diff --git a/Fabric.Backend.Center/package-lock.json b/Fabric.Backend.Center/package-lock.json
index f6b4345..53631b6 100644
--- a/Fabric.Backend.Center/package-lock.json
+++ b/Fabric.Backend.Center/package-lock.json
@@ -25,14 +25,17 @@
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+      "license": "MIT",
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@@ -2164,6 +2300,16 @@
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@@ -2202,6 +2348,17 @@
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@@ -2311,6 +2468,22 @@
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+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
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@@ -2857,6 +3030,41 @@
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+        "hasown": "^2.0.2",
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+        "dezalgo": "^1.0.4",
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@@ -4016,6 +4224,16 @@
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@@ -4778,6 +4996,90 @@
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+      "license": "MIT",
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+        "methods": "^1.1.2",
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+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
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@@ -5587,6 +5889,13 @@
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+      "dev": true,
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diff --git a/Fabric.Backend.Center/package.json b/Fabric.Backend.Center/package.json
index b530c29..5b88138 100644
--- a/Fabric.Backend.Center/package.json
+++ b/Fabric.Backend.Center/package.json
@@ -10,7 +10,8 @@
     "lint": "eslint 'src/**/*.ts'",
     "lint:fix": "eslint 'src/**/*.ts' --fix",
     "format": "prettier --write 'src/**/*.ts'",
-    "test:unit": "vitest run"
+    "test:unit": "vitest run",
+    "test:integration": "vitest run src/*.integration.spec.ts"
   },
   "dependencies": {
     "@nestjs/common": "^10.4.8",
@@ -30,14 +31,17 @@
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     "@types/bcryptjs": "^2.4.6",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^22.10.1",
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     "eslint-config-prettier": "^10.1.8",
     "prettier": "^3.8.3",
+    "supertest": "^7.2.2",
     "ts-node": "^10.9.2",
     "typescript": "^5.7.2",
     "vitest": "^4.1.6"
diff --git a/Fabric.Backend.Center/src/entities/audit-log.entity.ts b/Fabric.Backend.Center/src/entities/audit-log.entity.ts
index 0c273d0..5b3710c 100644
--- a/Fabric.Backend.Center/src/entities/audit-log.entity.ts
+++ b/Fabric.Backend.Center/src/entities/audit-log.entity.ts
@@ -8,13 +8,13 @@ export class AuditLog {
   @Column()
   action!: string;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 64, nullable: true })
   actorId!: string | null;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 64, nullable: true })
   targetType!: string | null;
 
-  @Column({ nullable: true })
+  @Column({ type: 'varchar', length: 120, nullable: true })
   targetId!: string | null;
 
   @Column({ type: 'text', nullable: true })
diff --git a/Fabric.Backend.Center/src/health.integration.spec.ts b/Fabric.Backend.Center/src/health.integration.spec.ts
new file mode 100644
index 0000000..022a5a0
--- /dev/null
+++ b/Fabric.Backend.Center/src/health.integration.spec.ts
@@ -0,0 +1,40 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import request from 'supertest';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+
+process.env.DB_HOST = '127.0.0.1';
+process.env.DB_PORT = '3307';
+process.env.DB_USER = 'fabric';
+process.env.DB_PASSWORD = 'fabric';
+process.env.DB_NAME = 'fabric_center';
+process.env.DB_SYNC = 'false';
+process.env.CENTER_SHARED_SECRET = 'test-center-secret';
+process.env.JWT_ACCESS_SECRET = 'test-access-secret';
+process.env.JWT_REFRESH_SECRET = 'test-refresh-secret';
+
+describe('center integration (mysql + api)', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const { AppModule } = await import('./app.module');
+    const moduleRef = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleRef.createNestApplication();
+    app.setGlobalPrefix('api');
+    await app.init();
+  }, 30000);
+
+  afterAll(async () => {
+    if (app) await app.close();
+  });
+
+  it('GET /api/healthz returns db ready', async () => {
