PRAGMA foreign_keys=ON;

CREATE TABLE IF NOT EXISTS task_lineage_supersessions (
  source_task_id TEXT NOT NULL,
  supersession_ordinal INTEGER NOT NULL CHECK (supersession_ordinal = 1),
  child_task_id TEXT NOT NULL UNIQUE,
  source_task_identity_sha256 TEXT NOT NULL,
  source_metadata_sha256 TEXT NOT NULL,
  owner_decision_sha256 TEXT NOT NULL UNIQUE,
  decision_id TEXT NOT NULL UNIQUE,
  created_at TEXT NOT NULL,
  PRIMARY KEY (source_task_id, supersession_ordinal)
);

CREATE TABLE IF NOT EXISTS task_lineage_supersession_receipts (
  decision_id TEXT PRIMARY KEY,
  nonce TEXT NOT NULL UNIQUE,
  source_task_id TEXT NOT NULL,
  supersession_ordinal INTEGER NOT NULL,
  child_task_id TEXT NOT NULL UNIQUE,
  owner_decision_sha256 TEXT NOT NULL UNIQUE,
  decision_json TEXT NOT NULL,
  receipt_json TEXT NOT NULL,
  consumed_at TEXT NOT NULL,
  FOREIGN KEY (source_task_id, supersession_ordinal)
    REFERENCES task_lineage_supersessions(source_task_id, supersession_ordinal)
);

CREATE TABLE IF NOT EXISTS task_claim_guard_bindings_v2 (
  binding_id TEXT PRIMARY KEY,
  task_id TEXT NOT NULL UNIQUE,
  source_task_id TEXT NOT NULL,
  supersession_ordinal INTEGER NOT NULL,
  expected_revision INTEGER NOT NULL CHECK (expected_revision >= 1),
  metadata_sha256 TEXT NOT NULL,
  required_capabilities_sha256 TEXT NOT NULL,
  worker_id TEXT NOT NULL,
  execution_digest TEXT NOT NULL,
  repository TEXT NOT NULL,
  target_branch TEXT NOT NULL,
  generation INTEGER NOT NULL,
  policy_json TEXT NOT NULL,
  policy_sha256 TEXT NOT NULL,
  binding_json TEXT NOT NULL,
  binding_sha256 TEXT NOT NULL UNIQUE,
  created_at TEXT NOT NULL,
  FOREIGN KEY (source_task_id, supersession_ordinal)
    REFERENCES task_lineage_supersessions(source_task_id, supersession_ordinal)
);

CREATE TABLE IF NOT EXISTS task_claim_guard_binding_receipts_v2 (
  receipt_id TEXT PRIMARY KEY,
  binding_id TEXT NOT NULL UNIQUE,
  task_id TEXT NOT NULL UNIQUE,
  receipt_json TEXT NOT NULL,
  receipt_sha256 TEXT NOT NULL UNIQUE,
  created_at TEXT NOT NULL,
  FOREIGN KEY (binding_id) REFERENCES task_claim_guard_bindings_v2(binding_id)
);

CREATE TRIGGER IF NOT EXISTS task_lineage_supersessions_no_update
BEFORE UPDATE ON task_lineage_supersessions BEGIN
  SELECT RAISE(ABORT, 'TASK_LINEAGE_SUPERSESSION_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_lineage_supersessions_no_delete
BEFORE DELETE ON task_lineage_supersessions BEGIN
  SELECT RAISE(ABORT, 'TASK_LINEAGE_SUPERSESSION_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_lineage_supersession_receipts_no_update
BEFORE UPDATE ON task_lineage_supersession_receipts BEGIN
  SELECT RAISE(ABORT, 'TASK_LINEAGE_SUPERSESSION_RECEIPT_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_lineage_supersession_receipts_no_delete
BEFORE DELETE ON task_lineage_supersession_receipts BEGIN
  SELECT RAISE(ABORT, 'TASK_LINEAGE_SUPERSESSION_RECEIPT_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_claim_guard_bindings_v2_no_update
BEFORE UPDATE ON task_claim_guard_bindings_v2 BEGIN
  SELECT RAISE(ABORT, 'TASK_CLAIM_GUARD_BINDING_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_claim_guard_bindings_v2_no_delete
BEFORE DELETE ON task_claim_guard_bindings_v2 BEGIN
  SELECT RAISE(ABORT, 'TASK_CLAIM_GUARD_BINDING_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_claim_guard_binding_receipts_v2_no_update
BEFORE UPDATE ON task_claim_guard_binding_receipts_v2 BEGIN
  SELECT RAISE(ABORT, 'TASK_CLAIM_GUARD_BINDING_RECEIPT_APPEND_ONLY');
END;
CREATE TRIGGER IF NOT EXISTS task_claim_guard_binding_receipts_v2_no_delete
BEFORE DELETE ON task_claim_guard_binding_receipts_v2 BEGIN
  SELECT RAISE(ABORT, 'TASK_CLAIM_GUARD_BINDING_RECEIPT_APPEND_ONLY');
END;