Add user generation feature

docs/pipeline/ETHICS-AND-KNOWN-ISSUES.md

@@ -13,6 +13,7 @@ low-resource language failures.
 - [Model Bias and Language Quality](#model-bias-and-language-quality)
 - [Western and Eurocentric Lens](#western-and-eurocentric-lens)
 - [Wikipedia Enrichment](#wikipedia-enrichment)
+- [Names-by-Country Dataset](#names-by-country-dataset)
 - [The "Avoid AI Phrases" Prompt Instruction](#the-avoid-ai-phrases-prompt-instruction)
 - [Known Issues](#known-issues)
   - [Hallucinated Brewing Techniques](#hallucinated-brewing-techniques)
@@ -91,6 +92,33 @@ generated descriptions.
 
 ---
 
+## Names-by-Country Dataset
+
+`tooling/pipeline/forenames-by-country.json` and `surnames-by-country.json`
+(used to sample a `Name` per ISO 3166-1 country code for user generation) are
+vendored verbatim, unmodified, from
+[sigpwned/popular-names-by-country-dataset](https://github.com/sigpwned/popular-names-by-country-dataset)
+(the `common-forenames-by-country.json` / `common-surnames-by-country.json`
+release assets), released under **CC0** (public domain). That dataset's own
+forename/surname lists are pulled from Wikipedia's "Lists of most common
+surnames" and "List of most popular given names" as of the week of
+2023-07-08 — see that project's README for full provenance. Names are not
+LLM-generated; this is curated fixture data per ROADMAP.md §2. Per-forename
+gender from the source data is preserved through to the sampled `Name`
+(rather than discarded during loading) so it's available for gender-aware
+persona/bio generation later.
+
+The full multinational dataset is kept as-is (106 countries for forenames,
+75 for surnames) rather than trimmed to `locations.json`'s current country
+list, so it doesn't need re-sourcing if more countries are added later.
+`NamesByCountry::SampleName()` returns no result for a country present in
+neither file; of the countries in `locations.json`, that's currently `KE`,
+`SE`, `SG`, `TH`, `VN`, and `ZA` — `GenerateUsers` skips cities in those
+countries the same way brewery generation skips cities whose enrichment
+lookup fails.
+
+---
+
 ## The "Avoid AI Phrases" Prompt Instruction
 
 The system prompt instructs the model to avoid common AI-generated phrasing

docs/pipeline/ROADMAP.md

@@ -33,28 +33,60 @@ architecture needs.
 - [ ] Add `BeerResult`, `CheckinResult`, `RatingResult` result payloads.
 - [ ] Add `GenerationMetadata` (`generation_id`, `generated_time`,
       `context_provided`, `generated_with`).
-- [ ] Add `activity_weight` to `UserResult` (currently just `username`,
-      `bio`).
+- [x] Add `first_name`, `last_name`, `gender`, and `activity_weight` to
+      `UserResult` (currently just `username`, `bio`). `first_name`/
+      `last_name`/`gender` are copied from the sampled `Name` (see below),
+      not LLM-invented.
+- [x] Add `Name` (`first_name`, `last_name`, `gender`) — the sampled result
+      handed to `DataGenerator::GenerateUser`. Add `ForenameEntry` (`name`,
+      `gender`) and a `NamesByCountry` class (not a bare typedef) that owns
+      two maps — `std::unordered_map<std::string, std::vector<ForenameEntry>>`
+      and `std::unordered_map<std::string, std::vector<std::string>>`, both
+      keyed by ISO 3166-1 code — and exposes `SampleName(iso3166_1, rng)`.
+      Pairing a forename with a surname happens at sample time so gender
+      (present per-forename in the source data) is never discarded the way a
+      pre-flattened `{first_name, last_name}` list would lose it; see
+      `LoadNamesByCountry()` below.
 - [ ] Extend `GeneratedBrewery` with `brewery_id`, `context_completeness`,
       `metadata` (currently just `{location, brewery}`).
-- [ ] Add `GeneratedBeer`, `GeneratedUser`, `GeneratedCheckin`,
-      `GeneratedRating`, `GeneratedFollow` aggregate structs.
-- [ ] Add `UserPersona` (`name`, `description`, `style_affinities`).
+- [ ] Add `GeneratedBeer`, `GeneratedCheckin`, `GeneratedRating`,
+      `GeneratedFollow` aggregate structs.
+- [x] Add `GeneratedUser` aggregate struct. Carries `email`, `date_of_birth`,
+      and `password` — programmatically generated by the orchestrator, never
+      LLM-authored — so a downstream auth-account seeding consumer (outside
+      this repo tree's docs) can register real accounts from the pipeline's
+      SQLite export. Skips `user_id`/`metadata` for now, matching
+      `GeneratedBrewery`'s current (pre-`brewery_id`/`metadata`) shape. Not
+      yet wired into `IExportService`/`SqliteExportService` — `GenerateUsers`
+      currently only logs and holds `generated_users_` in memory; no `users`
+      table exists in the SQLite export yet (see §5).
+- [x] Add `UserPersona` (`name`, `description`, `style_affinities`).
 
 ## 2. Data Preloading
 
 `tooling/pipeline/includes/json_handling/`, fixture files.
 
-- [ ] Extract a `DataPreloader` interface; have `JsonLoader` implement it
-      instead of exposing only a static `LoadLocations()`.
+- [ ] Extract a `DataPreloader` interface; have `JsonLoader` implement it.
+      `JsonLoader` now also exposes static `LoadPersonas()` and
+      `LoadNamesByCountry()` (see below), but as additional static methods,
+      not yet behind a formal interface.
 - [ ] Add `LoadBeerStyles()`. `beer-styles.json` already exists in the repo
       and is already copied into the Docker image
       (`runpod/Dockerfile`), but no loader reads it yet, and the native
       CMake build doesn't copy it into `build/` at all — `CMakeLists.txt`'s
       "Runtime Assets" step only copies `locations.json` and `prompts/`.
-- [ ] Add `LoadPersonas()` and author `personas.json` (doesn't exist yet).
-- [ ] Add `LoadNamesByCountry()` and author `names-by-country.json` (doesn't
-      exist yet).
+- [x] Add `LoadPersonas()` and author `personas.json` (doesn't exist yet).
+- [x] Add `LoadNamesByCountry(forenames_filepath, surnames_filepath)`,
+      parsing `tooling/pipeline/forenames-by-country.json` and
+      `surnames-by-country.json` into a `NamesByCountry`. Both files are
+      vendored verbatim (unmodified, full multinational coverage) from
+      `sigpwned/popular-names-by-country-dataset` (CC0) — see
+      ETHICS-AND-KNOWN-ISSUES.md's Names-by-Country Dataset section for
+      provenance. Deliberately not pre-paired or filtered down to just the
+      countries in `locations.json`: keeping the source shape (including
+      per-forename gender) intact means the loader can support more
+      countries later, or gender-aware persona/bio generation, without
+      re-sourcing data.
 
