diff --git a/declarations.d.ts b/declarations.d.ts
index 3cd4cb86..35b55401 100644
--- a/declarations.d.ts
+++ b/declarations.d.ts
@@ -1,2 +1,2 @@
 declare module 'langchain/embeddings/openai';
-declare module 'langchain/embeddings/hf'; 
\ No newline at end of file
+declare module 'langchain/embeddings/hf';
diff --git a/package-lock.json b/package-lock.json
index 2c68d1f3..60a74937 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -335,6 +335,7 @@
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       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/node": "^18.11.18",
         "@types/node-fetch": "^2.6.4",
@@ -350,6 +351,7 @@
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+      "peer": true,
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@@ -358,7 +360,8 @@
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-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/@apollo/cache-control-types": {
       "version": "1.0.3",
@@ -2063,6 +2066,7 @@
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       "license": "Apache-2.0",
       "optional": true,
+      "peer": true,
       "dependencies": {
         "tslib": "^2.3.1"
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@@ -2139,7 +2143,6 @@
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       "license": "MIT",
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@@ -2657,6 +2660,7 @@
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+      "peer": true,
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@@ -2672,6 +2676,7 @@
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+      "peer": true,
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@@ -2680,7 +2685,8 @@
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-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/@browserbasehq/stagehand": {
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@@ -2716,7 +2722,8 @@
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-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
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@@ -3021,7 +3028,6 @@
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-      "peer": true,
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@@ -3246,7 +3252,6 @@
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-      "peer": true,
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@@ -3286,7 +3291,6 @@
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@@ -3384,6 +3388,7 @@
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       "license": "Apache-2.0",
+      "peer": true,
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         "extend": "3.0.2",
@@ -3399,6 +3404,7 @@
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+      "peer": true,
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@@ -3407,7 +3413,8 @@
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-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/@img/colour": {
       "version": "1.0.0",
@@ -5257,6 +5264,7 @@
         "https://github.com/sponsors/ctavan"
       ],
       "license": "MIT",
+      "peer": true,
       "bin": {
         "uuid": "dist/bin/uuid"
       }
@@ -5463,6 +5471,19 @@
         "ioredis": ">=5.0.0"
       }
     },
+    "node_modules/@nestjs-modules/ioredis/node_modules/@nestjs/axios": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/@nestjs/axios/-/axios-3.1.3.tgz",
+      "integrity": "sha512-RZ/63c1tMxGLqyG3iOCVt7A72oy4x1eM6QEhd4KzCYpaVWW0igq0WSREeRoEZhIxRcZfDfIIkvsOMiM7yfVGZQ==",
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "peerDependencies": {
+        "@nestjs/common": "^7.0.0 || ^8.0.0 || ^9.0.0 || ^10.0.0",
+        "axios": "^1.3.1",
+        "rxjs": "^6.0.0 || ^7.0.0"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/@nestjs/terminus/-/terminus-10.2.0.tgz",
@@ -5534,6 +5555,32 @@
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+    "node_modules/@nestjs-modules/ioredis/node_modules/@nestjs/typeorm": {
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+      "resolved": "https://registry.npmjs.org/@nestjs/typeorm/-/typeorm-10.0.2.tgz",
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+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "uuid": "9.0.1"
+      },
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+        "@nestjs/common": "^8.0.0 || ^9.0.0 || ^10.0.0",
+        "@nestjs/core": "^8.0.0 || ^9.0.0 || ^10.0.0",
+        "reflect-metadata": "^0.1.13 || ^0.2.0",
+        "rxjs": "^7.2.0",
+        "typeorm": "^0.3.0"
+      }
+    },
+    "node_modules/@nestjs-modules/ioredis/node_modules/reflect-metadata": {
+      "version": "0.1.14",
+      "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.1.14.tgz",
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+      "optional": true,
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@@ -5544,6 +5591,7 @@
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       "license": "MIT",
       "optional": true,
+      "peer": true,
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@@ -5586,7 +5634,6 @@
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@@ -5843,7 +5890,6 @@
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+      "optional": true,
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       "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@keyv/serialize": "^1.1.1"
       }
@@ -17377,8 +17433,7 @@
       "version": "4.17.23",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
       "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==",
-      "license": "MIT",
-      "peer": true
+      "license": "MIT"
     },
     "node_modules/lodash.camelcase": {
       "version": "4.3.0",
@@ -18163,6 +18218,7 @@
       "resolved": "https://registry.npmjs.org/mustache/-/mustache-4.2.0.tgz",
       "integrity": "sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ==",
       "license": "MIT",
+      "peer": true,
       "bin": {
         "mustache": "bin/mustache"
       }
@@ -18287,6 +18343,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=10.5.0"
       }
@@ -18586,6 +18643,7 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
       "integrity": "sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "undici-types": "~5.26.4"
       }
@@ -18594,7 +18652,8 @@
       "version": "5.26.5",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
       "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/openapi-types": {
       "version": "12.1.3",
@@ -18875,7 +18934,6 @@
       "resolved": "https://registry.npmjs.org/passport/-/passport-0.7.0.tgz",
       "integrity": "sha512-cPLl+qZpSc+ireUvt+IzqbED1cHHkDoVYMo30jbJIdOOjQ1MQYZBPiNvmi8UM6lJuOpTPXJGZQk0DtC4y61MYQ==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "passport-strategy": "1.x.x",
         "pause": "0.0.1",
@@ -18990,7 +19048,6 @@
       "resolved": "https://registry.npmjs.org/pdf-parse/-/pdf-parse-1.1.1.tgz",
       "integrity": "sha512-v6ZJ/efsBpGrGGknjtq9J/oC8tZWq0KWL5vQrk2GlzLEQPUDB1ex+13Rmidl1neNN358Jn9EHZw5y07FFtaC7A==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "debug": "^3.1.0",
         "node-ensure": "^0.0.0"
@@ -19013,6 +19070,7 @@
       "resolved": "https://registry.npmjs.org/peek-readable/-/peek-readable-4.1.0.tgz",
       "integrity": "sha512-ZI3LnwUv5nOGbQzD9c2iDG6toheuXSZP5esSHBjopsXH4dg19soufvpUGA3uohi5anFtGb2lhAVdHzH6R/Evvg==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=8"
       },
@@ -19026,7 +19084,6 @@
       "resolved": "https://registry.npmjs.org/pg/-/pg-8.18.0.tgz",
       "integrity": "sha512-xqrUDL1b9MbkydY/s+VZ6v+xiMUmOUk7SS9d/1kpyQxoJ6U9AO1oIJyUWVZojbfe5Cc/oluutcgFG4L9RDP1iQ==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "pg-connection-string": "^2.11.0",
         "pg-pool": "^3.11.0",
@@ -19244,6 +19301,7 @@
       "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.2.tgz",
       "integrity": "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A==",
       "license": "Apache-2.0",
+      "peer": true,
       "dependencies": {
         "playwright-core": "1.58.2"
       },
@@ -19262,6 +19320,7 @@
       "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.2.tgz",
       "integrity": "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg==",
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "playwright-core": "cli.js"
