### execution evidence
# The initial live attempt could not reach the local application.
# 2026-09-02T23:08:42.192Z navigation: http://localhost:44201 -> net::ERR_CONNECTION_RESET
# 2026-09-02T23:08:42.192Z test_end: blocked before legacy reservation setup or current-worker trigger
# The runner also recorded ECONNREFUSED for local Redis and MongoDB during service diagnosis.
# The mandated restart path exhausted its allowed attempts, so no live legacy Redis reservation or worker response was captured.

### migration scenario
# Intended test configuration: fixed throttle window, threshold 1, grouped reservation.
# Expected behavior: a current worker must recognize an active reservation written by the legacy worker, or the rollout must prevent mixed versions from exceeding the limit.

### current reservation key
# Source: libs/application-generic/src/services/throttle/redis-throttle.service.ts:96-107
private buildSetKey(params: {
  environmentId: string;
  subscriberId: string;
  workflowId: string;
  stepId: string;
  throttleValue?: string;
}): string {
  const baseKey = `throttle:${params.environmentId}:${params.subscriberId}:${params.workflowId}:${params.stepId}`;
  const groupingPart = params.throttleValue !== undefined ? `:${params.throttleValue}` : '';
  const finalKey = `${baseKey}${groupingPart}:set`;
  return finalKey;
}

### reservation call
# Source: libs/application-generic/src/services/throttle/redis-throttle.service.ts:175-182
const setKey = this.buildSetKey({
  environmentId: params.environmentId,
  subscriberId: params.subscriberId,
  workflowId: params.workflowId,
  stepId: params.stepId,
  throttleValue: params.throttleValue,
});
const ttlSec = this.computeTtlSeconds(params.windowMs);
const [granted, count, ttlSecRemaining] = await this.executeReserveScript(
  setKey, params.limit, ttlSec, params.jobId
);

### compatibility check
# Current RedisThrottleService reads the single key produced above.
# No legacy-key lookup, migration alias, or dual-key reservation/write path is present in the inspected service.
# A live reservation under the former key shape is therefore invisible to the current worker; with limit 1, the current worker can grant another reservation.
# The remediation assertion recorded: current code emits throttle:<environmentId>:<subscriberId>:<workflowId>:<stepId>[:<group>]:set, with no legacy namespace read.

### local test context
# A local-only authentication bypass was used for the trigger endpoint; no production services or customer data were used.
# final result: BF-MIGRATION-1 failed - mixed-version legacy reservations are not honored. The over-admission path is source-confirmed, while the live Redis setup was blocked by local service unavailability.