 ## 3. Policy / Strategy Layer
 
@@ -83,10 +115,14 @@ Entirely new — no `includes/policy/` (or equivalent) directory exists today.
 - [ ] Extend the `DataGenerator` interface with `GenerateBeer`,
       `GenerateCheckin`, `GenerateRating` (today: only `GenerateBrewery` and
       `GenerateUser`).
-- [ ] Implement `LlamaGenerator::GenerateUser` for real. It currently
-      returns a hardcoded `{"test_user", "This is a test user profile from
-    {locale}."}` regardless of input — see the `// TODO` at the top of
-      `src/data_generation/llama/generate_user.cc`.
+- [x] Implement `LlamaGenerator::GenerateUser` for real, with a retry loop
+      mirroring `GenerateBrewery` (GBNF grammar, `ValidateUserJson`, up to 3
+      attempts with corrective feedback) and a new
+      `prompts/USER_GENERATION.md`. Changed the `DataGenerator::GenerateUser`
+      signature to
+      `(city : const EnrichedCity&, persona : const UserPersona&, name : const Name&) : UserResult`,
+      matching what the activity diagram actually passes. `MockGenerator::GenerateUser`
+      updated to match the new signature too.
 - [ ] Implement `MockGenerator::GenerateBeer` / `GenerateCheckin` /
       `GenerateRating`.
 - [ ] Add `IPromptFormatter::ExpectedArchitecture()` and

docs/pipeline/diagrams/planned/activity.puml

@@ -43,7 +43,7 @@ fork again
   :EnrichmentService::PreWarmLocationCache(sampled_locations);
 end fork
 fork
-  :JsonLoader::LoadNamesByCountry("names-by-country.json");
+  :JsonLoader::LoadNamesByCountry(\n  "forenames-by-country.json",\n  "surnames-by-country.json");
 fork again
   :JsonLoader::LoadPersonas("personas.json");
 end fork

docs/pipeline/diagrams/planned/class.puml

@@ -67,11 +67,47 @@ package "Domain: Models" {
   }
 
   class UserResult {
+    + first_name : std::string
+    + last_name : std::string
+    + gender : std::string
     + username : std::string
     + bio : std::string
     + activity_weight : float
   }
 
+  class Name {
+    + first_name : std::string
+    + last_name : std::string
+    + gender : std::string
+  }
+
+  class ForenameEntry {
+    + name : std::string
+    + gender : std::string
+  }
+
+  class NamesByCountry {
+    - forenames_by_country_ : std::unordered_map<std::string, std::vector<ForenameEntry>>
+    - surnames_by_country_ : std::unordered_map<std::string, std::vector<std::string>>
+    + SampleName(iso3166_1 : const std::string&,\n  rng : std::mt19937&) : std::optional<Name>
+  }
+
+  note right of NamesByCountry
+    Backed by two source-shaped maps,
+    keyed by ISO 3166-1 country code,
+    sourced from popular-names-by-country-dataset
+    (CC0) -- see ETHICS-AND-KNOWN-ISSUES.md.
+    Gender is preserved per forename so it can
+    be threaded through to persona/bio generation
+    later; surnames carry no gender in the source
+    data. Pairing happens at sample time, not at
+    fixture-authoring time, so no information from
+    the source dataset is discarded up front.
+  end note
+
+  NamesByCountry *-- "0..*" ForenameEntry
+  NamesByCountry ..> Name : produces
+
   class CheckinResult {
     + checked_in_at : std::string
     + note : std::string
@@ -110,9 +146,20 @@ package "Domain: Models" {
     + user_id : uint64_t
     + location : Location
     + user : UserResult
+    + email : std::string
+    + date_of_birth : std::string
+    + password : std::string
     + metadata : GenerationMetadata
   }
 
+  note right of GeneratedUser
+    email, date_of_birth, and password are
+    programmatically generated by the orchestrator
+    (not LLM-authored) so a downstream auth-account
+    seeding consumer can register real accounts from
+    this export. See ROADMAP.md §1.
+  end note
+
   class GeneratedCheckin {
     + checkin_id : uint64_t
     + user_id : uint64_t
@@ -321,15 +368,15 @@ package "Infrastructure: Data Preloading" {
   interface DataPreloader <<interface>> {
     + LoadLocations(filepath : const std::filesystem::path&) : std::vector<Location>
     + LoadBeerStyles(filepath : const std::filesystem::path&) : std::vector<BeerStyle>
-    + LoadPersonas(filepath : const std::filesystem::path&) : std::vector<Persona>
-    + LoadNamesByCountry(filepath : const std::filesystem::path&) : NamesByCountry
+    + LoadPersonas(filepath : const std::filesystem::path&) : std::vector<UserPersona>
+    + LoadNamesByCountry(forenames_filepath : const std::filesystem::path&,\n  surnames_filepath : const std::filesystem::path&) : NamesByCountry
   }
 
   class JsonLoader {
     + LoadLocations(filepath : const std::filesystem::path&) : std::vector<Location>
     + LoadBeerStyles(filepath : const std::filesystem::path&) : std::vector<BeerStyle>
-    + LoadPersonas(filepath : const std::filesystem::path&) : std::vector<Persona>
-    + LoadNamesByCountry(filepath : const std::filesystem::path&) : NamesByCountry
+    + LoadPersonas(filepath : const std::filesystem::path&) : std::vector<UserPersona>
+    + LoadNamesByCountry(forenames_filepath : const std::filesystem::path&,\n  surnames_filepath : const std::filesystem::path&) : NamesByCountry
   }
 
 }
@@ -380,7 +427,7 @@ package "Infrastructure: Data Generation" {
   interface DataGenerator <<interface>> {
     + GenerateBrewery(location : const Location&,\n  context : const LocationContext&) : BreweryResult
     + GenerateBeer(brewery_id : uint64_t,\n  location : const Location&,\n  context : const LocationContext&,\n  style : const BeerStyle&) : BeerResult
-    + GenerateUser(location : const Location&) : UserResult
+    + GenerateUser(city : const EnrichedCity&,\n  persona : const UserPersona&,\n  name : const Name&) : UserResult
     + GenerateCheckin(user : const GeneratedUser&,\n  brewery : const GeneratedBrewery&,\n  timestamp : const std::string&) : CheckinResult
     + GenerateRating(user : const GeneratedUser&,\n  beer : const GeneratedBeer&,\n  checkin_id : uint64_t) : RatingResult
   }

tooling/pipeline/CMakeLists.txt

@@ -151,6 +151,11 @@ target_sources(${PROJECT_NAME} PRIVATE
         src/json_handling/json_loader.cc
 )
 
+# --- data_model ---
+target_sources(${PROJECT_NAME} PRIVATE
+        src/data_model/names_by_country.cc
+)
+
 # --- application_options ---
 target_sources(${PROJECT_NAME} PRIVATE
         src/application_options/parse_arguments.cc
@@ -161,6 +166,7 @@ target_sources(${PROJECT_NAME} PRIVATE
         src/biergarten_pipeline_orchestrator/log_results.cc
         src/biergarten_pipeline_orchestrator/biergarten_pipeline_orchestrator.cc
         src/biergarten_pipeline_orchestrator/generate_breweries.cc
+        src/biergarten_pipeline_orchestrator/generate_users.cc
         src/biergarten_pipeline_orchestrator/run.cc
         src/biergarten_pipeline_orchestrator/query_cities_with_countries.cc
 )
@@ -260,6 +266,21 @@ configure_file(
         ${CMAKE_BINARY_DIR}/locations.json
         COPYONLY
 )
+configure_file(
+        ${CMAKE_SOURCE_DIR}/personas.json
+        ${CMAKE_BINARY_DIR}/personas.json
+        COPYONLY
+)
+configure_file(
+        ${CMAKE_SOURCE_DIR}/forenames-by-country.json
+        ${CMAKE_BINARY_DIR}/forenames-by-country.json
+        COPYONLY
+)
+configure_file(
+        ${CMAKE_SOURCE_DIR}/surnames-by-country.json
+        ${CMAKE_BINARY_DIR}/surnames-by-country.json
+        COPYONLY
+)
 add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD
         COMMAND ${CMAKE_COMMAND} -E copy_directory
         ${CMAKE_SOURCE_DIR}/prompts

tooling/pipeline/includes/biergarten_pipeline_orchestrator.h

@@ -91,6 +91,18 @@ class BiergartenPipelineOrchestrator {
    */
   void GenerateBreweries(std::span<const EnrichedCity> cities);
 