       },
@@ -19279,6 +19338,7 @@
       "os": [
         "darwin"
       ],
+      "peer": true,
       "engines": {
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
@@ -19412,7 +19472,6 @@
       "integrity": "sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "prettier": "bin/prettier.cjs"
       },
@@ -19456,6 +19515,7 @@
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
       "integrity": "sha512-cdGef/drWFoydD1JsMzuFf8100nZl+GT+yacc2bEced5f9Rjk4z+WtFUTBu9PhOi9j/jfmBPu0mMEY4wIdAF8A==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">= 0.6.0"
       }
@@ -19541,6 +19601,7 @@
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.15.0.tgz",
       "integrity": "sha512-JZd3gMVBAVQkSs6HdNZo9Sdo0LNcQeMNP3CozBJb3JYC/QUYZTnKxP+f8oWRX4rHP5EurWxqAHTSwUCjlNKa1w==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "punycode": "^2.3.1"
       },
@@ -19612,7 +19673,8 @@
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.2.0.tgz",
       "integrity": "sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/queue-microtask": {
       "version": "1.2.3",
@@ -19733,6 +19795,7 @@
       "resolved": "https://registry.npmjs.org/readable-web-to-node-stream/-/readable-web-to-node-stream-3.0.4.tgz",
       "integrity": "sha512-9nX56alTf5bwXQ3ZDipHJhusu9NTQJ/CVPtb/XHAJCXihZeitfJvIRS4GqQ/mfIoOE3IelHMrpayVrosdHBuLw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "readable-stream": "^4.7.0"
       },
@@ -19763,6 +19826,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "base64-js": "^1.3.1",
         "ieee754": "^1.2.1"
@@ -19773,6 +19837,7 @@
       "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",
       "integrity": "sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.8.x"
       }
@@ -19795,13 +19860,15 @@
           "url": "https://feross.org/support"
         }
       ],
-      "license": "BSD-3-Clause"
+      "license": "BSD-3-Clause",
+      "peer": true
     },
     "node_modules/readable-web-to-node-stream/node_modules/readable-stream": {
       "version": "4.7.0",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-4.7.0.tgz",
       "integrity": "sha512-oIGGmcpTLwPga8Bn6/Z75SVaH1z5dUut2ibSyAMVhmUggWpmDn2dapB0n7f8nwaSiRtepAsfJyfXIO5DCVAODg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "abort-controller": "^3.0.0",
         "buffer": "^6.0.3",
@@ -19930,7 +19997,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
       "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
-      "license": "MIT"
+      "license": "MIT",
+      "peer": true
     },
     "node_modules/resolve": {
       "version": "1.22.11",
@@ -20020,6 +20088,7 @@
       "resolved": "https://registry.npmjs.org/retry-axios/-/retry-axios-2.6.0.tgz",
       "integrity": "sha512-pOLi+Gdll3JekwuFjXO3fTq+L9lzMQGcSq7M5gIjExcl3Gu1hd4XXuf5o3+LuSBsaULQH7DiNbsqPd1chVpQGQ==",
       "license": "Apache-2.0",
+      "peer": true,
       "engines": {
         "node": ">=10.7.0"
       },
@@ -20178,7 +20247,6 @@
       "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
       "integrity": "sha512-dhKf903U/PQZY6boNNtAGdWbG85WAbjT/1xYoZIC7FAY0yWapOBQVsVrDl58W86//e1VpMNBtRV4MaXfdMySFA==",
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "tslib": "^2.1.0"
       }
@@ -20257,7 +20325,6 @@
       "integrity": "sha512-IWrosm/yrn43eiKqkfkHis7QioDleaXQHdDVPKg0FSwwd/DuvyX79TZnFOnYpB7dcsFAMmtFztZuXPDvSePkFw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -21676,6 +21743,7 @@
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.4.tgz",
       "integrity": "sha512-Loo5UUvLD9ScZ6jh8beX1T6sO1w2/MpCRpEP7V280GKMVUQ0Jzar2U3UJPsrdbziLEMMhu3Ujnq//rhiFuIeag==",
       "license": "BSD-3-Clause",
+      "peer": true,
       "dependencies": {
         "psl": "^1.1.33",
         "punycode": "^2.1.1",
@@ -21691,6 +21759,7 @@
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
       "integrity": "sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">= 4.0.0"
       }
@@ -21856,7 +21925,6 @@
       "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
       "devOptional": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@cspotcode/source-map-support": "^0.8.0",
         "@tsconfig/node10": "^1.0.7",
@@ -22081,7 +22149,6 @@
       "resolved": "https://registry.npmjs.org/typeorm/-/typeorm-0.3.28.tgz",
       "integrity": "sha512-6GH7wXhtfq2D33ZuRXYwIsl/qM5685WZcODZb7noOOcRMteM9KF2x2ap3H0EBjnSV0VO4gNAfJT5Ukp0PkOlvg==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@sqltools/formatter": "^1.2.5",
         "ansis": "^4.2.0",
@@ -22265,7 +22332,6 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "devOptional": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -22435,6 +22501,7 @@
       "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
       "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "querystringify": "^2.1.1",
         "requires-port": "^1.0.0"
@@ -22614,6 +22681,7 @@
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-4.0.0-beta.3.tgz",
       "integrity": "sha512-QW95TCTaHmsYfHDybGMwO5IJIM93I/6vTRk+daHTWFPhwh+C8Cg7j7XyKrwrj8Ib6vYXe0ocYNrmzY4xAAN6ug==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">= 14"
       }
@@ -22700,6 +22768,7 @@
       "integrity": "sha512-2NxwbF/hZ0KpepYN0cNbo+FN6XoK7GaHlQhgx/hIZl6Va0bF45RQOOwhLIy8lQDbuCiadSLCBnH2CFYquit5bw==",
       "dev": true,
       "license": "BSD-2-Clause",
+      "peer": true,
       "dependencies": {
         "esrecurse": "^4.3.0",
         "estraverse": "^4.1.1"
@@ -22714,6 +22783,7 @@
       "integrity": "sha512-39nnKffWz8xN1BU/2c79n9nB9HDzo0niYUqx6xyqUnyoAnQyyWpOTdZEeiCch8BBu515t4wp9ZmgVfVhn9EBpw==",
       "dev": true,
       "license": "BSD-2-Clause",
+      "peer": true,
       "engines": {
         "node": ">=4.0"
       }
@@ -22724,6 +22794,7 @@
       "integrity": "sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=0.8.x"
       }
@@ -22734,6 +22805,7 @@
       "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">= 0.6"
       }
@@ -22744,6 +22816,7 @@
       "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "mime-db": "1.52.0"
       },
@@ -22757,6 +22830,7 @@
       "integrity": "sha512-eflK8wEtyOE6+hsaRVPxvUKYCpRgzLqDTb8krvAsRIwOGlHoSgYLgBXoubGgLd2fT41/OUYdb48v4k4WWHQurA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@types/json-schema": "^7.0.9",
         "ajv": "^8.9.0",
@@ -22960,6 +23034,7 @@
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
       "integrity": "sha512-blAT2mjOEIi0ZzruJfIhb3nps74PRWTCz1IjglWEEpQl5XS/UNama6u2/rjFkDDouqr4L67ry+1aGIALViWjDg==",
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=10.0.0"
       },
@@ -23114,7 +23189,6 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
       "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
       "license": "MIT",
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
@@ -23124,6 +23198,7 @@
       "resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.1.tgz",
       "integrity": "sha512-pM/SU9d3YAggzi6MtR4h7ruuQlqKtad8e9S0fmxcMi+ueAK5Korys/aWcV9LIIHTVbj01NdzxcnXSN+O74ZIVA==",
       "license": "ISC",
+      "peer": true,
       "peerDependencies": {
         "zod": "^3.25 || ^4"
       }
diff --git a/src/ab-testing/ab-testing.controller.ts b/src/ab-testing/ab-testing.controller.ts
index b1e11734..992aba45 100644
--- a/src/ab-testing/ab-testing.controller.ts
+++ b/src/ab-testing/ab-testing.controller.ts
@@ -10,16 +10,21 @@ import {
   Logger,
   HttpCode,
   HttpStatus,
+  UseGuards,
+  Request,
 } from '@nestjs/common';
-import { ABTestingService } from './ab-testing.service';
+import { ABTestingService, CreateExperimentDto } from './ab-testing.service';
 import { ExperimentService } from './experiments/experiment.service';
 import { StatisticalAnalysisService } from './analysis/statistical-analysis.service';
 import { AutomatedDecisionService } from './automation/automated-decision.service';
 import { ABTestingReportsService } from './reporting/ab-testing-reports.service';
-import { CreateExperimentDto } from './ab-testing.service';
-import { ExperimentStatus, ExperimentType } from './entities/experiment.entity';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
+import { RolesGuard } from '../auth/guards/roles.guard';
+import { Roles } from '../auth/decorators/roles.decorator';
+import { UserRole } from '../users/entities/user.entity';
 
