docs: sync KB — card-evolution-phase1a-implementation.md

paper-dynasty/card-evolution-phase1a-implementation.md

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+---
+title: "Card Evolution Phase 1a — Schema & Data Foundation (dev branch)"
+description: "Phase 1a implementation details for Card Evolution on paper-dynasty-database card-evolution branch: 5 work packages, Peewee models, migration, seed data, season stats service"
+type: context
+domain: paper-dynasty
+tags: [paper-dynasty, evolution, database, peewee, migration, development]
+---
+
+# Card Evolution Phase 1a — Schema & Data Foundation
+
+**Status:** Merged into `card-evolution` dev branch (PR #104, 2026-03-18)
+**NOT deployed to production** — sitting on long-lived `card-evolution` branch on paper-dynasty-database repo.
+**Project plan:** `card-creation/docs/prd-evolution/PHASE1_PROJECT_PLAN.md`
+
+## What was implemented (5 work packages, 25+ tests)
+
+### WP-01: Evolution Peewee Models
+- 4 new models in `app/db_engine.py`: `EvolutionTrack`, `EvolutionCardState`, `EvolutionTierBoost`, `EvolutionCosmetic`
+- Uses `ModelIndex` + `add_index()` for composite unique constraints
+- Follows existing BaseModel pattern in the monolithic db_engine.py
+
+### WP-02: PlayerSeasonStats Model
+- 25 stat columns (14 batting + 11 pitching), all `IntegerField(default=0)`
+- FK to `StratGame` for `last_game` tracking (double-count prevention)
+- 3 indexes: unique (player, team, season) + 2 query indexes
+
+### WP-03: Track Seed Data
+- `app/seed/evolution_tracks.json` — 3 tracks (Batter, SP, RP) with formulas and thresholds
+- `app/seed/evolution_tracks.py` — idempotent `seed_evolution_tracks()` using get_or_create + update on rerun
+- Uses `logging.getLogger(__name__)` (not print)
+
+### WP-04: SQL Migration
+- `migrations/2026-03-17_add_evolution_tables.sql` — 5 new tables + 3 ALTER TABLE columns
+- `IF NOT EXISTS` pattern, `BEGIN/COMMIT` wrapping
+- **Critical fix:** FK references use `player(player_id)` not `player(id)` — Player PK is `player_id`
+
+### WP-05: Season Stats Service
+- `app/services/season_stats.py` — `update_season_stats(game_id)` entry point
+- Dual-backend upsert: PostgreSQL `ON CONFLICT ... DO UPDATE EXCLUDED` / SQLite `get_or_create` + field addition
+- Aggregates StratPlay rows into batting/pitching groups, merges Decision records
+- Double-count prevention via `last_game` check
+
+## Test infrastructure
+- `conftest.py` updated with all 5 new models in `_TEST_MODELS` and shared fixtures (`track`, extended `player`, `team`)
+- `ruff.toml` added with F403/F405 ignore for peewee star imports in db_engine.py
+- Tests use `DATABASE_TYPE=postgresql` env var + SQLite rebind pattern
+
+## Key technical decisions
+- **Player PK is `player_id`**, not `id` — all FKs must reference `player(player_id)`
+- **Career-scoped tiers** — permanent once earned, progress accumulates across seasons
+- **No retroactive backfill** — evolution launches fresh at Season 11, all T0
+- **Single metric per track** with escalating thresholds (no multi-milestone tiers)
+
+## What's next: Phase 1b — API & Evaluation Engine
+- WP-07: Card State API endpoints (issue #72)
+- WP-08: Evaluate endpoint / formula engine (issue #73)
+- WP-10: Pack opening hook — evolution_card_state init (issue #75)
+- WP-07 and WP-08 can be parallelized