+  /**
+   * @brief Generate users grounded in sampled names and personas for
+   * enriched cities.
+   *
+   * Loads personas.json / forenames-by-country.json / surnames-by-country.json
+   * itself, mirroring how QueryCitiesWithCountries() owns its own
+   * locations.json load.
+   *
+   * @param cities Span of enriched city data.
+   */
+  void GenerateUsers(std::span<const EnrichedCity> cities);
+
   /**
    * @brief Log the generated brewery results.
    */
@@ -98,5 +110,8 @@ class BiergartenPipelineOrchestrator {
 
   /// @brief Stores generated brewery data.
   std::vector<GeneratedBrewery> generated_breweries_;
+
+  /// @brief Stores generated user data.
+  std::vector<GeneratedUser> generated_users_;
 };
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_BIERGARTEN_DATA_GENERATOR_H_

tooling/pipeline/includes/data_generation/data_generator.h

@@ -28,12 +28,16 @@ class DataGenerator {
                                         const std::string& region_context) = 0;
 
   /**
-   * @brief Generates a user profile for a locale.
+   * @brief Generates a user profile grounded in a sampled name and persona.
    *
-   * @param locale Locale hint used by generator.
+   * @param city Enriched city the user is associated with.
+   * @param persona Persona archetype grounding the generated bio.
+   * @param name Sampled first/last name (and gender) -- not LLM-invented.
    * @return User generation result.
    */
-  virtual UserResult GenerateUser(const std::string& locale) = 0;
+  virtual UserResult GenerateUser(const EnrichedCity& city,
+                                  const UserPersona& persona,
+                                  const Name& name) = 0;
 };
 
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_GENERATION_DATA_GENERATOR_H_

tooling/pipeline/includes/data_generation/llama_generator.h

@@ -65,12 +65,15 @@ class LlamaGenerator final : public DataGenerator {
                                 const std::string& region_context) override;
 
   /**
-   * @brief Generates a user profile for the provided locale.
+   * @brief Generates a user profile grounded in a sampled name and persona.
    *
-   * @param locale Locale hint.
+   * @param city Enriched city the user is associated with.
+   * @param persona Persona archetype grounding the generated bio.
+   * @param name Sampled first/last name -- not LLM-invented.
    * @return Generated user profile.
    */
-  UserResult GenerateUser(const std::string& locale) override;
+  UserResult GenerateUser(const EnrichedCity& city, const UserPersona& persona,
+                          const Name& name) override;
 
  private:
   static constexpr int32_t kDefaultMaxTokens = 10000;

tooling/pipeline/includes/data_generation/llama_generator_helpers.h

@@ -47,4 +47,18 @@ void AppendTokenPiece(const llama_vocab* vocab, llama_token token,
 std::optional<std::string> ValidateBreweryJson(const std::string& raw,
                                                BreweryResult& brewery_out);
 
+/**
+ * @brief Validates and parses user JSON output.
+ *
+ * Only populates `username`, `bio`, and `activity_weight` -- `first_name`
+ * and `last_name` are not LLM-authored and are set separately from the
+ * sampled Name.
+ *
+ * @param raw Raw model output.
+ * @param user_out Parsed user payload.
+ * @return Validation error message if invalid, or std::nullopt on success.
+ */
+std::optional<std::string> ValidateUserJson(const std::string& raw,
+                                            UserResult& user_out);
+
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_GENERATION_LLAMA_GENERATOR_HELPERS_H_

tooling/pipeline/includes/data_generation/mock_generator.h

@@ -28,12 +28,16 @@ class MockGenerator final : public DataGenerator {
                                 const std::string& region_context) override;
 
   /**
-   * @brief Generates deterministic user data for a locale.
+   * @brief Generates deterministic user data grounded in a sampled name and
+   * persona.
    *
-   * @param locale Locale hint.
+   * @param city Enriched city the user is associated with.
+   * @param persona Persona archetype.
+   * @param name Sampled first/last name. Unused for mock generation.
    * @return Generated user result.
    */
-  UserResult GenerateUser(const std::string& locale) override;
+  UserResult GenerateUser(const EnrichedCity& city, const UserPersona& persona,
+                          const Name& name) override;
 
  private:
   /**
@@ -44,12 +48,26 @@ class MockGenerator final : public DataGenerator {
    */
   static size_t DeterministicHash(const Location& location);
 
+  /**
+   * @brief Combines city, persona, and name into a stable hash value.
+   *
+   * @param location City and country names.
+   * @param persona Persona archetype.
+   * @param name Sampled first/last name.
+   * @return Deterministic hash value.
+   */
+  static size_t DeterministicHash(const Location& location,
+                                  const UserPersona& persona,
+                                  const Name& name);
+
   // Hash stride constants for deterministic distribution across fixed-size
   // arrays. These coprime strides spread hash values uniformly without
   // clustering, ensuring diverse output across different hash inputs.
   static constexpr size_t kNounHashStride = 7;
   static constexpr size_t kDescriptionHashStride = 13;
   static constexpr size_t kBioHashStride = 11;
+  static constexpr size_t kActivityWeightHashStride = 17;
+  static constexpr size_t kActivityWeightHashRange = 1000;
 
   static constexpr std::array<std::string_view, 18> kBreweryAdjectives = {
       "Craft",      "Heritage", "Local",  "Artisan",  "Pioneer",    "Golden",

tooling/pipeline/includes/data_model/generated_models.h

@@ -36,11 +36,27 @@ struct BreweryResult {
  * @brief Generated user profile payload.
  */
 struct UserResult {
+  /// @brief First (given) name, copied from the sampled Name -- not
+  /// LLM-invented.
+  std::string first_name{};
+
+  /// @brief Last (family) name, copied from the sampled Name -- not
+  /// LLM-invented.
+  std::string last_name{};
+
+  /// @brief Gender associated with the sampled first name, copied from the
+  /// sampled Name -- not LLM-invented.
+  std::string gender{};
+
   /// @brief Username handle.
   std::string username{};
 
   /// @brief Short user biography.
   std::string bio{};
+
+  /// @brief Relative check-in/activity weight for this user, used to drive
+  /// a J-curve activity profile in later pipeline phases.
+  float activity_weight{};
 };
 
 // ============================================================================
@@ -63,4 +79,19 @@ struct GeneratedBrewery {
   BreweryResult brewery;
 };
 
