 #include <algorithm>
+#include <chrono>
 #include <stdexcept>
 #include <string>
 #include <utility>
@@ -29,8 +28,10 @@ void LlamaGenerator::Load(const std::string& model_path) {
 
   llama_model_params model_params = llama_model_default_params();
   model_params.n_gpu_layers = n_gpu_layers_;
-  LlamaGenerator::ModelHandle loaded_model(
+
+  ModelHandle loaded_model(
       llama_model_load_from_file(model_path.c_str(), model_params));
+
   if (!loaded_model) {
     throw std::runtime_error(
         "LlamaGenerator: failed to load model from path: " + model_path);
@@ -40,8 +41,9 @@ void LlamaGenerator::Load(const std::string& model_path) {
   context_params.n_ctx = n_ctx_;
   context_params.n_batch = std::min(n_ctx_, kMaxBatchSize);
 
-  LlamaGenerator::ContextHandle loaded_context(
+  ContextHandle loaded_context(
       llama_init_from_model(loaded_model.get(), context_params));
+
   if (!loaded_context) {
     throw std::runtime_error("LlamaGenerator: failed to create context");
   }
@@ -49,5 +51,10 @@ void LlamaGenerator::Load(const std::string& model_path) {
   model_ = std::move(loaded_model);
   context_ = std::move(loaded_context);
 
-  spdlog::info("[LlamaGenerator] Loaded model: {}", model_path);
+  if (logger_) {
+    logger_->Log({.level = LogLevel::Info,
+                  .phase = PipelinePhase::Startup,
+                  .message = std::format("[LlamaGenerator] Loaded model: {} ",
+                                         model_path)});
+  }
 }

tooling/pipeline/src/json_handling/json_loader.cc

@@ -6,7 +6,9 @@
 
 #include "json_handling/json_loader.h"
 
-#include <spdlog/spdlog.h>
+#include <format>
+#include "services/logging/logger.h"
+#include <iostream>
 
 #include <boost/json.hpp>
 #include <fstream>
@@ -19,8 +21,8 @@ static std::string ReadRequiredString(const boost::json::object& object,
                                       const char* key) {
   const boost::json::value* value = object.if_contains(key);
   if (value == nullptr || !value->is_string()) {
-    throw std::runtime_error(std::string("Missing or invalid string field: ") +
+    throw std::runtime_error(
-                             key);
+        std::format("Missing or invalid string field: {}", key));
   }
   const std::string_view text = value->as_string();
   return std::string(text);
@@ -30,8 +32,8 @@ static double ReadRequiredNumber(const boost::json::object& object,
                                  const char* key) {
   const boost::json::value* value = object.if_contains(key);
   if (value == nullptr || !value->is_number()) {
-    throw std::runtime_error(std::string("Missing or invalid numeric field: ") +
+    throw std::runtime_error(
-                             key);
+        std::format("Missing or invalid numeric field: {}", key));
   }
   return value->to_number<double>();
 }
@@ -41,7 +43,7 @@ static std::vector<std::string> ReadRequiredStringArray(
   const boost::json::value* value = object.if_contains(key);
   if (value == nullptr || !value->is_array()) {
     throw std::runtime_error(
-        std::string("Missing or invalid string array field: ") + key);
+      std::format("Missing or invalid string array field: {}", key));
   }
 
   const auto& array = value->as_array();
@@ -50,7 +52,7 @@ static std::vector<std::string> ReadRequiredStringArray(
   for (const auto& item : array) {
     if (!item.is_string()) {
       throw std::runtime_error(
-          std::string("Missing or invalid string array field: ") + key);
+          std::format("Missing or invalid string array field: {}", key));
     }
     items.emplace_back(item.as_string());
   }
@@ -58,7 +60,7 @@ static std::vector<std::string> ReadRequiredStringArray(
 }
 
 std::vector<Location> JsonLoader::LoadLocations(
-    const std::filesystem::path& filepath) {
+    const std::filesystem::path& filepath, std::shared_ptr<ILogger> logger) {
   std::ifstream input(filepath);
   if (!input.is_open()) {
     throw std::runtime_error("Failed to open locations file: " +
@@ -104,7 +106,5 @@ std::vector<Location> JsonLoader::LoadLocations(
     });
   }
 
