graceful shutdown and rate limit implementation

package-lock.json

@@ -12,6 +12,7 @@
         "axios": "^1.10.0",
         "dotenv": "^17.4.2",
         "express": "^5.1.0",
+        "express-rate-limit": "^8.6.0",
         "helmet": "^8.1.0",
         "pino": "^10.3.1"
       },
@@ -1709,9 +1710,9 @@
       }
     },
     "node_modules/debug": {
-      "version": "4.4.1",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.1.tgz",
-      "integrity": "sha512-KcKCqiftBJcZr++7ykoDIEwSa3XWowTfNPo92BYxjXiyYEVrUQh2aLyhxBCwww+heortUFxEJYcRzosstTEBYQ==",
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
       "license": "MIT",
       "dependencies": {
         "ms": "^2.1.3"
@@ -2073,6 +2074,25 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/express-rate-limit": {
+      "version": "8.6.0",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-8.6.0.tgz",
+      "integrity": "sha512-XKJXDsASUOo0LLtFwW5hCcQGH0N4WQc/Rn8/Pvoia+TJFOkkFPvrtW9lZOeeNcxQJspvOIERMwiRLsVFlhHEkA==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.3",
+        "ip-address": "^10.2.0"
+      },
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/express-rate-limit"
+      },
+      "peerDependencies": {
+        "express": ">= 4.11"
+      }
+    },
     "node_modules/fast-copy": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/fast-copy/-/fast-copy-4.0.4.tgz",
@@ -2560,6 +2580,15 @@
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       "license": "ISC"
     },
+    "node_modules/ip-address": {
+      "version": "10.2.0",
+      "resolved": "https://registry.npmjs.org/ip-address/-/ip-address-10.2.0.tgz",
+      "integrity": "sha512-/+S6j4E9AHvW9SWMSEY9Xfy66O5PWvVEJ08O0y5JGyEKQpojb0K0GKpz/v5HJ/G0vi3D2sjGK78119oXZeE0qA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/ipaddr.js": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",