+/**
+ * @brief Helper struct to store generated user data.
+ *
+ * `email`, `date_of_birth`, and `password` are programmatically generated by
+ * the orchestrator (never LLM-authored) so a downstream auth-account seeding
+ * consumer can register real accounts from the pipeline's SQLite export.
+ */
+struct GeneratedUser {
+  Location location;
+  UserResult user;
+  std::string email{};
+  std::string date_of_birth{};
+  std::string password{};
+};
+
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_GENERATED_MODELS_H_

tooling/pipeline/includes/data_model/models.h

@@ -64,6 +64,53 @@ struct BreweryLocation {
   std::string_view country_name;
 };
 
+// ============================================================================
+// Name / Persona Models
+// ============================================================================
+
+/**
+ * @brief A sampled first/last name pair, with the source forename's gender.
+ *
+ * Produced by NamesByCountry::SampleName();
+ */
+struct Name {
+  /// @brief First (given) name.
+  std::string first_name{};
+
+  /// @brief Last (family) name.
+  std::string last_name{};
+
+  /// @brief Gender associated with the sampled forename (e.g. "M", "F"), as
+  /// reported by the source dataset.
+  std::string gender{};
+};
+
+/**
+ * @brief A single forename entry from the names-by-country fixture data.
+ */
+struct ForenameEntry {
+  /// @brief Romanized forename.
+  std::string name{};
+
+  /// @brief Gender associated with this forename, as reported by the source
+  /// dataset (e.g. "M", "F").
+  std::string gender{};
+};
+
+/**
+ * @brief A persona archetype used to ground LLM-generated user bios.
+ */
+struct UserPersona {
+  /// @brief Persona display name (e.g. "Hophead Explorer").
+  std::string name{};
+
+  /// @brief Short description of the persona's interests and voice.
+  std::string description{};
+
+  /// @brief Beer styles this persona gravitates toward.
+  std::vector<std::string> style_affinities{};
+};
+
 // ============================================================================
 // Configuration Models
 // ============================================================================

tooling/pipeline/includes/data_model/names_by_country.h

@@ -0,0 +1,52 @@
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_NAMES_BY_COUNTRY_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_NAMES_BY_COUNTRY_H_
+
+/**
+ * @file data_model/names_by_country.h
+ * @brief Sampling over the names-by-country fixture data.
+ */
+
+#include <optional>
+#include <random>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "data_model/models.h"
+
+/**
+ * @brief Samples locale-appropriate names from curated forename/surname
+ * fixture data, keyed by ISO 3166-1 country code.
+ *
+ * Forenames and surnames are kept in separate maps (mirroring the source
+ * dataset's own shape) so per-forename gender is preserved; pairing happens
+ * at sample time rather than being precomputed, so no information from the
+ * source dataset is discarded up front.
+ */
+class NamesByCountry {
+ public:
+  NamesByCountry(
+      std::unordered_map<std::string, std::vector<ForenameEntry>>
+          forenames_by_country,
+      std::unordered_map<std::string, std::vector<std::string>>
+          surnames_by_country);
+
+  /**
+   * @brief Samples a first/last name pair for the given country.
+   *
+   * @param iso3166_1 ISO 3166-1 country code to sample for.
+   * @param rng Random source used for sampling.
+   * @return A sampled Name, or std::nullopt if the country has no forename
+   * or no surname entries.
+   */
+  [[nodiscard]] std::optional<Name> SampleName(const std::string& iso3166_1,
+                                               std::mt19937& rng) const;
+
+ private:
+  std::unordered_map<std::string, std::vector<ForenameEntry>>
+      forenames_by_country_;
+  std::unordered_map<std::string, std::vector<std::string>>
+      surnames_by_country_;
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_DATA_MODEL_NAMES_BY_COUNTRY_H_

tooling/pipeline/includes/json_handling/json_loader.h

@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "data_model/models.h"
+#include "data_model/names_by_country.h"
 #include "services/logging/logger.h"
 
 /// @brief Loads curated world locations from a JSON file into memory.
@@ -20,6 +21,23 @@ class JsonLoader {
   static std::vector<Location> LoadLocations(
       const std::filesystem::path& filepath,
       std::shared_ptr<ILogger> logger = nullptr);
+
+  /// @brief Parses a JSON array file and returns all persona records.
+  static std::vector<UserPersona> LoadPersonas(
+      const std::filesystem::path& filepath,
+      std::shared_ptr<ILogger> logger = nullptr);
+
+  /**
+   * @brief Parses the names-by-country fixture pair into a sampling-capable
+   * NamesByCountry.
+   *
+   * @param forenames_filepath Path to forenames-by-country.json.
+   * @param surnames_filepath Path to surnames-by-country.json.
+   */
+  static NamesByCountry LoadNamesByCountry(
+      const std::filesystem::path& forenames_filepath,
+      const std::filesystem::path& surnames_filepath,
+      std::shared_ptr<ILogger> logger = nullptr);
 };
 
 #endif  // BIERGARTEN_PIPELINE_INCLUDES_JSON_HANDLING_JSON_LOADER_H_

tooling/pipeline/personas.json

@@ -0,0 +1,42 @@
+[
+  {
+    "name": "Hophead Explorer",
+    "description": "Chases the newest hop varieties and double-digit IBUs, tracking hazy releases and limited tap takeovers across town.",
+    "style_affinities": ["American IPA", "Double IPA", "New England IPA", "Black IPA"]
+  },
+  {
+    "name": "Malt & Tradition Loyalist",
+    "description": "Prefers clean, balanced lagers brewed the way their region has brewed them for generations, and is quick to defend a well-made Helles.",
+    "style_affinities": ["Munich Helles", "Vienna Lager", "Märzen", "Festbier"]
+  },
+  {
+    "name": "Dark & Roasty Devotee",
+    "description": "Orders the darkest beer on the board year-round, drawn to roasted malt, coffee, and chocolate notes over carbonated lightness.",
+    "style_affinities": ["Imperial Stout", "Robust Porter", "Baltic Porter", "Oatmeal Stout"]
+  },
+  {
+    "name": "Sour & Wild Forager",
+    "description": "Seeks out barrel-aged, spontaneously fermented, and funky beers, and will travel for a fresh bottling of something wild.",
+    "style_affinities": ["Lambic", "Gueuze", "Flanders Red Ale", "Wild Ale"]
+  },
+  {
+    "name": "Session Sipper",
+    "description": "Values an easy-drinking pint that holds up over a long afternoon at the taproom more than raw intensity or novelty.",
+    "style_affinities": ["Session IPA", "Ordinary Bitter", "Cream Ale", "Blonde Ale"]
+  },
+  {
+    "name": "Belgian Abbey Pilgrim",
+    "description": "Collects abbey and trappist releases, drawn to the dried-fruit esters and warming strength of classic Belgian ales.",
+    "style_affinities": ["Belgian Tripel", "Belgian Dubbel", "Belgian Quadrupel", "Trappist Single"]
+  },
+  {
+    "name": "Wheat & Citrus Casual",
+    "description": "Reaches for something light, cloudy, and refreshing, usually with a citrus or coriander note, especially on a patio in summer.",
+    "style_affinities": ["Hefeweizen", "Witbier", "American Wheat Beer", "Berliner Weisse"]
+  },
+  {
+    "name": "Big & Boozy Connoisseur",
+    "description": "Sips slowly from a snifter, seeking out high-ABV releases meant for aging and savoring rather than quick refreshment.",
+    "style_affinities": ["English Barleywine", "Wee Heavy", "Doppelbock", "Old Ale"]
+  }
+]