-  spdlog::info("[JsonLoader] Loaded {} locations from {}", locations.size(),
-               filepath.string());
   return locations;
 }

tooling/pipeline/src/main.cc

@@ -4,16 +4,22 @@
  * initializes shared infrastructure, and executes the pipeline entry flow.
  */
 
+#include <spdlog/fmt/fmt.h>
 #include <spdlog/spdlog.h>
 
 #include <boost/di.hpp>
 #include <boost/program_options.hpp>
+#include <chrono>
 #include <exception>
+#include <format>
+#include <iostream>
 #include <memory>
 #include <optional>
 #include <string>
+#include <thread>
 
-#include "biergarten_data_generator.h"
+#include "biergarten_pipeline_orchestrator.h"
+#include "concurrency/bounded_channel.h"
 #include "data_generation/llama_generator.h"
 #include "data_generation/mock_generator.h"
 #include "data_generation/prompt_formatting/gemma4_jinja_prompt_formatter.h"
@@ -25,28 +31,50 @@
 #include "services/enrichment/enrichment_service.h"
 #include "services/enrichment/mock_enrichment.h"
 #include "services/enrichment/wikipedia_service.h"
+#include "services/logging/log_dispatcher.h"
+#include "services/logging/log_entry.h"
+#include "services/logging/log_producer.h"
+#include "services/logging/logger.h"
 #include "services/prompting/prompt_directory.h"
 #include "web_client/http_web_client.h"
 
 namespace di = boost::di;
 
+static constexpr size_t kLogMaxCount = 512;
+
 int main(const int argc, char** argv) {
+  spdlog::set_level(spdlog::level::debug);
+  spdlog::set_pattern("│ %Y-%m-%d %H:%M:%S.%e │ %^%-7l%$ │ %v");
+  BoundedChannel<LogEntry> log_channel(kLogMaxCount);
+
+  auto log_dispatcher =  //
+      std::make_unique<LogDispatcher>(log_channel);
+  std::shared_ptr<ILogger> log_producer =
+      std::make_shared<LogProducer>(log_channel);
+
+  std::thread log_thread([&log_dispatcher] { log_dispatcher->Run(); });
+  auto shutdown = [&](const int exit_code) {
+    log_channel.Close();
+    log_thread.join();
+    return exit_code;
+  };
+
   try {
     Timer timer;
-    spdlog::set_pattern("[%Y-%m-%d %H:%M:%S.%e] [%^%l%$] %v");
 
 #ifndef BIERGARTEN_MOCK_ONLY
     const LlamaBackendState llama_backend_state;
 #endif
-#ifdef DEBUG
+
-    spdlog::set_level(spdlog::level::debug);
+    log_producer->Log({.level   = LogLevel::Info,
-#endif
+                       .phase   = PipelinePhase::Startup,
+                       .message = "STARTING PIPELINE"});
 
     const std::optional<ApplicationOptions> parsed_options =
-        ParseArguments(argc, argv);
+        ParseArguments(argc, argv, log_producer);
 
     if (!parsed_options.has_value()) {
-      return 0;
+      return shutdown(EXIT_FAILURE);
     }
 
     const auto options = *parsed_options;
@@ -55,65 +83,136 @@ int main(const int argc, char** argv) {
         options.generator.sampling.value_or(SamplingOptions{});
 
     std::unique_ptr<IPromptDirectory> prompt_directory;
+
     if (!options.generator.use_mocked) {
       try {
-        prompt_directory =
+        prompt_directory = std::make_unique<PromptDirectory>(
-            std::make_unique<PromptDirectory>(options.pipeline.prompt_dir);
+            options.pipeline.prompt_dir, log_producer);
       } catch (const std::exception& dir_error) {
-        spdlog::error("[Startup] Invalid --prompt-dir: {}", dir_error.what());
+        log_producer->Log({.level   = LogLevel::Error,
-        return 1;
+                           .phase   = PipelinePhase::Startup,
+                           .message = std::format("Invalid --prompt-dir: {}",
+                                                  dir_error.what())});
+
+        return shutdown(EXIT_FAILURE);
       }
     }
 
