Link OTC sales to market days

db/migrations/0027_otc_market_link.sql

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+BEGIN;
+
+ALTER TABLE sales_order
+  ADD COLUMN market_occurrence_id BIGINT,
+  ADD COLUMN market_occurrence_day_id BIGINT;
+
+ALTER TABLE market_occurrence_day
+  ADD CONSTRAINT uq_market_occurrence_day_occurrence_id UNIQUE (occurrence_id, id);
+
+ALTER TABLE sales_order
+  ADD CONSTRAINT fk_sales_order_market_occurrence
+    FOREIGN KEY (market_occurrence_id)
+    REFERENCES market_occurrence (id)
+    ON DELETE RESTRICT,
+  ADD CONSTRAINT fk_sales_order_market_occurrence_day
+    FOREIGN KEY (market_occurrence_id, market_occurrence_day_id)
+    REFERENCES market_occurrence_day (occurrence_id, id)
+    ON DELETE RESTRICT,
+  ADD CONSTRAINT chk_sales_order_market_link_complete
+    CHECK ((market_occurrence_id IS NULL) = (market_occurrence_day_id IS NULL));
+
+CREATE INDEX idx_sales_order_market_occurrence
+  ON sales_order (market_occurrence_id);
+
+CREATE INDEX idx_sales_order_market_occurrence_day
+  ON sales_order (market_occurrence_day_id);
+
+COMMIT;