diff --git a/app/seed/evolution_tracks.py b/app/seed/evolution_tracks.py
index 3875a95..3314a97 100644
--- a/app/seed/evolution_tracks.py
+++ b/app/seed/evolution_tracks.py
@@ -9,10 +9,13 @@ Can be run standalone:
 """
 
 import json
+import logging
 from pathlib import Path
 
 from app.db_engine import EvolutionTrack
 
+logger = logging.getLogger(__name__)
+
 _JSON_PATH = Path(__file__).parent / "evolution_tracks.json"
 
 
@@ -50,13 +53,14 @@ def seed_evolution_tracks() -> list[EvolutionTrack]:
             track.save()
 
         action = "created" if created else "updated"
-        print(f"  [{action}] {track.name} (card_type={track.card_type})")
+        logger.info("[%s] %s (card_type=%s)", action, track.name, track.card_type)
         results.append(track)
 
     return results
 
 
 if __name__ == "__main__":
-    print("Seeding evolution tracks...")
+    logging.basicConfig(level=logging.INFO)
+    logger.info("Seeding evolution tracks...")
     tracks = seed_evolution_tracks()
-    print(f"Done. {len(tracks)} track(s) processed.")
+    logger.info("Done. %d track(s) processed.", len(tracks))
diff --git a/app/services/season_stats.py b/app/services/season_stats.py
index 0223965..46d7e13 100644
--- a/app/services/season_stats.py
+++ b/app/services/season_stats.py
@@ -129,7 +129,6 @@ def _build_pitching_groups(plays):
             "saves": 0,
             "holds": 0,
             "blown_saves": 0,
-            "is_start": False,
         }
     )
 
@@ -176,7 +175,6 @@ def _apply_decisions(pitching_groups, decisions):
                 "saves": 0,
                 "holds": 0,
                 "blown_saves": 0,
-                "is_start": False,
             }
 
         g = pitching_groups[key]
@@ -185,8 +183,6 @@ def _apply_decisions(pitching_groups, decisions):
         g["saves"] += decision.is_save
         g["holds"] += decision.hold
         g["blown_saves"] += decision.b_save
-        if decision.is_start:
-            g["is_start"] = True
 
 
 def _upsert_postgres(player_id, team_id, season, game_id, batting, pitching):
diff --git a/migrations/2026-03-17_add_evolution_tables.sql b/migrations/2026-03-17_add_evolution_tables.sql
index 8aedac3..5ab57aa 100644
--- a/migrations/2026-03-17_add_evolution_tables.sql
+++ b/migrations/2026-03-17_add_evolution_tables.sql
@@ -34,7 +34,7 @@ BEGIN;
 -- --------------------------------------------
 CREATE TABLE IF NOT EXISTS player_season_stats (
     id SERIAL PRIMARY KEY,
-    player_id INTEGER NOT NULL REFERENCES player(id) ON DELETE CASCADE,
+    player_id INTEGER NOT NULL REFERENCES player(player_id) ON DELETE CASCADE,
     team_id INTEGER NOT NULL REFERENCES team(id) ON DELETE CASCADE,
     season INTEGER NOT NULL,
     -- Batting stats
@@ -108,7 +108,7 @@ CREATE TABLE IF NOT EXISTS evolution_track (
 -- --------------------------------------------
 CREATE TABLE IF NOT EXISTS evolution_card_state (
     id SERIAL PRIMARY KEY,
-    player_id INTEGER NOT NULL REFERENCES player(id) ON DELETE CASCADE,
+    player_id INTEGER NOT NULL REFERENCES player(player_id) ON DELETE CASCADE,
     team_id INTEGER NOT NULL REFERENCES team(id) ON DELETE CASCADE,
     track_id INTEGER NOT NULL REFERENCES evolution_track(id) ON DELETE CASCADE,
     current_tier INTEGER NOT NULL DEFAULT 0,
diff --git a/ruff.toml b/ruff.toml
index 8f64624..0dbfb5e 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -1,2 +1,3 @@
 [lint]
+# db_engine.py uses `from peewee import *` intentionally — suppress star-import warnings
 ignore = ["F403", "F405"]
diff --git a/tests/test_season_stats_update.py b/tests/test_season_stats_update.py
index 94f40e5..cfa0dcf 100644
--- a/tests/test_season_stats_update.py
+++ b/tests/test_season_stats_update.py
@@ -121,7 +121,6 @@ def make_play(game, play_num, batter, batter_team, pitcher, pitcher_team, **stat
         ab=0,
         hit=0,
         run=0,
-        hr=0,
         double=0,
         triple=0,
         homerun=0,