     const auto injector = di::make_injector(
+        di::bind<ILogger>().to(log_producer),
         di::bind<ApplicationOptions>().to(options),
         di::bind<std::string>().to(model_path),
-        di::bind<WebClient>().to<HttpWebClient>(),
         di::bind<IExportService>().to<SqliteExportService>(),
-        di::bind<IPromptFormatter>().to<Gemma4JinjaPromptFormatter>(),
+        di::bind<IPromptFormatter>().to([options, log_producer] {
+          if (options.generator.use_mocked) {
+            {
+              log_producer->Log(
+                  {.level = LogLevel::Info,
+                   .phase   = PipelinePhase::Startup,
+                   .message = "Prompt formatter: none (mock mode)"});
+            }
+            return std::unique_ptr<IPromptFormatter>(nullptr);
+          }
+          {
+            log_producer->Log(
+                {.level = LogLevel::Info,
+                 .phase   = PipelinePhase::Startup,
+                 .message = "Prompt formatter: Gemma4JinjaPromptFormatter"});
+          }
+          return std::unique_ptr<IPromptFormatter>(
+              std::make_unique<Gemma4JinjaPromptFormatter>());
+        }),
+        di::bind<WebClient>().to([options, log_producer] {
+          if (options.generator.use_mocked) {
+            {
+              log_producer->Log({.level   = LogLevel::Info,
+                                 .phase   = PipelinePhase::Startup,
+                                 .message = "Web client: none (mock mode)"});
+            }
+            return std::unique_ptr<WebClient>(nullptr);
+          }
+          {
+            log_producer->Log({.level   = LogLevel::Info,
+                               .phase   = PipelinePhase::Startup,
+                               .message = "Web client: HttpWebClient"});
+          }
+          return std::unique_ptr<WebClient>(
+              std::make_unique<HttpWebClient>(log_producer));
+        }),
         di::bind<IEnrichmentService>().to(
-            [options](const auto& inj) -> std::unique_ptr<IEnrichmentService> {
+            [options, &log_producer](
+                const auto& inj) -> std::unique_ptr<IEnrichmentService> {
               if (options.generator.use_mocked) {
+                {
+                  log_producer->Log({.level   = LogLevel::Info,
+                                     .phase   = PipelinePhase::Startup,
+                                     .message = "Enrichment: mock"});
+                }
                 return std::make_unique<MockEnrichmentService>();
               }
-
+              {
+                log_producer->Log({.level   = LogLevel::Info,
+                                   .phase   = PipelinePhase::Startup,
+                                   .message = "Enrichment: Wikipedia"});
+              }
               return std::make_unique<WikipediaEnrichmentService>(
-                  inj.template create<std::unique_ptr<WebClient>>());
+                  inj.template create<std::unique_ptr<WebClient>>(),
+                  log_producer);
             }),
         di::bind<DataGenerator>().to(
-            [options, model_path, sampling, &prompt_directory](
+            [&options, &model_path, &sampling, &prompt_directory,
-                const auto& inj) -> std::unique_ptr<DataGenerator> {
+             &log_producer](const auto& inj) -> std::unique_ptr<DataGenerator> {
               if (options.generator.use_mocked) {
-                spdlog::info(
+                {
-                    "[Generator] Using MockGenerator (no model path provided)");
+                  log_producer->Log({.level   = LogLevel::Info,
+                                     .phase   = PipelinePhase::Startup,
+                                     .message = "Generator: mock"});
+                }
                 return std::make_unique<MockGenerator>();
               }
-
+              {
-              spdlog::info(
+                log_producer->Log(
-                  "[Generator] Using LlamaGenerator: {} (temperature={}, "
+                    {.level = LogLevel::Info,
-                  "top-p={}, top-k={}, n_ctx={}, seed={})",
+                     .phase   = PipelinePhase::Startup,
-                  model_path, sampling.temperature, sampling.top_p,
+                     .message = std::format(
-                  sampling.top_k, sampling.n_ctx, sampling.seed);
+                         "Generator: LlamaGenerator | model={} | temp={:.2f} "
+                         "top_p={:.2f} top_k={} n_ctx={} seed={}",
+                         model_path, sampling.temperature, sampling.top_p,
+                         sampling.top_k, sampling.n_ctx, sampling.seed)});
+              }
               return std::make_unique<LlamaGenerator>(
-                  options, model_path,
+                  options, model_path, log_producer,
                   inj.template create<std::unique_ptr<IPromptFormatter>>(),
                   std::move(prompt_directory));
-            })
+            }));
 
