diff --git a/.env.example b/.env.example
index d6eb181ffb..60b5074e6e 100644
--- a/.env.example
+++ b/.env.example
@@ -84,6 +84,10 @@ PORT=20128
 # API_HOST=0.0.0.0
 # DASHBOARD_PORT=20128
 
+# Connection backpressure: cap concurrent in-flight chat connections (503 + Retry-After when full).
+# Used by: src/sse/utils/backpressure.ts — disabled when unset/0.
+# OMNI_MAX_CONCURRENT_CONNECTIONS=0
+
 # Port for the real-time WebSocket live monitoring server.
 # Used by: src/server/ws/liveServer.ts, src/app/api/v1/ws/route.ts
 # Default: 20132
@@ -2106,24 +2110,24 @@ QUOTA_STORE_DRIVER=sqlite              # sqlite | redis
 # BIFROST_API_KEY=
 # BIFROST_STREAMING_ENABLED=true
 # BIFROST_TIMEOUT_MS=30000
-
-# ─────────────────────────────────────────────────────────────────────────────
-# Account rotation config (operator-managed; consumed by open-sse/services/rotationConfig.ts)
-# Lets a supervising front-end mirror its rotation rules onto the backend's account-fallback
-# engine. All optional; defaults preserve the historical behavior.
-# ─────────────────────────────────────────────────────────────────────────────
-# OMNIROUTE_ROTATION_ENABLED=true
-# OMNIROUTE_ROTATION_RATE_LIMIT_RESET_SECONDS=0
-# OMNIROUTE_ROTATION_DISABLE_TAG_WITHOUT_RESET=true
-# OMNIROUTE_ROTATE_ON_429=true
-# OMNIROUTE_ROTATE_429_THRESHOLD=1
-# OMNIROUTE_ROTATE_429_WINDOW_SECONDS=120
-# OMNIROUTE_ROTATE_ON_500=true
-# OMNIROUTE_ROTATE_500_THRESHOLD=1
-# OMNIROUTE_ROTATE_500_WINDOW_SECONDS=120
-# OMNIROUTE_ROTATE_ON_502=true
-# OMNIROUTE_ROTATE_502_THRESHOLD=1
-# OMNIROUTE_ROTATE_502_WINDOW_SECONDS=120
-# OMNIROUTE_ROTATE_ON_400=false
-# OMNIROUTE_ROTATE_400_THRESHOLD=1
-# OMNIROUTE_ROTATE_400_WINDOW_SECONDS=120
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Account rotation config (operator-managed; consumed by open-sse/services/rotationConfig.ts)
+# Lets a supervising front-end mirror its rotation rules onto the backend's account-fallback
+# engine. All optional; defaults preserve the historical behavior.
+# ─────────────────────────────────────────────────────────────────────────────
+# OMNIROUTE_ROTATION_ENABLED=true
+# OMNIROUTE_ROTATION_RATE_LIMIT_RESET_SECONDS=0
+# OMNIROUTE_ROTATION_DISABLE_TAG_WITHOUT_RESET=true
+# OMNIROUTE_ROTATE_ON_429=true
+# OMNIROUTE_ROTATE_429_THRESHOLD=1
+# OMNIROUTE_ROTATE_429_WINDOW_SECONDS=120
+# OMNIROUTE_ROTATE_ON_500=true
+# OMNIROUTE_ROTATE_500_THRESHOLD=1
+# OMNIROUTE_ROTATE_500_WINDOW_SECONDS=120
+# OMNIROUTE_ROTATE_ON_502=true
+# OMNIROUTE_ROTATE_502_THRESHOLD=1
+# OMNIROUTE_ROTATE_502_WINDOW_SECONDS=120
+# OMNIROUTE_ROTATE_ON_400=false
+# OMNIROUTE_ROTATE_400_THRESHOLD=1
+# OMNIROUTE_ROTATE_400_WINDOW_SECONDS=120
diff --git a/changelog.d/maintenance/basereds-mechanical-2026-07-12.md b/changelog.d/maintenance/basereds-mechanical-2026-07-12.md
new file mode 100644
index 0000000000..f1ee83c06f
--- /dev/null
+++ b/changelog.d/maintenance/basereds-mechanical-2026-07-12.md
@@ -0,0 +1 @@
+- chore(base): re-export relayProbeStats from localDb (db-rules gate, #6909 follow-up) and document OMNI_MAX_CONCURRENT_CONNECTIONS in .env.example/ENVIRONMENT.md (env-doc gate, #6590 follow-up)
diff --git a/docs/reference/ENVIRONMENT.md b/docs/reference/ENVIRONMENT.md
index f6de10034b..bd8fe06946 100644
--- a/docs/reference/ENVIRONMENT.md
+++ b/docs/reference/ENVIRONMENT.md
@@ -122,6 +122,7 @@ OmniRoute uses **SQLite** (via `better-sqlite3`) for all persistence. These vari
 | `API_PORT`                                  | _(unset)_                      | `src/lib/runtime/ports.ts`                                               | When set, serves the `/v1/*` proxy API on this separate port.                                                                                                                                                                                                                                                                  |
 | `API_HOST`                                  | `0.0.0.0`                      | `src/lib/runtime/ports.ts`                                               | Bind address for the API port.                                                                                                                                                                                                                                                                                                 |
 | `DASHBOARD_PORT`                            | _(unset)_                      | `src/lib/runtime/ports.ts`                                               | When set, serves the Dashboard UI on this separate port.                                                                                                                                                                                                                                                                       |
+| `OMNI_MAX_CONCURRENT_CONNECTIONS`           | `0` _(disabled)_               | `src/sse/utils/backpressure.ts`                                          | Caps concurrent in-flight chat connections; requests over the cap get `503` with `Retry-After`. Positive integer enables the guard; unset/`0` disables it.                                                                                                                                                                     |
 | `PROD_DASHBOARD_PORT`                       | `20130`                        | `docker-compose.prod.yml`                                                | Host-side published port for the Dashboard in Docker production mode.                                                                                                                                                                                                                                                          |
 | `PROD_API_PORT`                             | `20131`                        | `docker-compose.prod.yml`                                                | Host-side published port for the API in Docker production mode.                                                                                                                                                                                                                                                                |
 | `OMNIROUTE_PORT`                            | _(unset)_                      | `src/lib/runtime/ports.ts`                                               | Takes precedence over `PORT` when running inside Electron or other wrappers.                                                                                                                                                                                                                                                   |
diff --git a/src/lib/localDb.ts b/src/lib/localDb.ts
index 5cc8b6a76e..46f2eb67cf 100755
--- a/src/lib/localDb.ts
+++ b/src/lib/localDb.ts
@@ -801,3 +801,4 @@ export { markConnectionRateLimitedUntil, clearConnectionRateLimit } from "./db/p
 // Provider param filters — denylist/allowlist config per provider/model (#6625)
 export * from "./db/paramFilters";
 export * from "./db/interceptionRules"; // Per-model web-search/web-fetch interception rules (#3384)
+export * from "./db/relayProbeStats"; // Relay probe latency/health stats (#6909)