Add occurrence checklist submodule

db/migrations/0034_market_occurrence_checklist.sql

@@ -0,0 +1,33 @@
+BEGIN;
+
+CREATE TABLE market_occurrence_checklist (
+  id BIGSERIAL PRIMARY KEY,
+  occurrence_id BIGINT NOT NULL UNIQUE REFERENCES market_occurrence(id) ON DELETE RESTRICT,
+  comment TEXT,
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE market_occurrence_checklist_item (
+  id BIGSERIAL PRIMARY KEY,
+  occurrence_id BIGINT NOT NULL REFERENCES market_occurrence(id) ON DELETE RESTRICT,
+  position INTEGER NOT NULL,
+  label TEXT NOT NULL,
+  is_completed BOOLEAN NOT NULL DEFAULT FALSE,
+  created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
+  CONSTRAINT chk_market_occurrence_checklist_item_position CHECK (position > 0)
+);
+
+CREATE INDEX idx_market_occurrence_checklist_item_occurrence
+  ON market_occurrence_checklist_item(occurrence_id, position, id);
+
+INSERT INTO market_occurrence_checklist (occurrence_id)
+SELECT id FROM market_occurrence;
+
+INSERT INTO market_occurrence_checklist_item (occurrence_id, position, label)
+SELECT occurrence_id, position, 'Position ' || position
+FROM market_occurrence_checklist
+CROSS JOIN generate_series(1, 30) AS positions(position);
+
+COMMIT;