-    );
+    const auto orchestrator =
+        injector.create<std::unique_ptr<BiergartenPipelineOrchestrator>>();
 
-    const auto generator =
+    if (!orchestrator->Run()) {
-        injector.create<std::unique_ptr<BiergartenDataGenerator>>();
+      log_producer->Log({.level   = LogLevel::Error,
-
+                         .phase   = PipelinePhase::Teardown,
-    if (!generator->Run()) {
+                         .message = "Pipeline execution failed"});
-      spdlog::error("Pipeline execution failed");
+      return shutdown(EXIT_FAILURE);
-      return 1;
     }
 
-    spdlog::info("Pipeline executed successfully in {} ms", timer.Elapsed());
+    log_producer->Log({.level   = LogLevel::Info,
-    return 0;
+                       .phase   = PipelinePhase::Teardown,
+                       .message = std::format("Pipeline complete in {} ms",
+                                              timer.Elapsed())});
+
+    return shutdown(EXIT_SUCCESS);
+
   } catch (const std::exception& exception) {
-    spdlog::critical("Unhandled fatal error in main: {}", exception.what());
+    const LogDTO log_entry{.level = LogLevel::Error,
-    return 1;
+                               .phase   = PipelinePhase::Teardown,
+                               .message = exception.what()};
+    if (log_producer) {
+      log_producer->Log(log_entry);
+    } else {
+      std::cerr << log_entry.message << std::endl;
+    }
+
+    return shutdown(EXIT_FAILURE);
   }
 }

tooling/pipeline/src/services/enrichment/wikipedia/fetch_extract.cc

@@ -2,8 +2,6 @@
  * @file wikipedia/fetch_extract.cc
  */
 
-#include <spdlog/spdlog.h>
-
 #include <boost/json.hpp>
 #include <chrono>
 #include <format>
@@ -16,13 +14,16 @@
 using namespace boost;
 
 std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
-
   const std::string cache_key(query);
 
   // 1. Cache Lookup
   if (const auto cache_it = this->extract_cache_.find(cache_key);
       cache_it != this->extract_cache_.end()) {
-    spdlog::debug("Wikipedia: Cache hit for {}!", cache_key);
+    if (logger_) {
+      logger_->Log({.level = LogLevel::Debug,
+                    .phase = PipelinePhase::UserGeneration,
+                    .message = std::format("Wikipedia: Cache hit for {}!", cache_key)});
+    }
     return cache_it->second;
   }
 
@@ -32,7 +33,6 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
       "api.php?action=query&titles={}&prop=extracts&explaintext=1&format=json",
       encoded);
 
-
   const std::string body = this->client_->Get(url);
   {
     using namespace std::literals::chrono_literals;
@@ -44,15 +44,27 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
   json::value doc = json::parse(body, ec);
 
   if (ec) {
-    spdlog::warn("WikipediaService: JSON parse error for '{}': {}", query,
+    if (logger_) {
-                 ec.message());
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format("WikipediaService: JSON parse error for '{}': {}",
+                      std::string(query), ec.message())});
+    }
     return {};
   }
 
   // 3. Safe Extraction
   const json::object* obj = doc.if_object();
   if (obj == nullptr) {
-    spdlog::warn("WikipediaService: Expected root object for '{}'", query);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message =
+               std::format("WikipediaService: Expected root object for '{}'",
+               std::string(query))});
+    }
     return {};
   }
 