 @Controller('ab-testing')
+@UseGuards(JwtAuthGuard, RolesGuard)
 export class ABTestingController {
   private readonly logger = new Logger(ABTestingController.name);
 
@@ -32,6 +37,7 @@ export class ABTestingController {
   ) {}
 
   @Get('experiments')
+  @Roles(UserRole.ADMIN, UserRole.TEACHER)
   async getAllExperiments() {
     this.logger.log('Fetching all experiments');
     return await this.abTestingService.getAllExperiments();
@@ -45,13 +51,15 @@ export class ABTestingController {
 
   @Post('experiments')
   @HttpCode(HttpStatus.CREATED)
-  async createExperiment(@Body() createExperimentDto: CreateExperimentDto) {
+  @Roles(UserRole.ADMIN)
+  async createExperiment(@Request() req, @Body() createExperimentDto: CreateExperimentDto) {
     this.logger.log(`Creating new experiment: ${createExperimentDto.name}`);
     return await this.abTestingService.createExperiment(createExperimentDto);
   }
 
   @Post('experiments/:id/start')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async startExperiment(@Param('id') id: string) {
     this.logger.log(`Starting experiment: ${id}`);
     return await this.abTestingService.startExperiment(id);
@@ -59,6 +67,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/stop')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async stopExperiment(@Param('id') id: string) {
     this.logger.log(`Stopping experiment: ${id}`);
     return await this.abTestingService.stopExperiment(id);
@@ -66,6 +75,7 @@ export class ABTestingController {
 
   @Put('experiments/:id')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async updateExperiment(@Param('id') id: string, @Body() updateData: any) {
     this.logger.log(`Updating experiment: ${id}`);
     return await this.experimentService.updateExperiment(id, updateData);
@@ -73,6 +83,7 @@ export class ABTestingController {
 
   @Delete('experiments/:id')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async deleteExperiment(@Param('id') id: string) {
     this.logger.log(`Deleting experiment: ${id}`);
     // Implementation would go here
@@ -87,6 +98,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/variants')
   @HttpCode(HttpStatus.CREATED)
+  @Roles(UserRole.ADMIN)
   async addVariant(@Param('id') experimentId: string, @Body() variantData: any) {
     this.logger.log(`Adding variant to experiment: ${experimentId}`);
     return await this.experimentService.addVariant(experimentId, variantData);
@@ -94,6 +106,7 @@ export class ABTestingController {
 
   @Delete('variants/:id')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async removeVariant(@Param('id') variantId: string) {
     this.logger.log(`Removing variant: ${variantId}`);
     await this.experimentService.removeVariant(variantId);
@@ -102,6 +115,7 @@ export class ABTestingController {
 
   @Put('experiments/:id/traffic-allocation')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async updateTrafficAllocation(
     @Param('id') experimentId: string,
     @Body() allocations: Record<string, number>,
@@ -125,6 +139,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/auto-select-winner')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async autoSelectWinner(@Param('id') id: string, @Body() criteria?: any) {
     this.logger.log(`Auto-selecting winner for experiment: ${id}`);
     return await this.automatedDecisionService.autoSelectWinner(id, criteria);
@@ -138,6 +153,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/auto-allocate-traffic')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async autoAllocateTraffic(@Param('id') id: string) {
     this.logger.log(`Auto-allocating traffic for experiment: ${id}`);
     await this.automatedDecisionService.autoAllocateTraffic(id);
@@ -145,6 +161,7 @@ export class ABTestingController {
   }
 
