+/- table definition

Query 

CREATE TABLE weixin_context_tokens  (
  id TEXT PRIMARY KEY,
  channel_id TEXT NOT NULL,
  peer_user_id TEXT NOT NULL,
  context_token TEXT NOT NULL,
  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
  FOREIGN KEY (channel_id) REFERENCES im_channels(id) ON DELETE CASCADE,
  UNIQUE(channel_id, peer_user_id)
)
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