bugfix

migrations/0015_fix_issue_workspace_fk.down.sql

@@ -0,0 +1,24 @@
+-- Revert to the original (buggy) bare ON DELETE SET NULL composite FKs so that
+-- this migration is a faithful inverse of 0015 up. Constraint names and column
+-- references match the definitions in 0003_workspace.up.sql and 0006_acp.up.sql.
+
+-- ============ acp_sessions -> requirements ============
+ALTER TABLE acp_sessions DROP CONSTRAINT acp_sessions_req_project_fk;
+ALTER TABLE acp_sessions ADD CONSTRAINT acp_sessions_req_project_fk
+  FOREIGN KEY (project_id, requirement_id)
+  REFERENCES requirements (project_id, id) MATCH SIMPLE
+  ON DELETE SET NULL;
+
+-- ============ acp_sessions -> issues ============
+ALTER TABLE acp_sessions DROP CONSTRAINT acp_sessions_issue_project_fk;
+ALTER TABLE acp_sessions ADD CONSTRAINT acp_sessions_issue_project_fk
+  FOREIGN KEY (project_id, issue_id)
+  REFERENCES issues (project_id, id) MATCH SIMPLE
+  ON DELETE SET NULL;
+
+-- ============ issues -> workspaces ============
+ALTER TABLE issues DROP CONSTRAINT issues_project_workspace_fk;
+ALTER TABLE issues ADD CONSTRAINT issues_project_workspace_fk
+  FOREIGN KEY (project_id, workspace_id)
+  REFERENCES workspaces (project_id, id) MATCH SIMPLE
+  ON DELETE SET NULL;