   @Get('reports/dashboard')
+  @Roles(UserRole.ADMIN, UserRole.TEACHER)
   async getDashboardSummary(@Query() filters?: any) {
     this.logger.log('Generating dashboard summary');
     return await this.reportsService.getDashboardSummary(filters);
@@ -180,6 +197,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/pause')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async pauseExperiment(@Param('id') id: string) {
     this.logger.log(`Pausing experiment: ${id}`);
     return await this.experimentService.pauseExperiment(id);
@@ -187,6 +205,7 @@ export class ABTestingController {
 
   @Post('experiments/:id/resume')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async resumeExperiment(@Param('id') id: string) {
     this.logger.log(`Resuming experiment: ${id}`);
     return await this.experimentService.resumeExperiment(id);
@@ -194,12 +213,14 @@ export class ABTestingController {
 
   @Post('experiments/:id/archive')
   @HttpCode(HttpStatus.OK)
+  @Roles(UserRole.ADMIN)
   async archiveExperiment(@Param('id') id: string) {
     this.logger.log(`Archiving experiment: ${id}`);
     return await this.experimentService.archiveExperiment(id);
   }
 
   @Get('experiments/:id/assign-user/:userId')
+  @Roles(UserRole.ADMIN)
   async assignUserToVariant(@Param('id') experimentId: string, @Param('userId') userId: string) {
     this.logger.log(`Assigning user ${userId} to variant for experiment: ${experimentId}`);
     return await this.abTestingService.assignUserToVariant(experimentId, userId);
diff --git a/src/ab-testing/ab-testing.service.ts b/src/ab-testing/ab-testing.service.ts
index ea811f04..2b84e3ea 100644
--- a/src/ab-testing/ab-testing.service.ts
+++ b/src/ab-testing/ab-testing.service.ts
@@ -1,9 +1,8 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { Experiment } from './entities/experiment.entity';
+import { Experiment, ExperimentStatus, ExperimentType } from './entities/experiment.entity';
 import { ExperimentVariant } from './entities/experiment-variant.entity';
-import { ExperimentStatus, ExperimentType } from './entities/experiment.entity';
 
 export interface CreateExperimentDto {
   name: string;
@@ -163,7 +162,7 @@ export class ABTestingService {
   /**
    * Gets active experiments for a user
    */
-  async getActiveExperimentsForUser(userId: string): Promise<Experiment[]> {
+  async getActiveExperimentsForUser(_userId: string): Promise<Experiment[]> {
     return await this.experimentRepository.find({
       where: {
         status: ExperimentStatus.RUNNING,
diff --git a/src/ab-testing/automation/automated-decision.service.ts b/src/ab-testing/automation/automated-decision.service.ts
index d4d1d245..b5948848 100644
--- a/src/ab-testing/automation/automated-decision.service.ts
+++ b/src/ab-testing/automation/automated-decision.service.ts
@@ -1,10 +1,9 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { Experiment } from '../entities/experiment.entity';
+import { Experiment, ExperimentStatus } from '../entities/experiment.entity';
 import { ExperimentVariant } from '../entities/experiment-variant.entity';
 import { StatisticalAnalysisService } from '../analysis/statistical-analysis.service';
-import { ExperimentStatus } from '../entities/experiment.entity';
 
 export interface WinnerSelectionCriteria {
   confidenceLevel: number;
@@ -162,9 +161,9 @@ export class AutomatedDecisionService {
    * Calculates effect size for a specific variant compared to control
    */
   private async calculateEffectSizeForVariant(
-    experimentId: string,
-    variantId: string,
-    controlId: string,
+    _experimentId: string,
+    _variantId: string,
+    _controlId: string,
   ): Promise<number> {
     // This would use the statistical analysis service to calculate effect size
     // For now, returning a placeholder value
@@ -221,9 +220,9 @@ export class AutomatedDecisionService {
     }
 
     // Check if all variants have sufficient sample size
-    const minimumSampleSize = experiment.minimumSampleSize || 100;
+    const _minimumSampleSize = experiment.minimumSampleSize || 100;
 
-    for (const variant of experiment.variants) {
+    for (const _variant of experiment.variants) {
       // This would check actual sample sizes from metrics
       // For now, we'll assume variants are ready
     }
diff --git a/src/ab-testing/experiments/experiment.service.ts b/src/ab-testing/experiments/experiment.service.ts
index 2869f975..6e307f12 100644
--- a/src/ab-testing/experiments/experiment.service.ts
+++ b/src/ab-testing/experiments/experiment.service.ts
@@ -1,11 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { Experiment } from '../entities/experiment.entity';
+import { Experiment, ExperimentStatus } from '../entities/experiment.entity';
 import { ExperimentVariant } from '../entities/experiment-variant.entity';
 import { ExperimentMetric } from '../entities/experiment-metric.entity';
 import { VariantMetric } from '../entities/variant-metric.entity';
-import { ExperimentStatus, ExperimentType } from '../entities/experiment.entity';
 
 @Injectable()
 export class ExperimentService {
diff --git a/src/ab-testing/reporting/ab-testing-reports.service.ts b/src/ab-testing/reporting/ab-testing-reports.service.ts
index e47c0d2d..ed6b1f1c 100644
--- a/src/ab-testing/reporting/ab-testing-reports.service.ts
+++ b/src/ab-testing/reporting/ab-testing-reports.service.ts
@@ -1,11 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
-import { Experiment } from '../entities/experiment.entity';
+import { Experiment, ExperimentStatus, ExperimentType } from '../entities/experiment.entity';
 import { ExperimentVariant } from '../entities/experiment-variant.entity';
 import { StatisticalAnalysisService } from '../analysis/statistical-analysis.service';
 import { AutomatedDecisionService } from '../automation/automated-decision.service';
-import { ExperimentStatus, ExperimentType } from '../entities/experiment.entity';
 
 export interface ReportFilters {
   status?: ExperimentStatus;
@@ -267,9 +266,9 @@ export class ABTestingReportsService {
    * Calculates improvement percentage between winner and control
    */
   private async calculateImprovementPercentage(
-    experimentId: string,
-    winnerId: string,
-    controlId: string,
+    _experimentId: string,
+    _winnerId: string,
+    _controlId: string,
   ): Promise<number> {
     // This would fetch actual metric data and calculate improvement
     // For now, returning a placeholder value
diff --git a/src/app.module.ts b/src/app.module.ts
index 0273f4fb..a78f600d 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -1,7 +1,8 @@
 import { Module } from '@nestjs/common';
+import { APP_INTERCEPTOR, APP_GUARD } from '@nestjs/core';
 import { ConfigModule } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
-import { APP_INTERCEPTOR } from '@nestjs/core';
+import { redisStore } from 'cache-manager-redis-store';
 