+    const res = await request(app.getHttpServer()).get('/api/healthz');
+    expect(res.status).toBe(200);
+    expect(res.body.ok).toBe(true);
+    expect(res.body.database).toBe('ready');
+  });
+});
diff --git a/Fabric.Backend.Guild/package-lock.json b/Fabric.Backend.Guild/package-lock.json
index 7f22283..0b00267 100644
--- a/Fabric.Backend.Guild/package-lock.json
+++ b/Fabric.Backend.Guild/package-lock.json
@@ -23,12 +23,15 @@
       },
       "devDependencies": {
         "@eslint/js": "^10.0.1",
+        "@nestjs/testing": "^10.4.22",
         "@types/node": "^22.10.1",
+        "@types/supertest": "^7.2.0",
         "@typescript-eslint/eslint-plugin": "^8.59.3",
         "@typescript-eslint/parser": "^8.59.3",
         "eslint": "^10.3.0",
         "eslint-config-prettier": "^10.1.8",
         "prettier": "^3.8.3",
+        "supertest": "^7.2.2",
         "ts-node": "^10.9.2",
         "typescript": "^5.7.2",
         "vitest": "^4.1.6"
@@ -557,6 +560,34 @@
         }
       }
     },
+    "node_modules/@nestjs/testing": {
+      "version": "10.4.22",
+      "resolved": "https://registry.npmjs.org/@nestjs/testing/-/testing-10.4.22.tgz",
+      "integrity": "sha512-HO9aPus3bAedAC+jKVAA8jTdaj4fs5M9fing4giHrcYV2txe9CvC1l1WAjwQ9RDhEHdugjY4y+FZA/U/YqPZrA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "2.8.1"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/nest"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^10.0.0",
+        "@nestjs/core": "^10.0.0",
+        "@nestjs/microservices": "^10.0.0",
+        "@nestjs/platform-express": "^10.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@nestjs/microservices": {
+          "optional": true
+        },
+        "@nestjs/platform-express": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@nestjs/typeorm": {
       "version": "11.0.1",
       "resolved": "https://registry.npmjs.org/@nestjs/typeorm/-/typeorm-11.0.1.tgz",
@@ -570,6 +601,19 @@
         "typeorm": "^0.3.0 || ^1.0.0-dev"
       }
     },
+    "node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
     "node_modules/@nuxtjs/opencollective": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/@nuxtjs/opencollective/-/opencollective-0.3.2.tgz",
@@ -598,6 +642,16 @@
         "url": "https://github.com/sponsors/Boshen"
       }
     },
+    "node_modules/@paralleldrive/cuid2": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/@paralleldrive/cuid2/-/cuid2-2.3.1.tgz",
+      "integrity": "sha512-XO7cAxhnTZl0Yggq6jOgjiOHhbgcO4NqFqwSmQpjK3b6TEE6Uj/jfSk6wzYyemh3+I0sHirKSetjQwn5cZktFw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "^1.1.5"
+      }
+    },
     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -982,6 +1036,13 @@
         "assertion-error": "^2.0.1"
       }
     },
+    "node_modules/@types/cookiejar": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@types/cookiejar/-/cookiejar-2.1.5.tgz",
+      "integrity": "sha512-he+DHOWReW0nghN24E1WUqM0efK4kI9oTqDm6XmK8ZPe2djZ90BSNdGnIyCLzCPw7/pogPlGbzI2wHGGmi4O/Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/deep-eql": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
@@ -1010,6 +1071,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/methods": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/@types/methods/-/methods-1.1.4.tgz",
+      "integrity": "sha512-ymXWVrDiCxTBE3+RIrrP533E70eA+9qu7zdWoHuOmGujkYtzf4HQF96b8nwHLqhuf4ykX61IGRIB38CC6/sImQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "22.19.19",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.19.tgz",
@@ -1019,6 +1087,30 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/superagent": {
+      "version": "8.1.9",
+      "resolved": "https://registry.npmjs.org/@types/superagent/-/superagent-8.1.9.tgz",
+      "integrity": "sha512-pTVjI73witn+9ILmoJdajHGW2jkSaOzhiFYF1Rd3EQ94kymLqB9PjD9ISg7WaALC7+dCHT0FGe9T2LktLq/3GQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/cookiejar": "^2.1.5",
+        "@types/methods": "^1.1.4",
+        "@types/node": "*",
+        "form-data": "^4.0.0"
+      }
+    },
+    "node_modules/@types/supertest": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@types/supertest/-/supertest-7.2.0.tgz",
+      "integrity": "sha512-uh2Lv57xvggst6lCqNdFAmDSvoMG7M/HDtX4iUCquxQ5EGPtaPM5PL5Hmi7LCvOG8db7YaCPNJEeoI8s/WzIQw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/methods": "^1.1.4",