@@ -63,14 +75,27 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
           : nullptr;
 
   if ((pages_ptr == nullptr) || !pages_ptr->is_object()) {
-    spdlog::warn("WikipediaService: Missing query.pages for '{}'", query);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message =
+               std::format("WikipediaService: Missing query.pages for '{}'",
+               std::string(query))});
+    }
     return {};
   }
 
   const json::object& pages = pages_ptr->get_object();
 
   if (pages.empty()) {
-    spdlog::warn("WikipediaService: No pages returned for '{}'", query);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format("WikipediaService: No pages returned for '{}'",
+                      std::string(query))});
+    }
     this->extract_cache_.emplace(cache_key, "");
     return {};
   }
@@ -80,7 +105,14 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
   const json::value& page_val = pages.begin()->value();
 
   if (!page_val.is_object()) {
-    spdlog::warn("WikipediaService: Unexpected page format for '{}'", query);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message =
+               std::format("WikipediaService: Unexpected page format for '{}'",
+               std::string(query))});
+    }
     return {};
   }
 
@@ -88,7 +120,12 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
 
   // Handle 404/Missing status
   if (page.contains("missing")) {
-    spdlog::warn("WikipediaService: Page '{}' does not exist", query);
+    if (logger_) {
+      logger_->Log({.level = LogLevel::Warn,
+                    .phase = PipelinePhase::UserGeneration,
+                    .message = std::format("WikipediaService: Page '{}' does not exist",
+                               std::string(query))});
+    }
     this->extract_cache_.emplace(cache_key, "");
     return {};
   }
@@ -96,17 +133,28 @@ std::string WikipediaEnrichmentService::FetchExtract(std::string_view query) {
   const json::value* extract_ptr = page.if_contains("extract");
 
   if ((extract_ptr == nullptr) || !extract_ptr->is_string()) {
-    spdlog::warn("WikipediaService: No extract string found for '{}'", query);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message =
+               std::format("WikipediaService: No extract string found for '{}'",
+               std::string(query))});
+    }
     this->extract_cache_.emplace(cache_key, "");
     return {};
   }
 
   // 4. Success
   std::string extract(extract_ptr->as_string());
-  spdlog::info("WikipediaService: Fetched {} chars for '{}'", extract.size(),
+  if (logger_) {
-                query);
+    logger_->Log({.level = LogLevel::Info,
+                  .phase = PipelinePhase::UserGeneration,
+                  .message = std::format("WikipediaService: Fetched {} chars for '{}'",
+                             extract.size(), std::string(query))});
+  }
 
   this->extract_cache_.insert_or_assign(cache_key, extract);
 
   return extract;
-}
+}

tooling/pipeline/src/services/enrichment/wikipedia/get_summary.cc

@@ -3,8 +3,6 @@
  * @brief WikipediaService::GetLocationContext() implementation.
  */
 
-#include <spdlog/spdlog.h>
-
 #include <chrono>
 #include <format>
 #include <string>
@@ -12,10 +10,15 @@
 
 #include "services/enrichment/wikipedia_service.h"
 
-std::string WikipediaEnrichmentService::GetLocationContext(const Location& loc) {
+std::string WikipediaEnrichmentService::GetLocationContext(
+    const Location& loc) {
   using namespace std::literals::chrono_literals;
   if (!this->client_) {
-    spdlog::warn("Client is nullptr.");
+    if (logger_) {
+      logger_->Log({.level = LogLevel::Warn,
+                    .phase = PipelinePhase::UserGeneration,
+                    .message = "Wikipedia client is nullptr."});
+    }
     return {};
   }
 
@@ -46,13 +49,22 @@ std::string WikipediaEnrichmentService::GetLocationContext(const Location& loc)
   try {
     append_extract(FetchExtract(brewing_query));
     append_extract(FetchExtract(beer_query));
-    spdlog::info("Done fetching for {}. Sleeping for 10 seconds.",
+    if (logger_) {
-                 location_query);
+      logger_->Log({.level = LogLevel::Info,
+                    .phase = PipelinePhase::UserGeneration,
+                    .message = std::format("Done fetching for {}. Sleeping for 10 seconds.",
+                               location_query)});
+    }
     std::this_thread::sleep_for(10s);
 
