diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 772b37c6..31d1d0d3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -37,13 +37,17 @@ jobs:
         working-directory: ./backend
         run: npm run prisma:generate
 
-      - name: Verify generated Prisma client is typed
-        working-directory: ./backend
-        run: |
-          if ! grep -q "export \* from '.prisma/client/default'" node_modules/@prisma/client/index.d.ts; then
-            echo "Prisma client export is unexpected";
-            exit 1;
-          fi
+      - name: Verify generated Prisma client is typed
+        working-directory: ./backend
+        run: |
+          if ! grep -q "export \* from '.prisma/client/default'" node_modules/@prisma/client/index.d.ts; then
+            echo "Prisma client export is unexpected";
+            exit 1;
+          fi
+
+      - name: Lint backend
+        working-directory: ./backend
+        run: npm run lint
 
       - name: Build NestJS app
         working-directory: ./backend
@@ -79,13 +83,17 @@ jobs:
         working-directory: ./backend
         run: npm run prisma:generate
 
-      - name: Verify generated Prisma client is typed
-        working-directory: ./backend
-        run: |
-          if ! grep -q "export \* from '.prisma/client/default'" node_modules/@prisma/client/index.d.ts; then
-            echo "Prisma client export is unexpected";
-            exit 1;
-          fi
+      - name: Verify generated Prisma client is typed
+        working-directory: ./backend
+        run: |
+          if ! grep -q "export \* from '.prisma/client/default'" node_modules/@prisma/client/index.d.ts; then
+            echo "Prisma client export is unexpected";
+            exit 1;
+          fi
+
+      - name: Lint backend
+        working-directory: ./backend
+        run: npm run lint
 
