bugfix

migrations/0025_issue_graph.up.sql

@@ -0,0 +1,34 @@
+-- Task decomposition + dependency graph (autonomy roadmap §10).
+-- Additive only (follows the existing convention where 0003/0015 patched issues).
+
+-- ============ issues: parent_id + priority ============
+-- parent_id: self-FK for subtask hierarchy. ON DELETE SET NULL so deleting a
+-- parent orphans (not cascades) its subtasks. CHECK forbids self-parent.
+ALTER TABLE issues
+  ADD COLUMN parent_id UUID REFERENCES issues(id) ON DELETE SET NULL;
+ALTER TABLE issues
+  ADD CONSTRAINT issues_parent_not_self CHECK (parent_id IS NULL OR parent_id <> id);
+
+-- priority: higher = scheduled sooner. 0..3 (0 default = normal).
+ALTER TABLE issues
+  ADD COLUMN priority INT NOT NULL DEFAULT 0;
+ALTER TABLE issues
+  ADD CONSTRAINT issues_priority_check CHECK (priority BETWEEN 0 AND 3);
+
+CREATE INDEX idx_issues_parent ON issues(parent_id) WHERE parent_id IS NOT NULL;
+
+-- ============ issue_dependencies ============
+-- Semantics: blocked_id is blocked-by blocker_id; blocked_id becomes ready only
+-- when blocker_id.status='closed'. project_id denormalized for scope/cycle scoping.
+CREATE TABLE issue_dependencies (
+  id          UUID PRIMARY KEY,
+  project_id  UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
+  blocked_id  UUID NOT NULL REFERENCES issues(id)   ON DELETE CASCADE,
+  blocker_id  UUID NOT NULL REFERENCES issues(id)   ON DELETE CASCADE,
+  created_by  UUID NOT NULL REFERENCES users(id)    ON DELETE RESTRICT,
+  created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (blocked_id, blocker_id),
+  CONSTRAINT issue_deps_not_self CHECK (blocked_id <> blocker_id)
+);
+CREATE INDEX idx_issue_deps_blocked ON issue_dependencies(blocked_id);
+CREATE INDEX idx_issue_deps_blocker ON issue_dependencies(blocker_id);