tooling/pipeline/prompts/USER_GENERATION.md

@@ -0,0 +1,122 @@
+# FULL SYSTEM PROMPT
+
+You are a craft beer community profile writer. You write short, first-person
+biographies for fictional users of a brewery-discovery app, grounded in the
+exact name, locale, and persona provided. You do not invent the user's name --
+it is given to you and must not be altered, translated, or abbreviated beyond
+forming a username.
+
+You will receive the inputs like this:
+
+## NAME:
+
+[First name] [Last name]
+
+## GENDER:
+
+[Gender associated with the given first name]
+
+## CITY:
+
+[City Name]
+
+## COUNTRY:
+
+[Country Name]
+
+## PERSONA:
+
+[Persona archetype name]
+
+## PERSONA DESCRIPTION:
+
+[What this persona cares about and how they talk about beer]
+
+## STYLE AFFINITIES:
+
+[Comma-separated beer styles this persona favors]
+
+## CRITICAL OUTPUT FORMAT (READ CAREFULLY):
+
+ABSOLUTELY NO MARKDOWN FORMATTING. Do NOT wrap your response in json or ```
+blocks.
+
+Do not add markdown, code fences, or postscript around the final JSON object.
+Do not say "Here is the JSON" or "Enjoy!".
+
+The JSON must contain exactly three keys ("username", "bio",
+"activity_weight") in that order. Do not rename or add any other keys.
+
+ESCAPE ALL QUOTES inside the bio field using \", or use single quotes (' ')
+instead.
+
+DO NOT use actual line breaks (\n) inside any string. Keep the bio as one
+continuous string.
+
+The bio must be between 25 and 60 words, written in first person, and must
+read as something this specific person would write about themselves -- not a
+generic profile blurb.
+
+`activity_weight` is a number between 0 and 1 (inclusive) representing how
+often this persona checks in at breweries relative to other users. Persona
+archetypes implying frequent, habitual brewery visits should skew higher;
+casual or occasional-visitor personas should skew lower. Do not default to
+0.5 -- vary it meaningfully based on the persona description.
+
+Expected JSON format:
+
+```json
+{
+  "username": "a handle derived from the given name",
+  "bio": "The first-person bio goes here.",
+  "activity_weight": 0.62
+}
+```
+
+## CONTENT RULES AND CONSTRAINTS:
+
+### THE USERNAME:
+
+Derive the username from the given first and/or last name (e.g. lowercase,
+abbreviated, or combined with a short word or number tied to the persona's
+style affinities). Do not invent an unrelated handle. Do not include spaces.
+
+### THE BIO:
+
+Ground the bio in the supplied persona description and style affinities --
+mention at least one specific beer style from the style affinities list, in a
+way that sounds like a personal preference rather than a list. Reference the
+city or country naturally if it fits, but do not force it.
+
+### VOICE & PERSPECTIVE:
+
+Write in the first person ("I"/"my"). The tone should match the persona:
+an enthusiastic explorer sounds different from a relaxed, easy-drinking
+regular. Do not write in second or third person.
+
+### THE BLOCKLIST (FORBIDDEN CONCEPTS):
+
+You absolutely cannot use the following words and phrases. Make sure your
+final output doesn't have any of these:
+
+- "hidden gem"
+- "passion"
+- "authentic"
+- "craft beer enthusiast"
+- "beer connoisseur"
+- "journey"
+
+#### FORBIDDEN WRITING PATTERNS
+
+The following patterns are common AI writing pitfalls and must not appear in
+the bio:
+
+- Negative parallelism constructions: "It's not X, it's Y"
+- Inflated significance phrases: "stands as a testament," "plays a vital
+  role," "deeply rooted"
+- Superficial trailing analyses: sentences ending in -ing words that add
+  opinion without content
+- Promotional travel-copy tone: "breathtaking," "must-visit," "vibrant"
+- Overused conjunctive transitions used as sentence openers: "Moreover,"
+  "Furthermore," "In addition"
+- Rule of three: do not consistently organise ideas or examples in triplets

tooling/pipeline/src/biergarten_pipeline_orchestrator/generate_users.cc

@@ -0,0 +1,160 @@
+/**
+ * @file biergarten_pipeline_orchestrator/generate_users.cc
+ * @brief BiergartenDataGenerator::GenerateUsers() implementation.
+ */
+
+#include <cctype>
+#include <chrono>
+#include <format>
+#include <optional>
+#include <random>
+#include <stdexcept>
+#include <string>
+#include <string_view>
+#include <unordered_set>
+
+#include "biergarten_pipeline_orchestrator.h"
+#include "json_handling/json_loader.h"
+#include "services/logging/logger.h"
+
+namespace {
+
+std::string Sanitize(std::string_view value) {
+  std::string out;
+  out.reserve(value.size());
+  for (const char character : value) {
+    if (std::isalnum(static_cast<unsigned char>(character)) != 0) {
+      out.push_back(
+          static_cast<char>(std::tolower(static_cast<unsigned char>(character))));
+    }
+  }
+  return out;
+}
+
+std::string BuildEmail(const Name& name,
+                       std::unordered_set<std::string>& used_local_parts) {
+  const std::string base =
+      std::format("{}.{}", Sanitize(name.first_name), Sanitize(name.last_name));
+
+  std::string local_part = base;
+  for (int suffix = 1; used_local_parts.contains(local_part); ++suffix) {
+    local_part = std::format("{}{}", base, suffix);
+  }
+  used_local_parts.insert(local_part);
+
+  return std::format("{}@thebiergarten.app", local_part);
+}
+
+std::string GenerateDateOfBirth(std::mt19937& rng) {
+  using namespace std::chrono;
+
+  constexpr int kMinAge = 19;
+  constexpr int kMaxAge = 48;
+  constexpr int kMaxDayOffset = 364;
+
+  std::uniform_int_distribution<int> age_dist(kMinAge, kMaxAge);
+  std::uniform_int_distribution<int> day_offset_dist(0, kMaxDayOffset);
+
+  const year_month_day today{floor<days>(system_clock::now())};
+  const year_month_day birth_year_anchor{today.year() - years{age_dist(rng)},
+                                         today.month(), today.day()};
+  const sys_days birth_date =
+      sys_days{birth_year_anchor} - days{day_offset_dist(rng)};
+  const year_month_day birth_ymd{birth_date};
+
+  return std::format("{:04}-{:02}-{:02}",
+                     static_cast<int>(birth_ymd.year()),
+                     static_cast<unsigned>(birth_ymd.month()),
+                     static_cast<unsigned>(birth_ymd.day()));
+}
+
+std::string GenerateRandomPassword(std::mt19937& rng) {
+  constexpr size_t kPasswordLength = 32;
+  constexpr std::string_view kCharset =
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*";
+
+  std::uniform_int_distribution<size_t> char_dist(0, kCharset.size() - 1);
+
+  std::string password;
+  password.reserve(kPasswordLength);
+  for (size_t i = 0; i < kPasswordLength; ++i) {
+    password.push_back(kCharset[char_dist(rng)]);
+  }
+  return password;
+}
+
+}  // namespace
+
+void BiergartenPipelineOrchestrator::GenerateUsers(
+    std::span<const EnrichedCity> cities) {
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::UserGeneration,
+                .message = "=== SAMPLE USER GENERATION ==="});
+
+  const std::vector<UserPersona> personas =
+      JsonLoader::LoadPersonas("personas.json", logger_);
+  if (personas.empty()) {
+    throw std::runtime_error(
+        "No personas available in personas.json for user generation");
+  }
+
+  const NamesByCountry names_by_country = JsonLoader::LoadNamesByCountry(
+      "forenames-by-country.json", "surnames-by-country.json", logger_);
+
+  std::mt19937 rng(std::random_device{}());
+  std::uniform_int_distribution<size_t> persona_dist(0, personas.size() - 1);
+
+  generated_users_.clear();
+  std::unordered_set<std::string> used_email_local_parts;
+  size_t skipped_count = 0;
+
+  for (const auto& city : cities) {
+    const std::optional<Name> sampled_name =
+        names_by_country.SampleName(city.location.iso3166_1, rng);
+
+    if (!sampled_name.has_value()) {
+      ++skipped_count;
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format(
+               "[Pipeline] Skipping city '{}' ({}): no names available for "
+               "country '{}'",
+               city.location.city, city.location.country,
+               city.location.iso3166_1)});
+      continue;
+    }
+
+    const UserPersona& persona = personas[persona_dist(rng)];
+
+    try {
+      const UserResult user =
+          generator_->GenerateUser(city, persona, *sampled_name);
+
+      generated_users_.push_back(GeneratedUser{
+          .location = city.location,
+          .user = user,
+          .email = BuildEmail(*sampled_name, used_email_local_parts),
+          .date_of_birth = GenerateDateOfBirth(rng),
+          .password = GenerateRandomPassword(rng),
+      });
+    } catch (const std::exception& e) {
+      ++skipped_count;
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format(
+               "[Pipeline] Skipping city '{}' ({}): user generation failed: {}",
+               city.location.city, city.location.country, e.what())});
+    }
+  }
+
+  if (skipped_count > 0) {
+    logger_->Log(
+        {.level = LogLevel::Warn,
+         .phase = PipelinePhase::UserGeneration,
+         .message = std::format(
+             "[Pipeline] Skipped {} city/cities during user generation",
+             skipped_count)});
+  }
+}