       - name: Dependency audit (high+critical)
         working-directory: ./backend
diff --git a/backend/eslint.config.mjs b/backend/eslint.config.mjs
new file mode 100644
index 00000000..31a4c21b
--- /dev/null
+++ b/backend/eslint.config.mjs
@@ -0,0 +1,26 @@
+import tseslint from '@typescript-eslint/eslint-plugin';
+import tsParser from '@typescript-eslint/parser';
+
+export default [
+  {
+    ignores: ['dist/**', 'node_modules/**'],
+  },
+  {
+    files: ['src/**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        sourceType: 'module',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tseslint,
+    },
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
+      ],
+    },
+  },
+];
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 8f8bb33a..344e6b7b 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -40,6 +40,9 @@
         "@types/passport-jwt": "^4.0.1",
         "@types/supertest": "^7.2.0",
         "@types/uuid": "^10.0.0",
+        "@typescript-eslint/eslint-plugin": "^8.46.2",
+        "@typescript-eslint/parser": "^8.46.2",
+        "eslint": "^9.38.0",
         "jest": "^29.7.0",
         "supertest": "^7.2.2",
         "ts-jest": "^29.2.6",
@@ -723,6 +726,237 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.9.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
+      "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.21.2",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.2.tgz",
+      "integrity": "sha512-nJl2KGTlrf9GjLimgIru+V/mzgSK0ABCDQRvxw5BjURL7WfH5uoWmizbH7QB6MmnMBd8cIC9uceWnezL1VZWWw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/object-schema": "^2.1.7",
+        "debug": "^4.3.1",
+        "minimatch": "^3.1.5"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/config-helpers": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
+      "integrity": "sha512-gBrxN88gOIf3R7ja5K9slwNayVcZgK6SOUORm2uBzTeIEfeVaIhOpCtTox3P6R7o2jLFwLFTLnC7kU/RGcYEgw==",
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+      "dependencies": {
+        "@eslint/core": "^0.17.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/core": {
+      "version": "0.17.0",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
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+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
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+    "node_modules/@eslint/eslintrc": {
+      "version": "3.3.5",
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+        "globals": "^14.0.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.1.1",
+        "minimatch": "^3.1.5",
+        "strip-json-comments": "^3.1.1"
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/core": "^0.19.2",
+        "@humanfs/types": "^0.15.0",
+        "@humanwhocodes/retry": "^0.4.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanfs/types": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/@humanfs/types/-/types-0.15.0.tgz",
+      "integrity": "sha512-ZZ1w0aoQkwuUuC7Yf+7sdeaNfqQiiLcSRbfI08oAxqLtpXQr9AIVX7Ay7HLDuiLYAaFPu8oBYNq/QIi9URHJ3Q==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
+      "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+      "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
     "node_modules/@img/sharp-darwin-arm64": {
       "version": "0.33.5",
       "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.33.5.tgz",
@@ -2684,6 +2918,278 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@typescript-eslint/eslint-plugin": {
+      "version": "8.59.4",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.59.4.tgz",
+      "integrity": "sha512-PegsU+XfyJJNjd4+u/k6f9yTyp0lEXXiPopUNobZcIAUJFGICFLN+sP0Rb3JehVmiij1Ph0dFGYqODoRo/2+6A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@eslint-community/regexpp": "^4.12.2",
+        "@typescript-eslint/scope-manager": "8.59.4",
+        "@typescript-eslint/type-utils": "8.59.4",
+        "@typescript-eslint/utils": "8.59.4",
+        "@typescript-eslint/visitor-keys": "8.59.4",
+        "ignore": "^7.0.5",
+        "natural-compare": "^1.4.0",
+        "ts-api-utils": "^2.5.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "@typescript-eslint/parser": "^8.59.4",
+        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
+        "typescript": ">=4.8.4 <6.1.0"
+      }
+    },
+    "node_modules/@typescript-eslint/parser": {
+      "version": "8.59.4",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.59.4.tgz",
+      "integrity": "sha512-zORHqO/tuhxY1zWuTvMUqddRxpiFJ72xVfcNoWpqdLjs6lfPbuQBJuW4pk+49/uBMy7Ssr4bzgjiKmmDB1UbZQ==",
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+      "license": "MIT",
+      "dependencies": {
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+        "@typescript-eslint/types": "8.59.4",
+        "@typescript-eslint/typescript-estree": "8.59.4",
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+        "debug": "^4.4.3"
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+        "type": "opencollective",
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+        "typescript": ">=4.8.4 <6.1.0"
+      }
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+      "version": "8.59.4",
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+        "@typescript-eslint/types": "^8.59.4",
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+        "@typescript-eslint/visitor-keys": "8.59.4"
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       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
@@ -4469,6 +5265,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/fast-levenshtein": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
+      "integrity": "sha512-DCXu6Ifhqcks7TZKY3Hxp3y6qphY5SJZmrWMDrKcERSOXWQdMhU9Ig/PYrzyw/ul9jOIyh0N4M0tbC5hodg8dw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/fast-safe-stringify": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/fast-safe-stringify/-/fast-safe-stringify-2.1.1.tgz",
@@ -4502,6 +5305,37 @@
         "bser": "2.1.1"
       }
     },
+    "node_modules/fdir": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
+      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "peerDependencies": {
+        "picomatch": "^3 || ^4"
+      },
+      "peerDependenciesMeta": {
+        "picomatch": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/file-entry-cache": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
+      "integrity": "sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "flat-cache": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/file-type": {
       "version": "21.3.4",
       "resolved": "https://registry.npmjs.org/file-type/-/file-type-21.3.4.tgz",
@@ -4568,6 +5402,27 @@
         "node": ">=8"
       }
     },
+    "node_modules/flat-cache": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-4.0.1.tgz",
+      "integrity": "sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "flatted": "^3.2.9",
+        "keyv": "^4.5.4"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/flatted": {
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.2.tgz",
+      "integrity": "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/fork-ts-checker-webpack-plugin": {
       "version": "9.1.0",