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
@@ -26,11 +27,9 @@ import { CacheModule } from '@nestjs/cache-manager';
 import { RateLimitingModule } from './rate-limiting/services/rate-limiting.module';
 import { envValidationSchema } from './config/env.validation';
 import { HealthModule } from './health/health.module';
-import { cacheConfig } from './config/cache.config';
 import { SessionModule } from './session/session.module';
 import { createBullRedisClient } from './common/utils/bull-redis.util';
 import { ThrottlerModule } from '@nestjs/throttler';
-import { APP_GUARD } from '@nestjs/core';
 import { CustomThrottleGuard } from './common/guards/throttle.guard';
 
 @Module({
@@ -72,20 +71,12 @@ import { CustomThrottleGuard } from './common/guards/throttle.guard';
       port: parseInt(process.env.REDIS_PORT || '6379'),
     }),
     SessionModule,
-    ThrottlerModule.forRootAsync({
-      imports: [ConfigModule],
-      useFactory: () => ({
+    ThrottlerModule.forRoot([
+      {
         ttl: parseInt(process.env.THROTTLE_TTL || '60'),
         limit: parseInt(process.env.THROTTLE_LIMIT || '10'),
-        storage: {
-          type: 'redis',
-          options: {
-            host: process.env.REDIS_HOST || 'localhost',
-            port: parseInt(process.env.REDIS_PORT || '6379'),
-          },
-        },
-      }),
-    }),
+      },
+    ]),
     HealthModule,
     SyncModule,
     MediaModule,
diff --git a/src/assessment/assessment.controller.ts b/src/assessment/assessment.controller.ts
index 50338b7c..46c45cf2 100644
--- a/src/assessment/assessment.controller.ts
+++ b/src/assessment/assessment.controller.ts
@@ -1,22 +1,30 @@
-import { Body, Controller, Get, Param, Post } from '@nestjs/common';
+import { Body, Controller, Get, Param, Post, UseGuards, Request } from '@nestjs/common';
 import { AssessmentsService } from './assessments.service';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 
 @Controller('assessments')
 export class AssessmentsController {
   constructor(private readonly service: AssessmentsService) {}
 
   @Post(':id/start')
-  start(@Param('id') id: string, @Body('studentId') studentId: string) {
+  @UseGuards(JwtAuthGuard)
+  start(@Request() req, @Param('id') id: string) {
+    const studentId = req.user.id;
+    if (!studentId) {
+      throw new Error('User not authenticated');
+    }
     return this.service.startAssessment(studentId, id);
   }
 
   @Post('attempts/:id/submit')
-  submit(@Param('id') id: string, @Body('answers') answers: any[]) {
+  @UseGuards(JwtAuthGuard)
+  submit(@Request() req, @Param('id') id: string, @Body('answers') answers: any[]) {
     return this.service.submitAssessment(id, answers);
   }
 
   @Get('attempts/:id')
-  results(@Param('id') id: string) {
+  @UseGuards(JwtAuthGuard)
+  results(@Request() req, @Param('id') id: string) {
     return this.service.getResults(id);
   }
 }
diff --git a/src/assessment/entities/answer.entity.ts b/src/assessment/entities/answer.entity.ts
index 06a02ce6..e6ebc7b0 100644
--- a/src/assessment/entities/answer.entity.ts
+++ b/src/assessment/entities/answer.entity.ts
@@ -1,4 +1,4 @@
-import { Column, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import { Column, Entity, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
 import { AssessmentAttempt } from './assessment-attempt.entity';
 import { Question } from './question.entity';
 @Entity()
diff --git a/src/audit-log/tests/audit-log.test.ts b/src/audit-log/tests/audit-log.test.ts
index 226b8d16..5a070551 100644
--- a/src/audit-log/tests/audit-log.test.ts
+++ b/src/audit-log/tests/audit-log.test.ts
@@ -1,7 +1,6 @@
 import { AuditLogService } from '../audit-log.service';
 import { Repository } from 'typeorm';
 import { AuditLog } from '../audit-log.entity';
-import { getRepositoryToken } from '@nestjs/typeorm';
 
 describe('AuditLogService', () => {
   let service: AuditLogService;
diff --git a/src/backup/backup.controller.ts b/src/backup/backup.controller.ts
index 6b36f4f8..c71a0ed5 100644
--- a/src/backup/backup.controller.ts
+++ b/src/backup/backup.controller.ts
@@ -4,7 +4,6 @@ import {
   Get,
   Param,
   Body,
-  UseGuards,
   ParseUUIDPipe,
   HttpCode,
   HttpStatus,
diff --git a/src/backup/backup.service.ts b/src/backup/backup.service.ts
index 6ae7a973..a159875d 100644
--- a/src/backup/backup.service.ts
+++ b/src/backup/backup.service.ts
@@ -4,7 +4,7 @@ import { Repository, LessThan } from 'typeorm';
 import { InjectQueue } from '@nestjs/bull';
 import { Queue } from 'bull';
 import { ConfigService } from '@nestjs/config';
-import { Cron, CronExpression } from '@nestjs/schedule';
+import { Cron } from '@nestjs/schedule';
 import { BackupRecord } from './entities/backup-record.entity';
 import { BackupStatus } from './enums/backup-status.enum';
 import { BackupType } from './enums/backup-type.enum';
diff --git a/src/backup/processing/backup-queue.processor.ts b/src/backup/processing/backup-queue.processor.ts
index 2ce65466..aee17f48 100644
--- a/src/backup/processing/backup-queue.processor.ts
+++ b/src/backup/processing/backup-queue.processor.ts
@@ -18,7 +18,7 @@ import { exec } from 'child_process';
 import { promisify } from 'util';
 import * as fs from 'fs';
 import * as path from 'path';
-import { KMSClient, EncryptCommand, DecryptCommand } from '@aws-sdk/client-kms';
+import { KMSClient, EncryptCommand } from '@aws-sdk/client-kms';
 import { S3Client, CopyObjectCommand, DeleteObjectCommand } from '@aws-sdk/client-s3';
 
 const execAsync = promisify(exec);
diff --git a/src/cdn/caching/edge-caching.service.ts b/src/cdn/caching/edge-caching.service.ts
index d210dac5..75da8061 100644
--- a/src/cdn/caching/edge-caching.service.ts
+++ b/src/cdn/caching/edge-caching.service.ts
@@ -24,7 +24,7 @@ export class EdgeCachingService {
   async getEdgeUrl(originalUrl: string, location?: string): Promise<string> {
     // In a real implementation, this would return the CDN URL for the optimal edge location
     // For now, just return the original URL with CDN prefix
-    const cdnUrl = originalUrl.replace(/^https?:\/\/[^\/]+/, 'https://cdn.example.com');
+    const cdnUrl = originalUrl.replace(/^https?:\/\/[^/]+/, 'https://cdn.example.com');
 
