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docs/pipeline/diagrams-md/current/class.md

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+# The Biergarten Data Pipeline — Class Diagram (Current)
+
+```mermaid
+classDiagram
+    class BiergartenPipelineOrchestrator {
+        -shared_ptr~ILogger~ logger_
+        -unique_ptr~IEnrichmentService~ context_service_
+        -unique_ptr~DataGenerator~ generator_
+        -unique_ptr~IExportService~ exporter_
+        -unique_ptr~ICuratedDataService~ curated_data_service_
+        -ApplicationOptions application_options_
+        -vector~BreweryRecord~ generated_breweries_
+        -vector~UserRecord~ generated_users_
+        +Run() bool
+        -QueryLocations() vector~City~
+        -GenerateBreweries(cities) void
+        -GenerateUsers(cities) void
+        -LogResults() void
+    }
+    note for BiergartenPipelineOrchestrator "GenerateBreweries/GenerateUsers jitter each address via GetRandomCoordsWithinRange(), uniformly within 5km of the city centre"
+
+    class LogLevel {
+        <<enumeration>>
+        Debug
+        Info
+        Warn
+        Error
+    }
+
+    class PipelinePhase {
+        <<enumeration>>
+        Startup
+        Enrichment
+        UserGeneration
+        BreweryAndBeerGeneration
+        CheckinGeneration
+        RatingGeneration
+        FollowGeneration
+        Teardown
+    }
+
+    class LogDTO {
+        <<struct>>
+        +LogLevel level
+        +PipelinePhase phase
+        +string message
+    }
+
+    class LogEntry {
+        <<struct>>
+        +time_point timestamp
+        +source_location origin
+        +thread::id thread_id
+        +LogLevel level
+        +PipelinePhase phase
+        +string message
+    }
+
+    class ILogger {
+        <<interface>>
+        +Log(payload) void
+        -DoLog(entry)* void
+    }
+
+    class LogProducer {
+        -BoundedChannel~LogEntry~ channel_
+        -DoLog(entry) void
+    }
+
+    class LogDispatcher {
+        -BoundedChannel~LogEntry~ channel_
+        +Run() void
+        -ToSpdlogLevel(level) level_enum
+    }
+
+    class IEnrichmentService {
+        <<interface>>
+        +GetLocationContext(loc) string
+    }
+
+    class MockEnrichmentService {
+        +GetLocationContext(loc) string
+    }
+
+    class WikipediaEnrichmentService {
+        -unique_ptr~WebClient~ client_
+        -unordered_map~string, string~ extract_cache_
+        +GetLocationContext(loc) string
+        -FetchExtract(query) string
+    }
+
+    class WebClient {
+        <<interface>>
+        +Get(url) string
+        +UrlEncode(value) string
+    }
+
+    class HttpWebClient {
+        +Get(url) string
+        +UrlEncode(value) string
+    }
+
+    class DataGenerator {
+        <<interface>>
+        +GenerateBrewery(city) BreweryResult
+        +GenerateUser(city, persona, name) UserResult
+    }
+
+    class MockGenerator {
+        +GenerateBrewery(city) BreweryResult
+        +GenerateUser(city, persona, name) UserResult
+        -DeterministicHash(location) size_t
+        -DeterministicHash(location, persona, name) size_t
+    }
+
+    class LlamaGenerator {
+        -ModelHandle model_
+        -ContextHandle context_
+        -unique_ptr~IPromptFormatter~ prompt_formatter_
+        -unique_ptr~IPromptDirectory~ prompt_directory_
+        -mt19937 rng_
+        +GenerateBrewery(...) BreweryResult
+        +GenerateUser(...) UserResult
+        -Load(model_path) void
+        -Infer(...) string
+        -InferFormatted(...) string
+    }
+
+    class OpenAIGenerator {
+        -string api_key_
+        -string model_
+        -shared_ptr~ILogger~ logger_
+        -unique_ptr~IPromptDirectory~ prompt_directory_
+        -unique_ptr~WebClient~ web_client_
+        +GenerateBrewery(city) BreweryResult
+        +GenerateUser(city, persona, name) UserResult
+        -CallChatCompletionsApi(...) string
+    }
+    note for OpenAIGenerator "Chat Completions with Structured Outputs (json_schema, strict) guarantees schema-valid JSON, replacing llama.cpp's GBNF grammar — no IPromptFormatter needed"
+
+    class IPromptFormatter {
+        <<interface>>
+        +Format(system_prompt, user_prompt) string
+    }
+
+    class Gemma4JinjaPromptFormatter {
