init push

migrations/20260414_hems_operations_mission_link.sql

@@ -0,0 +1,35 @@
+ALTER TABLE hems_operations
+    ADD COLUMN IF NOT EXISTS mission_id BINARY(16) NULL;
+
+SET @fk_exists := (
+    SELECT COUNT(1)
+    FROM information_schema.table_constraints
+    WHERE table_schema = DATABASE()
+      AND table_name = 'hems_operations'
+      AND constraint_type = 'FOREIGN KEY'
+      AND constraint_name = 'fk_hems_operations_mission'
+);
+SET @fk_sql := IF(
+    @fk_exists = 0,
+    'ALTER TABLE hems_operations ADD CONSTRAINT fk_hems_operations_mission FOREIGN KEY (mission_id) REFERENCES missions(id) ON UPDATE CASCADE ON DELETE SET NULL',
+    'SELECT 1'
+);
+PREPARE stmt_fk FROM @fk_sql;
+EXECUTE stmt_fk;
+DEALLOCATE PREPARE stmt_fk;
+
+SET @idx_exists := (
+    SELECT COUNT(1)
+    FROM information_schema.statistics
+    WHERE table_schema = DATABASE()
+      AND table_name = 'hems_operations'
+      AND index_name = 'uidx_hems_operations_mission_id'
+);
+SET @idx_sql := IF(
+    @idx_exists = 0,
+    'ALTER TABLE hems_operations ADD UNIQUE INDEX uidx_hems_operations_mission_id (mission_id)',
+    'SELECT 1'
+);
+PREPARE stmt_idx FROM @idx_sql;
+EXECUTE stmt_idx;
+DEALLOCATE PREPARE stmt_idx;