+        "@types/superagent": "^8.1.0"
+      }
+    },
     "node_modules/@types/validator": {
       "version": "13.15.10",
       "resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.15.10.tgz",
@@ -1646,6 +1738,13 @@
       "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
       "license": "MIT"
     },
+    "node_modules/asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/assertion-error": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
@@ -1656,6 +1755,13 @@
         "node": ">=12"
       }
     },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.7.tgz",
@@ -1969,6 +2075,29 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "license": "MIT"
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/component-emitter": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.1.tgz",
+      "integrity": "sha512-T0+barUSQRTUQASh8bx02dl+DhF54GtIDY13Y3m9oWTklKbb3Wv974meRpeZ3lp1JpLVECWWNHC4vaG2XHXouQ==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/concat-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-2.0.0.tgz",
@@ -2033,6 +2162,13 @@
       "integrity": "sha512-NXdYc3dLr47pBkpUCHtKSwIOQXLVn8dZEuywboCOJY/osA0wFSLlSawr3KN8qXJEyX66FcONTH8EIlVuK0yyFA==",
       "license": "MIT"
     },
+    "node_modules/cookiejar": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.4.tgz",
+      "integrity": "sha512-LDx6oHrK+PhzLKJU9j5S7/Y3jM/mUHvD/DeI1WQmJn652iPC5Y4TBzC9l+5OMOXlyTTA+SmVUPm0HQUwpD5Jqw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/cors": {
       "version": "2.8.5",
       "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
@@ -2120,6 +2256,16 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/denque": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/denque/-/denque-2.1.0.tgz",
@@ -2158,6 +2304,17 @@
         "node": ">=8"
       }
     },
+    "node_modules/dezalgo": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/dezalgo/-/dezalgo-1.0.4.tgz",
+      "integrity": "sha512-rXSP0bf+5n0Qonsb+SVVfNfIsimO4HEtmnIpPHY8Q1UCzKlQrDMfdobr8nJOOsRgWCyMRqeSBQzmWUMq7zvVig==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "asap": "^2.0.0",
+        "wrappy": "1"
+      }
+    },
     "node_modules/diff": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.4.tgz",
@@ -2258,6 +2415,22 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-set-tostringtag": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
@@ -2804,6 +2977,41 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/form-data": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
+      "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "hasown": "^2.0.2",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/formidable": {
+      "version": "3.5.4",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.4.tgz",
+      "integrity": "sha512-YikH+7CUTOtP44ZTnUhR7Ic2UASBPOqmaRkRKxRbywPTe5VxF7RRCck4af9wutiZ/QKM5nME9Bie2fFaPz5Gug==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@paralleldrive/cuid2": "^2.2.2",
+        "dezalgo": "^1.0.4",
+        "once": "^1.4.0"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "funding": {
+        "url": "https://ko-fi.com/tunnckoCore/commissions"
+      }
+    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -3872,6 +4080,16 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "wrappy": "1"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
@@ -4635,6 +4853,90 @@
         "url": "https://github.com/sponsors/Borewit"
       }
     },
+    "node_modules/superagent": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-10.3.0.tgz",
+      "integrity": "sha512-B+4Ik7ROgVKrQsXTV0Jwp2u+PXYLSlqtDAhYnkkD+zn3yg8s/zjA2MeGayPoY/KICrbitwneDHrjSotxKL+0XQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "component-emitter": "^1.3.1",
+        "cookiejar": "^2.1.4",
+        "debug": "^4.3.7",
+        "fast-safe-stringify": "^2.1.1",
+        "form-data": "^4.0.5",
+        "formidable": "^3.5.4",
+        "methods": "^1.1.2",
+        "mime": "2.6.0",
+        "qs": "^6.14.1"
+      },
+      "engines": {
+        "node": ">=14.18.0"
+      }
+    },
+    "node_modules/superagent/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/superagent/node_modules/mime": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.6.0.tgz",
+      "integrity": "sha512-USPkMeET31rOMiarsBNIHZKLGgvKc/LrjofAnBlOttf5ajRvqiRA8QsenbcooctK6d6Ts6aqZXBA+XbkKthiQg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/superagent/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/supertest": {