+        +Format(system_prompt, user_prompt) string
+    }
+
+    class IPromptDirectory {
+        <<interface>>
+        +Load(key) string
+    }
+
+    class PromptDirectory {
+        -path prompt_dir_
+        -unordered_map~string, string~ cache_
+        +Load(key) string
+    }
+
+    class ICuratedDataService {
+        <<interface>>
+        +LoadLocations(filepath) vector~Location~
+        +LoadPersonas(filepath) vector~UserPersona~
+        +LoadForenamesByCountry(filepath) unordered_map~string, forename_list~
+        +LoadSurnamesByCountry(filepath) unordered_map~string, surname_list~
+    }
+
+    class JsonLoader {
+        -cache cache_
+        +LoadLocations(filepath) vector~Location~
+        +LoadPersonas(filepath) vector~UserPersona~
+        +LoadForenamesByCountry(filepath) unordered_map~string, forename_list~
+        +LoadSurnamesByCountry(filepath) unordered_map~string, surname_list~
+    }
+    note for JsonLoader "Each Load* method memoizes its result in cache_ after its first call"
+
+    class MockCuratedDataService {
+        -vector~Location~ locations_
+        -vector~UserPersona~ personas_
+        -unordered_map~string, forename_list~ forenames_by_country_
+        -unordered_map~string, surname_list~ surnames_by_country_
+        +LoadLocations(filepath) vector~Location~
+        +LoadPersonas(filepath) vector~UserPersona~
+        +LoadForenamesByCountry(filepath) unordered_map~string, forename_list~
+        +LoadSurnamesByCountry(filepath) unordered_map~string, surname_list~
+    }
+    note for MockCuratedDataService "Fixed 4-location/3-persona dataset (US, DE, FR, BE) for --mocked runs; filepath arguments are ignored"
+
+    class IExportService {
+        <<interface>>
+        +Initialize() void
+        +ProcessRecord(brewery) uint64_t
+        +ProcessRecord(user) uint64_t
+        +Finalize() void
+    }
+
+    class SqliteExportService {
+        -unique_ptr~IDateTimeProvider~ date_time_provider_
+        -string run_timestamp_utc_
+        -path database_path_
+        -SqliteDatabaseHandle db_handle_
+        -SqliteStatementHandle insert_location_stmt_
+        -SqliteStatementHandle insert_brewery_stmt_
+        -SqliteStatementHandle insert_user_stmt_
+        -bool transaction_open_
+        -unordered_map~string, sqlite3_int64~ location_cache_
+        +Initialize() void
+        +ProcessRecord(brewery) uint64_t
+        +ProcessRecord(user) uint64_t
+        +Finalize() void
+        -InitializeSchema() void
+        -ResolveLocationId(location) sqlite3_int64
+    }
+
+    class IDateTimeProvider {
+        <<interface>>
+        +GetUtcTimestamp() string
+    }
+
+    class SystemDateTimeProvider {
+        +GetUtcTimestamp() string
+    }
+
+    BiergartenPipelineOrchestrator *-- ILogger : owns
+    BiergartenPipelineOrchestrator *-- IEnrichmentService : owns
+    BiergartenPipelineOrchestrator *-- DataGenerator : owns
+    BiergartenPipelineOrchestrator *-- IExportService : owns
+    BiergartenPipelineOrchestrator *-- ICuratedDataService : owns
+
+    LogEntry *-- LogLevel
+    LogEntry *-- PipelinePhase
+    LogDTO *-- LogLevel
+    LogDTO *-- PipelinePhase
+    ILogger <|.. LogProducer : implements
+    LogProducer ..> LogEntry : emits
+    LogDispatcher ..> LogEntry : consumes
+
+    IEnrichmentService <|.. WikipediaEnrichmentService : implements
+    IEnrichmentService <|.. MockEnrichmentService : implements
+    WikipediaEnrichmentService *-- WebClient : owns
+
+    WebClient <|.. HttpWebClient : implements
+
+    DataGenerator <|.. MockGenerator : implements
+    DataGenerator <|.. LlamaGenerator : implements
+    DataGenerator <|.. OpenAIGenerator : implements
+
+    LlamaGenerator *-- IPromptFormatter : uses
+    LlamaGenerator *-- IPromptDirectory : uses
+
+    OpenAIGenerator *-- IPromptDirectory : uses
+    OpenAIGenerator *-- WebClient : uses
+
+    IPromptFormatter <|.. Gemma4JinjaPromptFormatter : implements
+    IPromptDirectory <|.. PromptDirectory : implements
+
+    ICuratedDataService <|.. JsonLoader : implements
+    ICuratedDataService <|.. MockCuratedDataService : implements
+
+    IExportService <|.. SqliteExportService : implements
+    SqliteExportService *-- IDateTimeProvider : owns
+    IDateTimeProvider <|.. SystemDateTimeProvider : implements
+```