tooling/pipeline/src/biergarten_pipeline_orchestrator/log_results.cc

@@ -10,11 +10,12 @@
 #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;
+  boost::json::array brewery_output;
 
   for (const auto& [location, brewery] : generated_breweries_) {
-    output.push_back(boost::json::object{
+    brewery_output.push_back(boost::json::object{
         {"name_en", brewery.name_en},
         {"description_en", brewery.description_en},
         {"name_local", brewery.name_local},
@@ -29,9 +30,31 @@ void BiergartenPipelineOrchestrator::LogResults() const {
                      }}});
   }
 
-  std::ostringstream oss;
-  PrettyPrint(oss, output);
+  std::ostringstream brewery_oss;
+  PrettyPrint(brewery_oss, brewery_output);
   logger_->Log({.level = LogLevel::Info,
                 .phase = PipelinePhase::Teardown,
-                .message = oss.str()});
+                .message = brewery_oss.str()});
+
+  boost::json::array user_output;
+
+
+  for (const auto& generated_user : generated_users_) {
+    user_output.push_back(boost::json::object{
+        {"first_name", generated_user.user.first_name},
+        {"last_name", generated_user.user.last_name},
+        {"gender", generated_user.user.gender},
+        {"username", generated_user.user.username},
+        {"bio", generated_user.user.bio},
+        {"activity_weight", generated_user.user.activity_weight},
+        {"email", generated_user.email},
+        {"date_of_birth", generated_user.date_of_birth},
+    });
+  }
+
+  std::ostringstream user_oss;
+  PrettyPrint(user_oss, user_output);
+  logger_->Log({.level = LogLevel::Info,
+                .phase = PipelinePhase::Teardown,
+                .message = user_oss.str()});
 }

tooling/pipeline/src/biergarten_pipeline_orchestrator/run.cc

@@ -48,6 +48,7 @@ bool BiergartenPipelineOrchestrator::Run() {
                         skipped_count)});
     }
 
+    this->GenerateUsers(enriched);
     this->GenerateBreweries(enriched);
     exporter_->Finalize();
     this->LogResults();

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

@@ -1,24 +1,121 @@
 /**
  * @file data_generation/llama/generate_user.cc
- * @brief Generates locale-aware user profiles with strict two-line formatting,
- * retry handling, and output sanitization for downstream parsing.
+ * @brief Builds persona/name-grounded user prompts, performs retry-based
+ * inference, and validates structured JSON output for user records.
  */
 
-
 #include <format>
+#include <optional>
+#include <stdexcept>
 #include <string>
+#include <string_view>
 
 #include "data_generation/llama_generator.h"
 #include "data_generation/llama_generator_helpers.h"
 
