71a0016a4a
20260605122718_drop_wpo dropped uniq_wpo_user_date (the sole index covering the user_id FK) BEFORE creating idx_wpo_user_date, which MySQL rejects on a fresh apply ('Cannot drop index ... needed in a foreign key constraint'). Reordered so the replacement index exists first. This migration is not yet applied on production, so editing it is safe; the resulting index state is unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
27 lines
1.4 KiB
SQL
27 lines
1.4 KiB
SQL
-- Drop the unique index on (user_id, shift_date) for work_plan_overrides.
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-- MySQL unique indexes don't ignore soft-deleted rows, which would prevent
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-- createOverride from soft-deleting an existing override and creating a new
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-- one for the same (user_id, shift_date). Application code enforces the
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-- "at most one active override per (user_id, shift_date)" invariant.
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-- The application-level check is wrapped in a transaction; see
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-- src/services/plan.service.ts:createOverride.
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--
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-- The original index was created in
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-- 20260605120000_add_work_plan/migration.sql as `uniq_wpo_user_date`.
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-- IMPORTANT ordering: `uniq_wpo_user_date` is the only index covering the
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-- `user_id` foreign key, and MySQL refuses to drop an index still needed by a
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-- FK. So we CREATE the replacement non-unique index FIRST (giving the FK
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-- another covering index), THEN drop the unique one. The reverse order fails
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-- with "Cannot drop index ... needed in a foreign key constraint" on a fresh
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-- apply.
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-- Add a non-unique index for the (user_id, shift_date) lookup used by
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-- createOverride's "is there an active override for this user-day?" query
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-- and by resolveCell / resolveGrid. This is a plain index, not a unique
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-- one — multiple rows (active and soft-deleted) can share the same
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-- (user_id, shift_date) pair.
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CREATE INDEX `idx_wpo_user_date` ON `work_plan_overrides`(`user_id`, `shift_date`);
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DROP INDEX `uniq_wpo_user_date` ON `work_plan_overrides`;
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