   } catch (const std::runtime_error& e) {
-    spdlog::debug("WikipediaService lookup failed for '{}': {}", location_query,
+    if (logger_) {
-                  e.what());
+      logger_->Log(
+          {.level = LogLevel::Debug,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format("WikipediaService lookup failed for '{}': {}",
+                      location_query, e.what())});
+    }
   }
   return result;
 }

tooling/pipeline/src/services/enrichment/wikipedia/wikipedia_service.cc

@@ -8,5 +8,5 @@
 #include <utility>
 
 WikipediaEnrichmentService::WikipediaEnrichmentService(
-    std::unique_ptr<WebClient> client)
+    std::unique_ptr<WebClient> client, std::shared_ptr<ILogger> logger)
-    : client_(std::move(client)) {}
+    : client_(std::move(client)), logger_(std::move(logger)) {}

tooling/pipeline/src/services/logging/log_dispatcher.cc

@@ -0,0 +1,74 @@
+/**
+ * @brief LogDispatcher implementation for asynchronous pipeline logging.
+ *
+ * LogDispatcher drains LogEntry items from a BoundedChannel and forwards them
+ * to spdlog for final output.
+ */
+#include "services/logging/log_dispatcher.h"
+
+#include <spdlog/spdlog.h>
+
+#include <string>
+
+#include "concurrency/bounded_channel.h"
+#include "services/logging/log_entry.h"
+
+namespace {
+[[nodiscard]] constexpr std::string_view PipelinePhaseToString(
+    PipelinePhase phase) {
+  switch (phase) {
+    case PipelinePhase::Startup:
+      return "Startup";
+    case PipelinePhase::UserGeneration:
+      return "User Generation";
+    case PipelinePhase::BreweryAndBeerGeneration:
+      return "Brewery & Beer Gen";
+    case PipelinePhase::CheckinGeneration:
+      return "Checkin Gen";
+    case PipelinePhase::RatingGeneration:
+      return "Rating Gen";
+    case PipelinePhase::FollowGeneration:
+      return "Follow Gen";
+    case PipelinePhase::Teardown:
+      return "Teardown";
+  }
+  return "Unknown";
+}
+}  // namespace
+
+LogDispatcher::LogDispatcher(BoundedChannel<LogEntry>& channel)
+    : channel_(channel) {}
+
+void LogDispatcher::Run() {
+  auto logger = spdlog::default_logger();
+
+  while (true) {
+    auto entry = channel_.Receive();
+    if (!entry.has_value()) {
+      // Channel is closed and drained.
+      break;
+    }
+
+    const auto& log = entry.value();
+
+    logger->log(ToSpdlogLevel(log.level),
+                "{:<20} │ thread: {:016x} │ [{}:{}] │ {}",
+                PipelinePhaseToString(log.phase),
+                std::hash<std::thread::id>{}(log.thread_id),
+                log.origin.file_name(), log.origin.line(), log.message);
+  }
+}
+
+spdlog::level::level_enum LogDispatcher::ToSpdlogLevel(LogLevel level) {
+  switch (level) {
+    case LogLevel::Debug:
+      return spdlog::level::debug;
+    case LogLevel::Info:
+      return spdlog::level::info;
+    case LogLevel::Warn:
+      return spdlog::level::warn;
+    case LogLevel::Error:
+      return spdlog::level::err;
+  }
+  return spdlog::level::info;
+}

tooling/pipeline/src/services/logging/log_producer.cc

@@ -0,0 +1,19 @@
+/**
+ * @file src/services/logging/log_producer.cc
+ * @brief LogProducer implementation for asynchronous pipeline logging.
+ */
+
+#include "services/logging/log_producer.h"
+
+#include <chrono>
+#include <optional>
+#include <string>
+#include <string_view>
+
+#include "concurrency/bounded_channel.h"
+#include "services/logging/log_entry.h"
+
+LogProducer::LogProducer(BoundedChannel<LogEntry>& channel)
+    : channel_(channel) {}
+
+void LogProducer::DoLog(LogEntry entry) { channel_.Send(std::move(entry)); }

tooling/pipeline/src/services/prompt_directory.cc

@@ -6,20 +6,25 @@
 
 #include "services/prompting/prompt_directory.h"
 
