-- memo_share stores per-memo share grants (one row per share link).
-- uid is the opaque bearer token included in the share URL.
-- ON DELETE CASCADE ensures grants are cleaned up when the parent memo is deleted.
CREATE TABLE memo_share (
  id         INTEGER PRIMARY KEY AUTOINCREMENT,
  uid        TEXT    NOT NULL UNIQUE,
  memo_id    INTEGER NOT NULL,
  creator_id INTEGER NOT NULL,
  created_ts BIGINT  NOT NULL DEFAULT (strftime('%s', 'now')),
  expires_ts BIGINT  DEFAULT NULL,
  FOREIGN KEY (memo_id) REFERENCES memo(id) ON DELETE CASCADE
);

CREATE INDEX idx_memo_share_memo_id ON memo_share(memo_id);