+/- table definition

Query 

CREATE TABLE generated_codes  (
  id             INTEGER PRIMARY KEY AUTOINCREMENT,
  batch_id       INTEGER NOT NULL,
  code           TEXT NOT NULL UNIQUE,
  institution_id TEXT NOT NULL,
  valid_until    TEXT,
  used           INTEGER DEFAULT 0,
  used_by        TEXT,
  used_at        DATETIME,
  created_at     DATETIME DEFAULT (datetime('now'))
)
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