       "resolved": "https://registry.npmjs.org/fork-ts-checker-webpack-plugin/-/fork-ts-checker-webpack-plugin-9.1.0.tgz",
@@ -4800,6 +5655,19 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/glob-parent": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
+      "integrity": "sha512-XxwI8EOhVQgWp6iDL+3b0r86f4d6AX6zSU55HfB4ydCEuXLXc5FcYeOu+nnGftS4TEju/11rt4KJPTMgbfmv4A==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "is-glob": "^4.0.3"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
     "node_modules/glob-to-regexp": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/glob-to-regexp/-/glob-to-regexp-0.4.1.tgz",
@@ -4846,6 +5714,19 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/globals": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/gopd": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/gopd/-/gopd-1.2.0.tgz",
@@ -5029,6 +5910,16 @@
       ],
       "license": "BSD-3-Clause"
     },
+    "node_modules/ignore": {
+      "version": "7.0.5",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-7.0.5.tgz",
+      "integrity": "sha512-Hs59xBNfUIunMFgWAbGX5cq6893IbWg4KnrjbYwX3tx0ztorVgTDA6B2sxf8ejHJ4wz8BqGUMYlnzNBer5NvGg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4"
+      }
+    },
     "node_modules/import-fresh": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.3.1.tgz",
@@ -5126,6 +6017,16 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/is-extglob": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
+      "integrity": "sha512-SbKbANkN603Vi4jEZv49LeVJMn4yGwsbzZworEoyEiutsN3nJYdbO36zfhGJ6QEDpOZIFkDtnq5JRxmvl3jsoQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/is-fullwidth-code-point": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
@@ -5146,6 +6047,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/is-glob": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.3.tgz",
+      "integrity": "sha512-xelSayHH36ZgE7ZWhli7pW34hNbNl8Ojv5KVmkJD4hBdD3th8Tfk9vYasLM+mXWOZhFkgZfxhLSnrwRr4elSSg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "is-extglob": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/is-interactive": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-interactive/-/is-interactive-1.0.0.tgz",
@@ -6071,6 +6985,13 @@
         "node": ">=6"
       }
     },
+    "node_modules/json-buffer": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/json-buffer/-/json-buffer-3.0.1.tgz",
+      "integrity": "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/json-parse-even-better-errors": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz",
@@ -6085,6 +7006,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/json-stable-stringify-without-jsonify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
+      "integrity": "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/json5": {
       "version": "2.2.3",
       "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
@@ -6161,6 +7089,16 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "node_modules/keyv": {
+      "version": "4.5.4",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
+      "integrity": "sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "json-buffer": "3.0.1"
+      }
+    },
     "node_modules/kleur": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/kleur/-/kleur-3.0.3.tgz",
@@ -6181,6 +7119,20 @@
         "node": ">=6"
       }
     },
+    "node_modules/levn": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1",
+        "type-check": "~0.4.0"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/libphonenumber-js": {
       "version": "1.12.41",
       "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.12.41.tgz",
@@ -6290,6 +7242,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lodash.merge": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+      "integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lodash.once": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
@@ -6709,6 +7668,24 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/optionator": {
+      "version": "0.9.4",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
+      "integrity": "sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "deep-is": "^0.1.3",
+        "fast-levenshtein": "^2.0.6",
+        "levn": "^0.4.1",
+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.5"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/ora": {
       "version": "5.4.1",
       "resolved": "https://registry.npmjs.org/ora/-/ora-5.4.1.tgz",
@@ -6997,6 +7974,16 @@
         "node": ">=4"
       }
     },
+    "node_modules/prelude-ls": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/pretty-format": {
       "version": "29.7.0",
       "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-29.7.0.tgz",
@@ -8100,6 +9087,23 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/tinyglobby": {
+      "version": "0.2.16",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.16.tgz",
+      "integrity": "sha512-pn99VhoACYR8nFHhxqix+uvsbXineAasWm5ojXoN8xEwK5Kd3/TrhNn1wByuD52UxWRLy8pu+kRMniEi6Eq9Zg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
     "node_modules/tmpl": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -8147,6 +9151,19 @@
         "url": "https://github.com/sponsors/Borewit"
       }
     },
+    "node_modules/ts-api-utils": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.5.0.tgz",
+      "integrity": "sha512-OJ/ibxhPlqrMM0UiNHJ/0CKQkoKF243/AEmplt3qpRgkW8VG7IfOS41h7V8TjITqdByHzrjcS/2si+y4lIh8NA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.12"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.8.4"
+      }
+    },
     "node_modules/ts-jest": {
       "version": "29.4.9",
       "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.4.9.tgz",
@@ -8250,6 +9267,19 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -8654,6 +9684,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
diff --git a/backend/package.json b/backend/package.json
index c9fb08ee..01a29b2a 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -11,8 +11,9 @@
     "prisma:migrate": "prisma migrate dev",
     "prisma:deploy": "prisma migrate deploy",
     "typecheck": "tsc --noEmit",
+    "lint": "eslint \"src/**/*.ts\"",
     "audit:high": "npm audit --audit-level=high",
-    "quality:ci": "npm run prisma:validate && npm run prisma:generate && npm run typecheck && npm test && npm run build && npm run audit:high",
+    "quality:ci": "npm run prisma:validate && npm run prisma:generate && npm run typecheck && npm run lint && npm test && npm run build && npm run audit:high",
     "test": "jest",
     "test:watch": "jest --watch"
   },
@@ -49,6 +50,9 @@
     "@types/passport-jwt": "^4.0.1",
     "@types/supertest": "^7.2.0",
     "@types/uuid": "^10.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.46.2",
+    "@typescript-eslint/parser": "^8.46.2",
+    "eslint": "^9.38.0",
     "jest": "^29.7.0",
     "supertest": "^7.2.2",
     "ts-jest": "^29.2.6",
diff --git a/backend/src/prisma/prisma.service.ts b/backend/src/prisma/prisma.service.ts
index aa256f4a..35d5d676 100644
--- a/backend/src/prisma/prisma.service.ts
+++ b/backend/src/prisma/prisma.service.ts
@@ -18,8 +18,29 @@ export class PrismaService
     'deleteMany',
   ]);
 
