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Persists per-username failed-attempt counts and computed locked_until timestamps. Lockout service computes exponential-backoff durations (min(base * 2^(count-threshold), max)) with auto-unlock once locked_until passes. Successful login deletes the row, resetting the counter. Pure DB-keyed lockout — survives server restarts and shares state across both login routes (HTML and JSON) when wired in a later step.