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.github/instructions/database.md

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+# Database Instructions
+
+## Scope
+- Applies to GORM models in `internal/models` and migration behavior in `internal/database/database.go`.
+
+## Rules
+- Define explicit foreign keys for non-trivial relations (`foreignKey`, `references`) to avoid inference errors.
+- Avoid introducing `NOT NULL` constraints on existing populated tables without a backfill plan.
+- Keep `AutoMigrate` additive-first; prefer safe schema transitions over breaking changes.
+- Use deterministic ordering fields (`position`) for UI-driven entities (kanban sections/tasks).
+- Ensure seed data aligns with current schema and relation requirements.
+
+## Migration Safety
+- For legacy data, introduce nullable columns first, backfill, then tighten constraints in a later step.
+- Never assume empty tables in shared dev environments.