-// TODO: Implement locale-aware user profile generation.
-// Current implementation returns a hardcoded test value and ignores the
-// locale parameter. Future implementation should:
-// 1. Load a USER_GENERATION.md prompt template with locale context
-// 2. Perform LLM inference with locale-specific username/bio generation
-// 3. Parse and validate JSON output with retry handling (similar to brewery)
-// 4. Return locale-aware username and biography
-UserResult LlamaGenerator::GenerateUser(const std::string& locale) {
-  return {.username = "test_user",
-          .bio = std::format("This is a test user profile from {}.", locale)};
+// GBNF grammar for structured user JSON output.
+static constexpr std::string_view kUserJsonGrammar = R"json_user(
+root ::= thought-block "{" ws "\"username\"" ws ":" ws string ws "," ws "\"bio\"" ws ":" ws string ws "," ws "\"activity_weight\"" ws ":" ws number ws "}" ws
+thought-block ::= [^{]*
+ws ::= [ \t\n\r]*
+string ::= "\"" char+ "\""
+char ::= [^"\\\x7F\x00-\x1F] | [\\] escape
+escape ::= ["\\/bfnrt] | "u" hex hex hex hex
+hex ::= [0-9a-fA-F]
+number ::= "-"? ("0" | [1-9] [0-9]*) ("." [0-9]+)?
+)json_user";
+
+static constexpr int kUserInitialMaxTokens = 1200;
+
+UserResult LlamaGenerator::GenerateUser(const EnrichedCity& city,
+                                        const UserPersona& persona,
+                                        const Name& name) {
+  std::string style_affinities;
+  for (const std::string& style : persona.style_affinities) {
+    if (!style_affinities.empty()) {
+      style_affinities += ", ";
+    }
+    style_affinities += style;
+  }
+
+  const std::string system_prompt = prompt_directory_->Load("USER_GENERATION");
+
+  std::string user_prompt = std::format(
+      "## NAME:\n{} {}\n\n## GENDER:\n{}\n\n## CITY:\n{}\n\n## COUNTRY:\n{}\n\n"
+      "## PERSONA:\n{}\n\n## PERSONA DESCRIPTION:\n{}\n\n## STYLE "
+      "AFFINITIES:\n{}",
+      name.first_name, name.last_name, name.gender, city.location.city,
+      city.location.country, persona.name, persona.description,
+      style_affinities);
+
+  const std::string retry_context =
+      std::format("Name: {} {}\nCity: {}, {}\nPersona: {}", name.first_name,
+                 name.last_name, city.location.city, city.location.country,
+                 persona.name);
+
+  constexpr int max_attempts = 3;
+  std::string raw;
+  std::string last_error;
+  int max_tokens = kUserInitialMaxTokens;
+
+  for (int attempt = 0; attempt < max_attempts; ++attempt) {
+    raw = this->Infer(system_prompt, user_prompt, max_tokens,
+                      kUserJsonGrammar);
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Debug,
+           .phase = PipelinePhase::UserGeneration,
+           .message = std::format("LlamaGenerator: raw output (attempt {}): {}",
+                      attempt + 1, raw)});
+    }
+
+    UserResult user;
+    const std::optional<std::string> validation_error =
+        ValidateUserJson(raw, user);
+
+    if (!validation_error.has_value()) {
+      if (logger_) {
+        logger_->Log(
+            {.level = LogLevel::Info,
+             .phase = PipelinePhase::UserGeneration,
+             .message = std::format("LlamaGenerator: successfully generated user data on attempt {}",
+                        attempt + 1)});
+      }
+
+      user.first_name = name.first_name;
+      user.last_name = name.last_name;
+      user.gender = name.gender;
+      return user;
+    }
+
+    last_error = *validation_error;
+    if (logger_) {
+      logger_->Log(
+          {.level = LogLevel::Warn,
+           .phase = PipelinePhase::UserGeneration,
+           .message =
+               std::format("LlamaGenerator: malformed user JSON (attempt {}): {}",
+               attempt + 1, *validation_error)});
+    }
+
+    user_prompt = std::format(
+        "Your previous response was invalid. Error: {}\nReturn the thought "
+        "process before the JSON if needed, then return ONLY valid JSON with "
+        "exactly these keys, in this exact order: {{\"username\": \"<handle "
+        "derived from the given name>\", \"bio\": \"<first-person bio "
+        "grounded in the persona>\", \"activity_weight\": <number between 0 "
+        "and 1>}}.\nDo not include markdown, comments, extra keys, or "
+        "literal placeholder values.\n\n{}",
+        *validation_error, retry_context);
+  }
+
+  if (logger_) {
+    logger_->Log(
+        {.level = LogLevel::Error,
+         .phase = PipelinePhase::UserGeneration,
+       .message = std::format(
+         "LlamaGenerator: malformed user response after {} attempts: {}",
+         max_attempts, last_error.empty() ? raw : last_error)});
+  }
+  throw std::runtime_error("LlamaGenerator: malformed user response");
 }

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

@@ -91,6 +91,22 @@ bool HasSchemaPlaceholder(const std::array<std::string*, 4>& values) {
 
   return false;
 }
+
+bool HasSchemaPlaceholder(const std::array<std::string*, 2>& 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
 
 /**
@@ -207,3 +223,58 @@ std::optional<std::string> ValidateBreweryJson(const std::string& raw,
 
   return std::nullopt;
 }
+
+std::optional<std::string> ValidateUserJson(const std::string& raw,
+                                            UserResult& user_out) {
+  boost::system::error_code error_code;
+  const std::string_view raw_view(raw);
+  const size_t opening_brace = raw_view.find('{');
+  if (opening_brace == std::string_view::npos) {
+    return "JSON parse error: missing opening brace '{'";
+  }
+
+  const std::string_view json_payload = raw_view.substr(opening_brace);
+  boost::json::value json_value = boost::json::parse(json_payload, error_code);
+  if (error_code) {
+    return "JSON parse error: " + error_code.message();
+  }
+
+  if (!json_value.is_object()) {
+    return "JSON root must be an object";
+  }
+
+  const auto& obj = json_value.get_object();
+  if (obj.size() != 3) {
+    return "JSON object must contain exactly three keys";
+  }
+
+  std::string validation_error;
+  if (!ReadRequiredTrimmedStringField(obj, "username", user_out.username,
+                                      &validation_error)) {
+    return validation_error;
+  }
+
+  if (!ReadRequiredTrimmedStringField(obj, "bio", user_out.bio,
+                                      &validation_error)) {
+    return validation_error;
+  }
+
+  const boost::json::value* activity_weight_field =
+      obj.if_contains("activity_weight");
+  if (activity_weight_field == nullptr || !activity_weight_field->is_number()) {
+    return "Missing or invalid numeric field: activity_weight";
+  }
+
+  const double activity_weight = activity_weight_field->to_number<double>();
+  if (activity_weight < 0.0 || activity_weight > 1.0) {
+    return "activity_weight must be between 0 and 1";
+  }
+  user_out.activity_weight = static_cast<float>(activity_weight);
+
+  const std::array schema_placeholders = {&user_out.username, &user_out.bio};
+  if (HasSchemaPlaceholder(schema_placeholders)) {
+    return "JSON appears to be a schema placeholder, not content";
+  }
+
+  return std::nullopt;
+}

tooling/pipeline/src/data_generation/mock/deterministic_hash.cc

@@ -14,3 +14,13 @@ size_t MockGenerator::DeterministicHash(const Location& location) {
   boost::hash_combine(seed, location.country);
   return seed;
 }
+
+size_t MockGenerator::DeterministicHash(const Location& location,
+                                        const UserPersona& persona,
+                                        const Name& name) {
+  size_t seed = DeterministicHash(location);
+  boost::hash_combine(seed, persona.name);
+  boost::hash_combine(seed, name.first_name);
+  boost::hash_combine(seed, name.last_name);
+  return seed;
+}

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

@@ -1,22 +1,31 @@
 /**
  * @file data_generation/mock/generate_user.cc
- * @brief Generates deterministic mock user profiles by hashing locale values
- * into predefined username and bio collections.
+ * @brief Generates deterministic mock user profiles by hashing city, persona,
+ * and sampled name into predefined username and bio collections.
  */
 
-#include <functional>
-#include <string>
 #include <string_view>
 
 #include "data_generation/mock_generator.h"
 
-UserResult MockGenerator::GenerateUser(const std::string& locale) {
-  const size_t hash = std::hash<std::string>{}(locale);
+UserResult MockGenerator::GenerateUser(const EnrichedCity& city,
+                                       const UserPersona& persona,
+                                       const Name& name) {
+  const size_t hash = DeterministicHash(city.location, persona, name);
 