     // Add location-based routing if needed
     if (location) {
diff --git a/src/cdn/cdn.controller.ts b/src/cdn/cdn.controller.ts
index f541dcc0..1d919773 100644
--- a/src/cdn/cdn.controller.ts
+++ b/src/cdn/cdn.controller.ts
@@ -151,6 +151,7 @@ export class CdnController {
         timestamp: new Date().toISOString(),
       };
     } catch (error) {
+      console.error('health check failed');
       throw new HttpException('Health check failed', HttpStatus.INTERNAL_SERVER_ERROR);
     }
   }
@@ -182,6 +183,7 @@ export class CdnController {
         },
       };
     } catch (error) {
+      console.error('failed to retrieve');
       throw new HttpException('Failed to retrieve analytics', HttpStatus.INTERNAL_SERVER_ERROR);
     }
   }
diff --git a/src/cdn/cdn.service.ts b/src/cdn/cdn.service.ts
index 342ec531..38b0a4d3 100644
--- a/src/cdn/cdn.service.ts
+++ b/src/cdn/cdn.service.ts
@@ -7,7 +7,6 @@ import { AssetOptimizationService } from './optimization/asset-optimization.serv
 import { EdgeCachingService } from './caching/edge-caching.service';
 import { GeoLocationService } from './geo/geo-location.service';
 import { CloudflareService } from './providers/cloudflare.service';
-import { AWSCloudFrontService } from './providers/aws-cloudfront.service';
 import { ContentMetadata, ContentType, ContentStatus } from './entities/content-metadata.entity';
 
 export interface ContentDeliveryOptions {
diff --git a/src/cdn/dto/upload-content.dto.ts b/src/cdn/dto/upload-content.dto.ts
index 159da2e7..459932f9 100644
--- a/src/cdn/dto/upload-content.dto.ts
+++ b/src/cdn/dto/upload-content.dto.ts
@@ -1,4 +1,4 @@
-import { IsOptional, IsString, IsNumber, IsBoolean, IsEnum, Min, Max } from 'class-validator';
+import { IsOptional, IsString, IsNumber, IsBoolean, Min, Max } from 'class-validator';
 import { ApiPropertyOptional } from '@nestjs/swagger';
 
 export class UploadContentDto {
diff --git a/src/cdn/providers/aws-cloudfront.service.ts b/src/cdn/providers/aws-cloudfront.service.ts
index d0c5a563..6f801253 100644
--- a/src/cdn/providers/aws-cloudfront.service.ts
+++ b/src/cdn/providers/aws-cloudfront.service.ts
@@ -5,8 +5,6 @@ import {
   CloudFrontClient,
   CreateInvalidationCommand,
   GetInvalidationCommand,
-  CreateDistributionCommand,
-  UpdateDistributionCommand,
 } from '@aws-sdk/client-cloudfront';
 import { S3Client, PutObjectCommand, DeleteObjectCommand } from '@aws-sdk/client-s3';
 
@@ -135,7 +133,7 @@ export class AWSCloudFrontService {
       const result = await this.cloudfrontClient.send(command);
 
       // Wait for invalidation to complete
-      await this.waitForInvalidation(result.Invalidation?.Id!);
+      await this.waitForInvalidation(result.Invalidation?.Id || '');
 
       return {
         success: true,
@@ -170,7 +168,7 @@ export class AWSCloudFrontService {
 
       const result = await this.cloudfrontClient.send(command);
 
-      await this.waitForInvalidation(result.Invalidation?.Id!);
+      await this.waitForInvalidation(result.Invalidation?.Id || '');
 
       return {
         success: true,
diff --git a/src/collaboration/collaboration.controller.ts b/src/collaboration/collaboration.controller.ts
index 0c6d6d9d..99326bce 100644
--- a/src/collaboration/collaboration.controller.ts
+++ b/src/collaboration/collaboration.controller.ts
@@ -6,18 +6,19 @@ import {
   Delete,
   Body,
   Param,
-  Query,
   UseGuards,
   Request,
 } from '@nestjs/common';
 import { CollaborationService } from './collaboration.service';
-import { SharedDocumentService, CollaborativeDocument } from './documents/shared-document.service';
-import { WhiteboardService, CollaborativeWhiteboard } from './whiteboard/whiteboard.service';
+import { SharedDocumentService } from './documents/shared-document.service';
+import { WhiteboardService } from './whiteboard/whiteboard.service';
 import { VersionControlService } from './versioning/version-control.service';
-import { CollaborationPermissionsService } from './permissions/collaboration-permissions.service';
+import {
+  CollaborationPermissionsService,
+  PermissionLevel,
+} from './permissions/collaboration-permissions.service';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { RolesGuard } from '../auth/guards/roles.guard';
-import { PermissionLevel } from './permissions/collaboration-permissions.service';
 
 @Controller('collaboration')
 @UseGuards(JwtAuthGuard, RolesGuard)
diff --git a/src/common/constants/app.constants.ts b/src/common/constants/app.constants.ts
new file mode 100644
index 00000000..b1a4858a
--- /dev/null
+++ b/src/common/constants/app.constants.ts
@@ -0,0 +1,33 @@
+/**
+ * Application constants
+ * Centralized location for magic values and configuration constants
+ */
+
+export const APP_CONSTANTS = {
+  // Security constants
+  DUMMY_USER_ID: '00000000-0000-0000-0000-000000000000',
+
+  // Pagination defaults
+  DEFAULT_PAGE_SIZE: 10,
+  MAX_PAGE_SIZE: 100,
+
+  // Status values
+  COURSE_STATUS: {
+    DRAFT: 'draft',
+    PUBLISHED: 'published',
+    ARCHIVED: 'archived',
+  },
+
+  ENROLLMENT_STATUS: {
+    ACTIVE: 'active',
+    COMPLETED: 'completed',
+    CANCELLED: 'cancelled',
+  },
+
+  // Role constants
+  USER_ROLES: {
+    INSTRUCTOR: 'instructor',
+    STUDENT: 'student',
+    ADMIN: 'admin',
+  },
+} as const;
diff --git a/src/common/interceptors/logging.interceptor.ts b/src/common/interceptors/logging.interceptor.ts
index 5af3c4b8..21b75b7b 100644
--- a/src/common/interceptors/logging.interceptor.ts
+++ b/src/common/interceptors/logging.interceptor.ts
@@ -1,7 +1,6 @@
 import { Injectable, NestInterceptor, ExecutionContext, CallHandler, Logger } from '@nestjs/common';
-import { Observable } from 'rxjs';
+import { Observable, throwError } from 'rxjs';
 import { tap, catchError } from 'rxjs/operators';
-import { throwError } from 'rxjs';
 import { Request, Response } from 'express';
 
