diff --git a/docs/reference/spec-v01-postgres.md b/docs/reference/spec-v01-postgres.md
index e789aae..4acc536 100644
--- a/docs/reference/spec-v01-postgres.md
+++ b/docs/reference/spec-v01-postgres.md
@@ -83,7 +83,7 @@ Secret 名称和 key 可以在实现时按 Kubernetes 命名限制微调，但
 | --- | --- | --- |
 | Postgres durable store 规格 | 已定义 | 本文为 v0.1 存储权威。 |
 | StatefulSet/Service/PVC | 已实现/已通过主闭环 | `agentrun-v01-postgres` StatefulSet、Service 和 PVC 已由 GitOps runtime 提供，作为 `agentrun-v01` durable store。 |
-| migration ledger | 已实现/已通过主闭环 | `agentrun-mgr` 启动 Postgres adapter 时幂等创建 `agentrun_schema_migrations` 并记录 migration id/checksum；当前最新 migration 为 `004_v01_queue_q1`，用于新增 Q1 Queue task 与 read cursor 持久化；readiness 必须显示 migration ready。 |
+| migration ledger | 已实现/已通过主闭环 | `agentrun-mgr` 启动 Postgres adapter 时幂等创建 `agentrun_schema_migrations` 并记录 migration id/checksum；当前最新 migration 为 `005_v01_minimax_m3_backend_profile`，用于在不改写既有 migration checksum 的前提下新增 `minimax-m3` backend profile；readiness 必须显示 migration ready。 |
 | manager Postgres adapter | 已实现/已通过主闭环 | `agentrun-mgr` 通过 `DATABASE_URL` 启用 Postgres adapter，持久化 runs、commands、events、runners、runner_jobs、sessions、backends、leases、Queue task 和 read cursor；缺少 `DATABASE_URL` 时 live runtime fail fast，memory 只允许显式 self-test/dev。 |
 | health/readiness store 状态 | 已实现 | health/readiness 返回 adapter、reachable、migrationReady、migrationId、failureKind 和 redacted Secret 状态，不输出 DSN 明文。 |
 | file/sqlite durable store | 不采用 | 只可用于临时本地测试，不作为 v0.1 runtime truth。 |
diff --git a/src/common/backend-profiles.ts b/src/common/backend-profiles.ts
index 25b7f46..26e0e0b 100644
--- a/src/common/backend-profiles.ts
+++ b/src/common/backend-profiles.ts
@@ -102,8 +102,15 @@ export function backendCapabilities(): JsonRecord[] {
   return backendProfileSpecs.map(backendCapability);
 }
 
-export function backendCapabilitiesSqlValues(): string {
-  return backendProfileSpecs.map((spec) => {
+export function backendCapabilitiesSqlValues(profiles?: readonly BackendProfile[]): string {
+  const specs = profiles
+    ? profiles.map((profile) => {
+        const spec = backendProfileSpec(profile);
+        if (!spec) throw new Error(`unknown backend profile for SQL seed: ${profile}`);
+        return spec;
+      })
+    : backendProfileSpecs;
+  return specs.map((spec) => {
     const capabilities = JSON.stringify({
       backendKind: spec.backendKind,
       protocol: spec.protocol,
diff --git a/src/mgr/postgres-store.ts b/src/mgr/postgres-store.ts
index 057d877..e4ac6b6 100644
--- a/src/mgr/postgres-store.ts
+++ b/src/mgr/postgres-store.ts
@@ -119,7 +119,17 @@ ON CONFLICT (profile) DO UPDATE SET
 
 const backendProfilesMigrationSql = `
 INSERT INTO agentrun_backends (profile, capabilities, capacity, health, updated_at)
-VALUES ${backendCapabilitiesSqlValues()}
+VALUES ${backendCapabilitiesSqlValues(["codex", "deepseek"])}
+ON CONFLICT (profile) DO UPDATE SET
+  capabilities = EXCLUDED.capabilities,
+  capacity = EXCLUDED.capacity,
+  health = EXCLUDED.health,
+  updated_at = EXCLUDED.updated_at;
+`;
+
+const minimaxM3BackendProfileMigrationSql = `
+INSERT INTO agentrun_backends (profile, capabilities, capacity, health, updated_at)
+VALUES ${backendCapabilitiesSqlValues(["minimax-m3"])}
 ON CONFLICT (profile) DO UPDATE SET
   capabilities = EXCLUDED.capabilities,
   capacity = EXCLUDED.capacity,
@@ -239,6 +249,11 @@ const postgresMigrations: MigrationDefinition[] = [
     checksum: checksumSql(queueQ1MigrationSql),
     sql: queueQ1MigrationSql,
   },
+  {
+    id: "005_v01_minimax_m3_backend_profile",
+    checksum: checksumSql(minimaxM3BackendProfileMigrationSql),
+    sql: minimaxM3BackendProfileMigrationSql,
+  },
 ];
 
 export function postgresMigrationContract(): JsonRecord {
diff --git a/src/selftest/cases/00-redaction-postgres.ts b/src/selftest/cases/00-redaction-postgres.ts
index 6402fd0..8f2e136 100644
--- a/src/selftest/cases/00-redaction-postgres.ts
+++ b/src/selftest/cases/00-redaction-postgres.ts
@@ -13,7 +13,8 @@ const selfTest: SelfTestCase = async () => {
     (error) => error instanceof AgentRunError && error.failureKind === "infra-failed" && error.message.includes("DATABASE_URL is required"),
   );
   const postgresContract = postgresMigrationContract();
-  assert.equal(postgresContract.latestMigrationId, "004_v01_queue_q1");
+  assert.equal(postgresContract.latestMigrationId, "005_v01_minimax_m3_backend_profile");
+  assert.equal((postgresContract.checksums as Record<string, string>)["002_v01_backend_profiles"], "928b5c490cc4539cb64ecef34784557601b2724fa2870570f16a53576804e49c");
   assert.ok(Array.isArray(postgresContract.requiredTables));
   assert.ok(postgresContract.requiredTables.includes("agentrun_schema_migrations"));
   assert.ok(postgresContract.requiredTables.includes("agentrun_runs"));