-#include <spdlog/spdlog.h>
+#include <chrono>
-
 #include <filesystem>
+#include <format>
 #include <fstream>
 #include <stdexcept>
 #include <string>
 #include <string_view>
+#include <utility>
 
 // ---------------------------------------------------------------------------
 // PromptDirectory
 // ---------------------------------------------------------------------------
 
 PromptDirectory::PromptDirectory(const std::filesystem::path& prompt_dir)
-    : prompt_dir_(prompt_dir) {
+    : PromptDirectory(prompt_dir, nullptr) {}
+
+PromptDirectory::PromptDirectory(const std::filesystem::path& prompt_dir,
+                                 std::shared_ptr<ILogger> logger)
+    : prompt_dir_(prompt_dir), logger_(std::move(logger)) {
   std::error_code ec;
 
   // Scenario 4: directory must exist.
@@ -40,12 +45,18 @@ PromptDirectory::PromptDirectory(const std::filesystem::path& prompt_dir)
   std::filesystem::directory_iterator probe(prompt_dir_, ec);
   if (ec) {
     throw std::runtime_error(
-        "PromptDirectory: prompt directory is not readable: " +
+        std::format("PromptDirectory: prompt directory is not readable: {} ({})",
-        prompt_dir_.string() + " (" + ec.message() + ")");
+        prompt_dir_.string(), ec.message()));
   }
 
-  spdlog::info("[PromptDirectory] Resolved prompt directory: {}",
+  if (logger_) {
-               prompt_dir_.string());
+    logger_->Log(
+        {.level = LogLevel::Info,
+         .phase = PipelinePhase::Startup,
+         .message =
+             std::string("[PromptDirectory] Resolved prompt directory: ") +
+             prompt_dir_.string()});
+  }
 }
 
 std::string PromptDirectory::Load(std::string_view key) {
@@ -59,13 +70,13 @@ std::string PromptDirectory::Load(std::string_view key) {
 
   // Scenario 3: resolve <prompt_dir>/<key>.md and require it to exist.
   const std::filesystem::path file_path =
-      prompt_dir_ / std::filesystem::path(key_str + ".md");
+      prompt_dir_ / std::filesystem::path(std::format("{}.md", key_str));
 
   std::ifstream file(file_path);
   if (!file.is_open()) {
     throw std::runtime_error(
-        "PromptDirectory: prompt file not found for key '" + key_str +
+        std::format("PromptDirectory: prompt file not found for key '{}': {}",
-        "': " + file_path.string());
+        key_str, file_path.string()));
   }
 
   std::string content((std::istreambuf_iterator<char>(file)),
@@ -73,12 +84,16 @@ std::string PromptDirectory::Load(std::string_view key) {
   file.close();
 
   if (content.empty()) {
-    throw std::runtime_error("PromptDirectory: prompt file for key '" +
+    throw std::runtime_error(std::format("PromptDirectory: prompt file for key '{}' is empty: {}",
-                             key_str + "' is empty: " + file_path.string());
+                             key_str, file_path.string()));
   }
 
-  spdlog::info("[PromptDirectory] Loaded prompt '{}' from '{}' ({} chars)",
+  if (logger_) {
-               key_str, file_path.string(), content.size());
+    logger_->Log({.level = LogLevel::Info,
+                  .phase = PipelinePhase::Startup,
+                  .message = std::format("[PromptDirectory] Loaded prompt '{}' from '{}' ({} chars)",
+                             key_str, file_path.string(), content.size())});
+  }
 
   cache_.emplace(key_str, content);
   return content;

tooling/pipeline/src/services/sqlite/helpers/sqlite_connection_helpers.cc

@@ -1,5 +1,6 @@
 #include "services/database/sqlite_connection_helpers.h"
 
+#include <format>
 #include <stdexcept>
 
 namespace sqlite_export_service_internal {
@@ -20,7 +21,7 @@ void SqliteStatementDeleter::operator()(
 void ThrowSqliteError(sqlite3* db_handle, std::string_view action) {
   const std::string message =
       db_handle != nullptr ? sqlite3_errmsg(db_handle) : "unknown SQLite error";
-  throw std::runtime_error(std::string(action) + ": " + message);
+  throw std::runtime_error(std::format("{}: {}", action, message));
 }
 