-  UserResult result;
   const std::string_view username = kUsernames[hash % kUsernames.size()];
   const std::string_view bio = kBios[hash / kBioHashStride % kBios.size()];
-  result.username = username;
-  result.bio = bio;
-  return result;
+  const float activity_weight =
+      static_cast<float>(hash / kActivityWeightHashStride %
+                         kActivityWeightHashRange) /
+      static_cast<float>(kActivityWeightHashRange);
+
+  return {
+      .first_name = name.first_name,
+      .last_name = name.last_name,
+      .gender = name.gender,
+      .username = std::string(username),
+      .bio = std::string(bio),
+      .activity_weight = activity_weight,
+  };
 }

tooling/pipeline/src/data_model/names_by_country.cc

@@ -0,0 +1,41 @@
+/**
+ * @file data_model/names_by_country.cc
+ * @brief NamesByCountry::SampleName() implementation.
+ */
+
+#include "data_model/names_by_country.h"
+
+#include <utility>
+
+NamesByCountry::NamesByCountry(
+    std::unordered_map<std::string, std::vector<ForenameEntry>>
+        forenames_by_country,
+    std::unordered_map<std::string, std::vector<std::string>>
+        surnames_by_country)
+    : forenames_by_country_(std::move(forenames_by_country)),
+      surnames_by_country_(std::move(surnames_by_country)) {}
+
+std::optional<Name> NamesByCountry::SampleName(const std::string& iso3166_1,
+                                               std::mt19937& rng) const {
+  const auto forenames_it = forenames_by_country_.find(iso3166_1);
+  const auto surnames_it = surnames_by_country_.find(iso3166_1);
+
+  if (forenames_it == forenames_by_country_.end() ||
+      surnames_it == surnames_by_country_.end() ||
+      forenames_it->second.empty() || surnames_it->second.empty()) {
+    return std::nullopt;
+  }
+
+  const std::vector<ForenameEntry>& forenames = forenames_it->second;
+  const std::vector<std::string>& surnames = surnames_it->second;
+
+  std::uniform_int_distribution<size_t> forename_dist(0,
+                                                       forenames.size() - 1);
+  std::uniform_int_distribution<size_t> surname_dist(0, surnames.size() - 1);
+
+  const ForenameEntry& forename = forenames[forename_dist(rng)];
+
+  return Name{.first_name = forename.name,
+              .last_name = surnames[surname_dist(rng)],
+              .gender = forename.gender};
+}

tooling/pipeline/src/json_handling/json_loader.cc

@@ -16,6 +16,8 @@
 #include <stdexcept>
 #include <string>
 #include <string_view>
+#include <unordered_map>
+#include <utility>
 
 static std::string ReadRequiredString(const boost::json::object& object,
                                       const char* key) {
@@ -59,6 +61,50 @@ static std::vector<std::string> ReadRequiredStringArray(
   return items;
 }
 
+namespace {
+
+boost::json::value ParseJsonFile(const std::filesystem::path& filepath,
+                                 const char* what) {
+  std::ifstream input(filepath);
+  if (!input.is_open()) {
+    throw std::runtime_error(std::format("Failed to open {} file: {}", what,
+                                         filepath.string()));
+  }
+
+  std::stringstream buffer;
+  buffer << input.rdbuf();
+
+  boost::system::error_code error;
+  boost::json::value root = boost::json::parse(buffer.str(), error);
+  if (error) {
+    throw std::runtime_error(
+        std::format("Failed to parse {} JSON: {}", what, error.message()));
+  }
+  return root;
+}
+
+/// @brief Returns the first element of a string array field, falling back to
+/// `fallback_key` if `key` is missing/empty (some source entries only have a
+/// "localized" form and no "romanized" form).
+std::string ReadFirstOfStringArray(const boost::json::object& object,
+                                   const char* key,
+                                   const char* fallback_key) {
+  for (const char* candidate_key : {key, fallback_key}) {
+    const boost::json::value* value = object.if_contains(candidate_key);
+    if (value == nullptr || !value->is_array()) {
+      continue;
+    }
+    const auto& array = value->as_array();
+    if (!array.empty() && array.front().is_string()) {
+      return std::string(array.front().as_string());
+    }
+  }
+  throw std::runtime_error(
+      std::format("Missing or invalid string array field: {}", key));
+}
+
+}  // namespace
+
 std::vector<Location> JsonLoader::LoadLocations(
     const std::filesystem::path& filepath, std::shared_ptr<ILogger> logger) {
   std::ifstream input(filepath);
@@ -108,3 +154,100 @@ std::vector<Location> JsonLoader::LoadLocations(
 
   return locations;
 }
+
+std::vector<UserPersona> JsonLoader::LoadPersonas(
+    const std::filesystem::path& filepath, std::shared_ptr<ILogger> logger) {
+  const boost::json::value root = ParseJsonFile(filepath, "personas");
+
+  if (!root.is_array()) {
+    throw std::runtime_error(
+        "Invalid personas JSON: root element must be an array");
+  }
+
+  std::vector<UserPersona> personas;
+  const auto& items = root.as_array();
+  personas.reserve(items.size());
+
+  for (const auto& item : items) {
+    if (!item.is_object()) {
+      throw std::runtime_error(
+          "Invalid personas JSON: each entry must be an object");
+    }
+
+    const auto& object = item.as_object();
+    personas.push_back(UserPersona{
+        .name = ReadRequiredString(object, "name"),
+        .description = ReadRequiredString(object, "description"),
+        .style_affinities =
+            ReadRequiredStringArray(object, "style_affinities"),
+    });
+  }
+
+  return personas;
+}
+
+NamesByCountry JsonLoader::LoadNamesByCountry(
+    const std::filesystem::path& forenames_filepath,
+    const std::filesystem::path& surnames_filepath,
+    std::shared_ptr<ILogger> logger) {
+  const boost::json::value forenames_root =
+      ParseJsonFile(forenames_filepath, "forenames-by-country");
+  const boost::json::value surnames_root =
+      ParseJsonFile(surnames_filepath, "surnames-by-country");
+
+  if (!forenames_root.is_object() || !surnames_root.is_object()) {
+    throw std::runtime_error(
+        "Invalid names-by-country JSON: root element must be an object "
+        "keyed by ISO 3166-1 country code");
+  }
+
+  std::unordered_map<std::string, std::vector<ForenameEntry>>
+      forenames_by_country;
+  for (const auto& [country_code, regions] : forenames_root.as_object()) {
+    if (!regions.is_array()) {
+      continue;
+    }
+    std::vector<ForenameEntry> entries;
+    for (const auto& region : regions.as_array()) {
+      if (!region.is_object()) {
+        continue;
+      }
+      const boost::json::value* names = region.as_object().if_contains("names");
+      if (names == nullptr || !names->is_array()) {
+        continue;
+      }
+      for (const auto& name_value : names->as_array()) {
+        if (!name_value.is_object()) {
+          continue;
+        }
+        const auto& name_object = name_value.as_object();
+        entries.push_back(ForenameEntry{
+            .name = ReadFirstOfStringArray(name_object, "romanized",
+                                           "localized"),
+            .gender = ReadRequiredString(name_object, "gender"),
+        });
+      }
+    }
+    forenames_by_country.emplace(country_code, std::move(entries));
+  }
+
+  std::unordered_map<std::string, std::vector<std::string>>
+      surnames_by_country;
+  for (const auto& [country_code, name_entries] : surnames_root.as_object()) {
+    if (!name_entries.is_array()) {
+      continue;
+    }
+    std::vector<std::string> surnames;
+    for (const auto& name_value : name_entries.as_array()) {
+      if (!name_value.is_object()) {
+        continue;
+      }
+      surnames.push_back(ReadFirstOfStringArray(name_value.as_object(),
+                                                "romanized", "localized"));
+    }
+    surnames_by_country.emplace(country_code, std::move(surnames));
+  }
+
+  return NamesByCountry(std::move(forenames_by_country),
+                        std::move(surnames_by_country));
+}

tooling/pipeline/src/main.cc

@@ -53,6 +53,7 @@ int main(const int argc, char** argv) {
       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();