Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/145_ops_metrics_ttft_sample_count.sql

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+-- Add ttft_sample_count to ops_metrics_hourly / ops_metrics_daily.
+--
+-- first_token_ms (TTFT) is only recorded for streaming requests, but the
+-- dashboard previously weighted merged TTFT percentiles by success_count
+-- (all successful requests, streaming + non-streaming). That diluted/skewed
+-- the merged TTFT figures whenever non-streaming traffic was present.
+--
+-- Store the real streaming sample count per bucket so TTFT percentiles can be
+-- weighted by the number of rows that actually contributed a first_token_ms.
+--
+-- Existing rows default to 0; they will be repopulated on the next hourly
+-- re-aggregation pass. Migration is idempotent and safe to re-run.
+
+SET LOCAL lock_timeout = '5s';
+SET LOCAL statement_timeout = '10min';
+
+ALTER TABLE ops_metrics_hourly
+    ADD COLUMN IF NOT EXISTS ttft_sample_count BIGINT NOT NULL DEFAULT 0;
+
+ALTER TABLE ops_metrics_daily
+    ADD COLUMN IF NOT EXISTS ttft_sample_count BIGINT NOT NULL DEFAULT 0;