 SqliteDatabaseHandle OpenDatabase(const std::filesystem::path& path) {
@@ -50,7 +51,7 @@ void ExecSql(const SqliteDatabaseHandle& db_handle, std::string_view sql,
                                     ? error_message
                                     : sqlite3_errmsg(db_handle.get());
     sqlite3_free(error_message);
-    throw std::runtime_error(std::string(action) + ": " + message);
+    throw std::runtime_error(std::format("{}: {}", action, message));
   }
 }
 

tooling/pipeline/src/services/sqlite/initialize.cc

@@ -4,6 +4,7 @@
  */
 
 #include <filesystem>
+#include <format>
 #include <memory>
 #include <stdexcept>
 #include <string>
@@ -18,8 +19,8 @@ std::filesystem::path SqliteExportService::BuildDatabasePath() const {
 
   for (int suffix = 1; std::filesystem::exists(candidate); ++suffix) {
     candidate = output_path_ /
-                std::filesystem::path("biergarten_seed_" + run_timestamp_utc_ +
+                std::filesystem::path(std::format("biergarten_seed_{}-{}.sqlite",
-                                      "-" + std::to_string(suffix) + ".sqlite");
+                                      run_timestamp_utc_, suffix));
   }
 
   return candidate;

tooling/pipeline/src/web_client/http_web_client.cc

@@ -1,5 +1,5 @@
 /**
-* @file web_client/http_web_client.cc
+ * @file web_client/http_web_client.cc
  * @brief cpp-httplib implementation of WebClient.
  */
 
@@ -7,12 +7,14 @@
 
 #include <httplib.h>
 
+#include <chrono>
+#include <format>
 #include <regex>
 #include <stdexcept>
 #include <string>
 #include <utility>
 
-#include "spdlog/spdlog.h"
+#include "services/logging/logger.h"
 
 namespace {
 constexpr time_t kConnectionTimeoutSeconds = 5;
@@ -31,7 +33,7 @@ std::pair<std::string, std::string> SplitUrl(const std::string& url) {
 
   return {match[1].str(), match[2].matched ? match[2].str() : "/"};
 }
-} // namespace
+}  // namespace
 
 std::string HttpWebClient::Get(const std::string& url) {
   const auto [origin, path] = SplitUrl(url);
@@ -40,24 +42,27 @@ std::string HttpWebClient::Get(const std::string& url) {
   client.set_follow_location(true);
   client.set_connection_timeout(kConnectionTimeoutSeconds);
   client.set_read_timeout(kReadTimeoutSeconds);
-  client.set_default_headers({
+  client.set_default_headers({{"Accept", "application/json"},
-     {"Accept", "application/json"},
+                              {"User-Agent", "biergarten-pipeline/1.0"}});
-     {"User-Agent", "biergarten-pipeline/1.0"}
- });
 
   const httplib::Result result = client.Get(path);
 
   if (!result) {
-    throw std::runtime_error(
+    throw std::runtime_error(std::format(
-        "[HttpWebClient] Request failed for URL: " + url +
+        "[HttpWebClient] Request failed for URL: {} — {}", url,
-        " — " + httplib::to_string(result.error()));
+        httplib::to_string(result.error())));
   }
 
   if (result->status < kSuccessMin || result->status >= kSuccessMax) {
-    spdlog::error("[HttpWebClient] Request failed for URL: " + url);
+    if (logger_) {
-    throw std::runtime_error(
+      logger_->Log(
-        "[HttpWebClient] HTTP " + std::to_string(result->status) +
+          {.level = LogLevel::Error,
-        " for URL: " + url);
+           .phase = PipelinePhase::UserGeneration,
+         .message =
+           std::format("[HttpWebClient] Request failed for URL: {}", url)});
+    }
+    throw std::runtime_error(std::format("[HttpWebClient] HTTP {} for URL: {}",
+                       result->status, url));
   }
 
   return result->body;
@@ -65,4 +70,4 @@ std::string HttpWebClient::Get(const std::string& url) {
 
 std::string HttpWebClient::EncodeURL(const std::string& value) {
   return httplib::encode_uri_component(value);
-}
+}