/**
 * Per-read-model kill switch — RFC-003 §0.
 *
 * Contract:
 *   - `isEnabled(name)` returns whether the named read model should
 *     serve queries. When `false`, callers MUST fail open to the
 *     write-model path.
 *   - Implementations MUST be hot-readable (no restart required).
 *   - The check is evaluated per-call so that a flag toggled mid-request
 *     is honoured on the NEXT repository call within the same request.
 *     In-flight calls complete against whichever source they already
 *     started on.
 */

export const READ_MODEL_KILL_SWITCH = Symbol('READ_MODEL_KILL_SWITCH');

export interface IReadModelKillSwitch {
  /**
   * Returns `true` when the named read model is active and safe to query.
   * Returns `true` (fail-open) for unknown / un-configured names so that
   * an absent config key never blocks the write-model fallback path.
   */
  isEnabled(readModelName: string): boolean;
}