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-7.2.2.tgz",
+      "integrity": "sha512-oK8WG9diS3DlhdUkcFn4tkNIiIbBx9lI2ClF8K+b2/m8Eyv47LSawxUzZQSNKUrVb2KsqeTDCcjAAVPYaSLVTA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cookie-signature": "^1.2.2",
+        "methods": "^1.1.2",
+        "superagent": "^10.3.0"
+      },
+      "engines": {
+        "node": ">=14.18.0"
+      }
+    },
+    "node_modules/supertest/node_modules/cookie-signature": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.2.2.tgz",
+      "integrity": "sha512-D76uU73ulSXrD1UXF4KE2TMxVVwhsnCgfAyTg9k8P6KGZjlXKrOLe4dJQKI3Bxi5wjesZoFXJWElNWBjPZMbhg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.6.0"
+      }
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -5444,6 +5746,13 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/Fabric.Backend.Guild/package.json b/Fabric.Backend.Guild/package.json
index 8a70e4b..831dc46 100644
--- a/Fabric.Backend.Guild/package.json
+++ b/Fabric.Backend.Guild/package.json
@@ -10,7 +10,8 @@
     "lint": "eslint 'src/**/*.ts'",
     "lint:fix": "eslint 'src/**/*.ts' --fix",
     "format": "prettier --write 'src/**/*.ts'",
-    "test:unit": "vitest run"
+    "test:unit": "vitest run",
+    "test:integration": "vitest run src/*.integration.spec.ts"
   },
   "dependencies": {
     "@nestjs/common": "^10.4.8",
@@ -28,12 +29,15 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
+    "@nestjs/testing": "^10.4.22",
     "@types/node": "^22.10.1",
+    "@types/supertest": "^7.2.0",
     "@typescript-eslint/eslint-plugin": "^8.59.3",
     "@typescript-eslint/parser": "^8.59.3",
     "eslint": "^10.3.0",
     "eslint-config-prettier": "^10.1.8",
     "prettier": "^3.8.3",
+    "supertest": "^7.2.2",
     "ts-node": "^10.9.2",
     "typescript": "^5.7.2",
     "vitest": "^4.1.6"
diff --git a/Fabric.Backend.Guild/src/health.integration.spec.ts b/Fabric.Backend.Guild/src/health.integration.spec.ts
new file mode 100644
index 0000000..5c130b6
--- /dev/null
+++ b/Fabric.Backend.Guild/src/health.integration.spec.ts
@@ -0,0 +1,43 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import request from 'supertest';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+
+process.env.DB_HOST = '127.0.0.1';
+process.env.DB_PORT = '3308';
+process.env.DB_USER = 'fabric';
+process.env.DB_PASSWORD = 'fabric';
+process.env.DB_NAME = 'fabric_guild';
+process.env.DB_SYNC = 'false';
+process.env.FABRIC_API_KEY = 'test-api-key';
+
+describe('guild integration (mysql + api)', () => {
+  let app: INestApplication;
+
+  beforeAll(async () => {
+    const { AppModule } = await import('./app.module');
+    const moduleRef = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleRef.createNestApplication();
+    app.setGlobalPrefix('api');
+    await app.init();
+  }, 30000);
+
+  afterAll(async () => {
+    if (app) await app.close();
+  });
+
+  it('GET /api/healthz returns db ready', async () => {
+    const res = await request(app.getHttpServer()).get('/api/healthz');
+    expect(res.status).toBe(200);
+    expect(res.body.ok).toBe(true);
+    expect(res.body.service).toBe('guild');
+  });
+
+  it('protects non-health endpoints by x-api-key', async () => {
+    const res = await request(app.getHttpServer()).get('/api/channels/non-exist/messages');
+    expect(res.status).toBe(401);
+  });
+});
diff --git a/docker-compose.yml b/docker-compose.yml
index 8f81707..6d81464 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -8,7 +8,6 @@ services:
       MYSQL_DATABASE: fabric_center
       MYSQL_USER: fabric
       MYSQL_PASSWORD: fabric
-    command: ["--default-authentication-plugin=mysql_native_password"]
     ports:
       - "3307:3306"
     volumes:
@@ -28,7 +27,6 @@ services:
       MYSQL_DATABASE: fabric_guild
       MYSQL_USER: fabric
       MYSQL_PASSWORD: fabric
-    command: ["--default-authentication-plugin=mysql_native_password"]
     ports:
       - "3308:3306"
     volumes:
diff --git a/docs/TODO-backend-center-guild.md b/docs/TODO-backend-center-guild.md
index bd7a47e..3e720e6 100644
--- a/docs/TODO-backend-center-guild.md
+++ b/docs/TODO-backend-center-guild.md
@@ -82,7 +82,7 @@
 
 ### 5.1 自动化测试
 - [x] 单元测试（auth/service/message/seq）
-- [ ] 集成测试（MySQL + API）
+- [x] 集成测试（MySQL + API）
 - [ ] 合约测试（Center-Guild 协议）
 
 ### 5.2 质量门禁