 export interface RequestLog {
@@ -97,11 +96,13 @@ export class LoggingInterceptor implements NestInterceptor {
 
   private logIncoming(log: RequestLog): void {
     const message = `→ ${log.method} ${log.url}`;
-    this.isProd
-      ? this.logger.log(JSON.stringify({ event: 'request.incoming', ...log }))
-      : this.logger.log(
-          `${message} | id=${log.requestId} ip=${log.ip}${log.userId ? ` user=${log.userId}` : ''}`,
-        );
+    if (this.isProd) {
+      this.logger.log(JSON.stringify({ event: 'request.incoming', ...log }));
+    } else {
+      this.logger.log(
+        `${message} | id=${log.requestId} ip=${log.ip}${log.userId ? ` user=${log.userId}` : ''}`,
+      );
+    }
   }
 
   private logOutgoing(log: ResponseLog): void {
diff --git a/src/courses/courses.controller.ts b/src/courses/courses.controller.ts
index c6604387..6239bd0e 100644
--- a/src/courses/courses.controller.ts
+++ b/src/courses/courses.controller.ts
@@ -1,4 +1,15 @@
-import { Controller, Get, Post, Body, Patch, Param, Delete, Query } from '@nestjs/common';
+import {
+  Controller,
+  Get,
+  Post,
+  Body,
+  Patch,
+  Param,
+  Delete,
+  Query,
+  UseGuards,
+  Request,
+} from '@nestjs/common';
 import { CoursesService } from './courses.service';
 import { CreateCourseDto } from './dto/create-course.dto';
 import { UpdateCourseDto } from './dto/update-course.dto';
@@ -8,6 +19,7 @@ import { CreateModuleDto } from './dto/create-module.dto';
 import { LessonsService } from './lessons/lessons.service';
 import { CreateLessonDto } from './dto/create-lesson.dto';
 import { EnrollmentsService } from './enrollments/enrollments.service';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 
 @Controller('courses')
 export class CoursesController {
@@ -19,12 +31,13 @@ export class CoursesController {
   ) {}
 
   @Post()
-  create(@Body() createCourseDto: CreateCourseDto) {
-    // In a real app, user comes from req.user (JWT)
-    // For now, we'll assume a user is passed or we create a dummy one in service if needed
-    // But service expects User entity.
-    // We'll mock it here for simplicity of the API implementation task
-    const user = { id: '00000000-0000-0000-0000-000000000000' } as any;
+  @UseGuards(JwtAuthGuard)
+  create(@Request() req, @Body() createCourseDto: CreateCourseDto) {
+    // Get user from JWT token
+    const user = req.user;
+    if (!user || !user.id) {
+      throw new Error('User not authenticated');
+    }
     return this.coursesService.create({
       ...createCourseDto,
       instructorId: user.id,
@@ -37,7 +50,8 @@ export class CoursesController {
   }
 
   @Get('analytics')
-  getAnalytics() {
+  @UseGuards(JwtAuthGuard)
+  getAnalytics(@Request() req) {
     return this.coursesService.getAnalytics();
   }
 
@@ -47,33 +61,49 @@ export class CoursesController {
   }
 
   @Patch(':id')
+  @UseGuards(JwtAuthGuard)
   update(@Param('id') id: string, @Body() updateCourseDto: UpdateCourseDto) {
     return this.coursesService.update(id, updateCourseDto);
   }
 
   @Delete(':id')
+  @UseGuards(JwtAuthGuard)
   remove(@Param('id') id: string) {
     return this.coursesService.remove(id);
   }
 
   // Modules
   @Post(':id/modules')
-  createModule(@Param('id') courseId: string, @Body() createModuleDto: CreateModuleDto) {
+  @UseGuards(JwtAuthGuard)
+  createModule(
+    @Request() req,
+    @Param('id') courseId: string,
+    @Body() createModuleDto: CreateModuleDto,
+  ) {
     createModuleDto.courseId = courseId;
     return this.modulesService.create(createModuleDto);
   }
 
   // Lessons
   @Post('modules/:moduleId/lessons')
-  createLesson(@Param('moduleId') moduleId: string, @Body() createLessonDto: CreateLessonDto) {
+  @UseGuards(JwtAuthGuard)
+  createLesson(
+    @Request() req,
+    @Param('moduleId') moduleId: string,
+    @Body() createLessonDto: CreateLessonDto,
+  ) {
     createLessonDto.moduleId = moduleId;
     return this.lessonsService.create(createLessonDto);
   }
 
   // Enrollments
   @Post(':id/enroll')
-  enroll(@Param('id') courseId: string) {
-    const userId = '00000000-0000-0000-0000-000000000000'; // Placeholder
+  @UseGuards(JwtAuthGuard)
+  enroll(@Request() req, @Param('id') courseId: string) {
+    const userId = req.user.id;
+    if (!userId) {
+      throw new Error('User not authenticated');
+    }
     return this.enrollmentsService.enroll(userId, courseId);
   }
 }
diff --git a/src/courses/dto/update-course.dto.ts b/src/courses/dto/update-course.dto.ts
index ef560a3e..28f8c93c 100644
--- a/src/courses/dto/update-course.dto.ts
+++ b/src/courses/dto/update-course.dto.ts
@@ -1,7 +1,6 @@
-import { PartialType } from '@nestjs/swagger';
 import { CreateCourseDto } from './create-course.dto';
+import { PartialType, ApiPropertyOptional } from '@nestjs/swagger';
 import { IsString, IsOptional, IsEnum } from 'class-validator';
-import { ApiPropertyOptional } from '@nestjs/swagger';
 
 export class UpdateCourseDto extends PartialType(CreateCourseDto) {
   @ApiPropertyOptional({ enum: ['draft', 'published', 'archived'] })
diff --git a/src/data-warehouse/loading/incremental-loader.service.ts b/src/data-warehouse/loading/incremental-loader.service.ts
index 5ac05752..0399c861 100644
--- a/src/data-warehouse/loading/incremental-loader.service.ts
+++ b/src/data-warehouse/loading/incremental-loader.service.ts
@@ -134,34 +134,38 @@ export class IncrementalLoaderService {
       let recordsDeleted = 0;
 
       switch (job.config.loadType) {
-        case 'timestamp':
+        case 'timestamp': {
           const timestampResult = await this.loadByTimestamp(job);
           recordsProcessed = timestampResult.processed;
           recordsInserted = timestampResult.inserted;
           recordsUpdated = timestampResult.updated;
           break;
+        }
 
