diff --git a/scripts/lib/cli.mjs b/scripts/lib/cli.mjs
index 144a4e9d..5733573b 100644
--- a/scripts/lib/cli.mjs
+++ b/scripts/lib/cli.mjs
@@ -7,6 +7,7 @@
  * any of these re-spelled outside this module.
  */
 import { createHash } from 'node:crypto'
+import { readFileSync } from 'node:fs'
 import { access, mkdir, readFile, writeFile } from 'node:fs/promises'
 import { createRequire } from 'node:module'
 import { dirname, join } from 'node:path'
@@ -31,6 +32,44 @@ export const loadCliEnv = () => {
 /** Local database hosts — including the docker-compose service name. THE one list. */
 export const LOCAL_HOSTS = new Set(['localhost', '127.0.0.1', '0.0.0.0', '::1', 'postgres'])
 
+/**
+ * Gateway of the default route, read from /proc/net/route (Linux). The
+ * self-hosted Forgejo runner publishes each job's `services:` Postgres on the
+ * bridge gateway IP (192.168.x.1 — differs per job), so a job reaches it via
+ * that IP instead of localhost. The same octet order the ci-pr.yml awk
+ * produces (the /proc fields are little-endian). Returns null when there is
+ * no default route or the file is unreadable (macOS/Windows dev boxes).
+ */
+export const defaultGatewayHost = () => {
+  try {
+    const routes = readFileSync('/proc/net/route', 'utf8').split('\n')
+    for (const line of routes) {
+      const fields = line.trim().split(/\s+/)
+      if (fields[1] !== '00000000') continue
+      const hex = fields[2] ?? ''
+      if (hex === '00000000' || hex.length < 8) return null
+      const octets = [
+        parseInt(hex.slice(6, 8), 16),
+        parseInt(hex.slice(4, 6), 16),
+        parseInt(hex.slice(2, 4), 16),
+        parseInt(hex.slice(0, 2), 16),
+      ]
+      const isRfc1918 =
+        octets[0] === 10 ||
+        (octets[0] === 172 && octets[1] >= 16 && octets[1] <= 31) ||
+        (octets[0] === 192 && octets[1] === 168)
+      if (!isRfc1918) return null
+      return octets.join('.')
+    }
+  } catch {
+    // /proc/net/route is Linux-only; fall through to the static list.
+  }
+  return null
+}
+
+const gatewayHost = defaultGatewayHost()
+if (gatewayHost) LOCAL_HOSTS.add(gatewayHost)
+
 export const ALLOW_REMOTE_DB_FLAG = 'ALLOW_REMOTE_DB'
 
 export const isRemoteDbOverrideSet = () =>
diff --git a/tests/helpers/assertTestDatabase.ts b/tests/helpers/assertTestDatabase.ts
index cbd83a38..38b2bd3d 100644
--- a/tests/helpers/assertTestDatabase.ts
+++ b/tests/helpers/assertTestDatabase.ts
@@ -12,6 +12,11 @@
 /** `teqo_test`, `teqo_wt15_test`, … — the _test suffix is the hard contract. */
 const TEST_DATABASE_NAME = /^teqo(_[a-z0-9]+)?_test$/
 
+// Self-hosted Forgejo runner: the job's postgres service is published on the
+// bridge gateway IP (RFC1918), not localhost. Same source as the CLI guard so
+// both guards admit exactly the same hosts (OPS50).
+import { defaultGatewayHost } from '../../scripts/lib/cli.mjs'
+
 export function assertTestDatabase(databaseUrl: string | undefined): void {
   if (!databaseUrl) {
     throw new Error(
@@ -29,6 +34,8 @@ export function assertTestDatabase(databaseUrl: string | undefined): void {
 
   const databaseName = decodeURIComponent(parsedUrl.pathname.replace(/^\//, ''))
   const localHosts = new Set(['localhost', '127.0.0.1', '::1', '[::1]'])
+  const gateway = defaultGatewayHost()
+  if (gateway) localHosts.add(gateway)
 
   if (
     parsedUrl.protocol !== 'postgresql:' ||
diff --git a/tests/unit/localHosts.unit.spec.ts b/tests/unit/localHosts.unit.spec.ts
new file mode 100644
index 00000000..a15331d2
--- /dev/null
+++ b/tests/unit/localHosts.unit.spec.ts
@@ -0,0 +1,28 @@
+// @vitest-environment node
+
+import { describe, expect, it } from 'vitest'
+
+import { defaultGatewayHost, LOCAL_HOSTS } from '../../scripts/lib/cli.mjs'
+
+describe('LOCAL_HOSTS (OPS50 — self-hosted runner reaches services via the bridge gateway)', () => {
+  it('still contains the canonical static hosts', () => {
+    for (const host of ['localhost', '127.0.0.1', '0.0.0.0', '::1', 'postgres']) {
+      expect(LOCAL_HOSTS.has(host)).toBe(true)
+    }
+  })
+
+  it('admits the machine default gateway when it is RFC1918 (Linux CI bridge)', () => {
+    const gateway = defaultGatewayHost()
+    if (gateway) {
+      // The Forgejo runner publishes the job's postgres service on the bridge
+      // gateway IP; assertLocalDatabase must accept it so seeds run in CI.
+      expect(LOCAL_HOSTS.has(gateway)).toBe(true)
+    }
+  })
+
+  it('never admits public or loopback hosts', () => {
+    expect(LOCAL_HOSTS.has('8.8.8.8')).toBe(false)
+    expect(LOCAL_HOSTS.has('127.0.0.2')).toBe(false)
+    expect(LOCAL_HOSTS.has('203.0.113.1')).toBe(false)
+  })
+})