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+---
+id: 71256008-18b8-4206-a036-909fe11ce901
+type: workflow
+title: "PR review: paper-dynasty-database#45 — batch BattingCard/BattingCardRatings lookups (APPROVED)"
+tags: [pr-reviewer, paper-dynasty-database, python, peewee, performance, batch-query, sqlite]
+importance: 0.4
+confidence: 0.8
+created: "2026-03-03T23:48:28.060018+00:00"
+updated: "2026-03-03T23:48:28.060018+00:00"
+---
+
+## PR #45 — fix: batch BattingCard/BattingCardRatings lookups in lineup builder
+
+**Verdict:** APPROVED (could not post — Gitea blocks self-review)
+
+**Files reviewed:** `app/routers_v2/teams.py`
+
+**What the PR does:**
+- Before the position loop in `get_team_lineup`, batch-fetches all `BattingCard` rows for `legal_players ∪ backup_players` in one query
+- Batch-fetches all `BattingCardRatings` for those cards in a second query
+- Builds `_batting_cards_by_player` (player_id → BattingCard) and `_ratings_by_card_hand` (card_id → {hand → BattingCardRatings}) dicts
+- Rewrites `get_bratings()` closure to do O(1) dict lookups instead of 3 DB queries per player
+
+**Key correctness checks:**
+- Dict keys match: `battingcard_id` (FK integer) in ratings dict == `this_bcard.id` in lookup
+- Error behaviour preserved: missing card/ratings still raises AttributeError (caught by callers)
+- Empty guard: `if _batting_cards_by_player else []` prevents empty IN clause
+- Passing BattingCard model instances to Peewee `<<` is valid; PK extraction is automatic
+
+**Pre-existing issues noted (out of scope):**
+- Dead code block lines 544-576 (old batch approach, commented out)
+- `get_bratings()` call at line 537 not wrapped in try/except