-        case 'sequence':
+        case 'sequence': {
           const sequenceResult = await this.loadBySequence(job);
           recordsProcessed = sequenceResult.processed;
           recordsInserted = sequenceResult.inserted;
           recordsUpdated = sequenceResult.updated;
           break;
+        }
 
-        case 'watermark':
+        case 'watermark': {
           const watermarkResult = await this.loadByWatermark(job);
           recordsProcessed = watermarkResult.processed;
           recordsInserted = watermarkResult.inserted;
           recordsUpdated = watermarkResult.updated;
           break;
+        }
 
-        case 'cdc':
+        case 'cdc': {
           const cdcResult = await this.loadByCDC(job);
           recordsProcessed = cdcResult.processed;
           recordsInserted = cdcResult.inserted;
           recordsUpdated = cdcResult.updated;
           recordsDeleted = cdcResult.deleted;
           break;
+        }
       }
 
       job.status = 'completed';
diff --git a/src/data-warehouse/quality/data-quality.service.ts b/src/data-warehouse/quality/data-quality.service.ts
index eecffb9a..7a9929cf 100644
--- a/src/data-warehouse/quality/data-quality.service.ts
+++ b/src/data-warehouse/quality/data-quality.service.ts
@@ -506,11 +506,12 @@ export class DataQualityService {
         return value !== '' && value !== null && value !== undefined;
       case 'valid email format':
         return typeof value === 'string' && /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
-      case 'within last 5 years':
+      case 'within last 5 years': {
         const date = new Date(value);
         const fiveYearsAgo = new Date();
         fiveYearsAgo.setFullYear(fiveYearsAgo.getFullYear() - 5);
         return date >= fiveYearsAgo;
+      }
       default:
         return true;
     }
diff --git a/src/rate-limiting/rate-limiting.controller.spec.ts b/src/rate-limiting/rate-limiting.controller.spec.ts
index 77dc8537..1040ae69 100644
--- a/src/rate-limiting/rate-limiting.controller.spec.ts
+++ b/src/rate-limiting/rate-limiting.controller.spec.ts
@@ -1,6 +1,7 @@
 import { Test, TestingModule } from '@nestjs/testing';
 import { RateLimitingController } from './rate-limiting.controller';
 import { RateLimitingService } from './rate-limiting.service';
+import { ThrottlingService } from './services/throttling.service';
 
 describe('RateLimitingController', () => {
   let controller: RateLimitingController;
@@ -8,7 +9,15 @@ describe('RateLimitingController', () => {
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
       controllers: [RateLimitingController],
-      providers: [RateLimitingService],
+      providers: [
+        RateLimitingService,
+        {
+          provide: ThrottlingService,
+          useValue: {
+            checkLimit: jest.fn(),
+          },
+        },
+      ],
     }).compile();
 
     controller = module.get<RateLimitingController>(RateLimitingController);
diff --git a/src/rate-limiting/rate-limiting.controller.ts b/src/rate-limiting/rate-limiting.controller.ts
index 9dd1f6f8..fcee8a74 100644
--- a/src/rate-limiting/rate-limiting.controller.ts
+++ b/src/rate-limiting/rate-limiting.controller.ts
@@ -3,7 +3,7 @@ import { RateLimitingService } from './rate-limiting.service';
 import { RateLimitGuard } from './services/limit-guard/guard';
 import { CreateRateLimitingDto } from './dto/create-rate-limiting.dto';
 import { UpdateRateLimitingDto } from './dto/update-rate-limiting.dto';
-import { JwtAuthGuard } from 'src/auth/guards/jwt-auth.guard';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 
 @Controller('rate-limiting')
 export class RateLimitingController {
diff --git a/src/rate-limiting/services/limit-guard/guard.ts b/src/rate-limiting/services/limit-guard/guard.ts
index d85bf99e..7bea66f6 100644
--- a/src/rate-limiting/services/limit-guard/guard.ts
+++ b/src/rate-limiting/services/limit-guard/guard.ts
@@ -1,5 +1,5 @@
 import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
-import { RateLimitingService } from 'src/rate-limiting/rate-limiting.service';
+import { RateLimitingService } from '../../rate-limiting.service';
 
 @Injectable()
 export class RateLimitGuard implements CanActivate {
diff --git a/src/users/entities/user.entity.ts b/src/users/entities/user.entity.ts
index 6850d615..115ed282 100644
--- a/src/users/entities/user.entity.ts
+++ b/src/users/entities/user.entity.ts
@@ -7,8 +7,8 @@ import {
   Index,
   OneToMany,
 } from 'typeorm';
-import { Course } from 'src/courses/entities/course.entity';
-import { Enrollment } from 'src/courses/entities/enrollment.entity';
+import { Course } from '../../courses/entities/course.entity';
+import { Enrollment } from '../../courses/entities/enrollment.entity';
 
 export enum UserRole {
   STUDENT = 'student',
diff --git a/test/utils/check-coverage-summary.js b/test/utils/check-coverage-summary.js
index d258a6bc..c8618ed0 100644
--- a/test/utils/check-coverage-summary.js
+++ b/test/utils/check-coverage-summary.js
@@ -1,5 +1,9 @@
-const fs = require('fs');
-const path = require('path');
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
 
 const summaryPath = path.resolve(process.cwd(), 'coverage/coverage-summary.json');
 
@@ -32,9 +36,7 @@ for (const metric of metrics) {
 if (failed.length > 0) {
   console.error('Coverage threshold check failed:');
   for (const { metric, actual, expected } of failed) {
-    console.error(
-      ` - ${metric}: ${actual.toFixed(2)}% is below required ${expected}%`,
-    );
+    console.error(` - ${metric}: ${actual.toFixed(2)}% is below required ${expected}%`);
   }
   process.exit(1);
 }