+  private static isTruthy(value?: string): boolean {
+    if (!value) {
+      return false;
+    }
+
+    const normalized = value.trim().toLowerCase();
+    return normalized === '1' || normalized === 'true' || normalized === 'yes' || normalized === 'on';
+  }
+
+  private static resolveLogConfig(): Prisma.LogLevel[] {
+    const includeQueryLogs = PrismaService.isTruthy(process.env.PRISMA_LOG_QUERIES);
+
+    if (includeQueryLogs) {
+      return ['query', 'warn', 'error'];
+    }
+
+    return ['warn', 'error'];
+  }
+
   constructor(private readonly realtimeEvents: RealtimeEventsService) {
-    super();
+    super({
+      log: PrismaService.resolveLogConfig(),
+    });
 
     const realtimeMiddleware: Prisma.Middleware = async (params, next) => {
       const result = await next(params);
@@ -46,6 +67,10 @@ export class PrismaService
 
         await this.$connect();
 
+        if (PrismaService.isTruthy(process.env.PRISMA_LOG_QUERIES)) {
+          this.logger.log('Prisma query logging är aktiverad (PRISMA_LOG_QUERIES=1).');
+        }
+
         this.logger.log('Databasanslutning etablerad.');
         return;
       } catch (error) {
@@ -71,4 +96,4 @@ export class PrismaService
   async onModuleDestroy() {
     await this.$disconnect();
   }
-}
\ No newline at end of file
+}
diff --git a/backend/src/receipt-import/receipt-import.security.spec.ts b/backend/src/receipt-import/receipt-import.security.spec.ts
index 77f1cc05..d65b9ff7 100644
--- a/backend/src/receipt-import/receipt-import.security.spec.ts
+++ b/backend/src/receipt-import/receipt-import.security.spec.ts
@@ -1,4 +1,4 @@
-import { BadRequestException } from '@nestjs/common';
+import { BadRequestException, UnauthorizedException } from '@nestjs/common';
 import { ReceiptImportController } from './receipt-import.controller';
 
 describe('ReceiptImport controller security', () => {
@@ -55,11 +55,11 @@ describe('ReceiptImport controller security', () => {
     expect(receiptImportServiceMock.upsertUnitMapping).toHaveBeenCalledWith(99, 1, 'g', 'kg');
   });
 
-  it('upsertUnitMapping nekar när användar-id saknas', async () => {
-    await expect(
-      controller.upsertUnitMapping({ productId: 1, originalUnit: 'g', preferredUnit: 'kg' } as any, { user: {} }),
-    ).rejects.toThrow(BadRequestException);
-  });
+  it('upsertUnitMapping nekar när användar-id saknas', async () => {
+    await expect(
+      controller.upsertUnitMapping({ productId: 1, originalUnit: 'g', preferredUnit: 'kg' } as any, { user: {} }),
+    ).rejects.toThrow(UnauthorizedException);
+  });
 
   it('saveReceipt nekar global alias för icke-admin', async () => {
     const dto = {
diff --git a/compose.yml b/compose.yml
index 2408dfdb..9aad8ce9 100644
--- a/compose.yml
+++ b/compose.yml
@@ -18,6 +18,7 @@ services:
       SEED_USER2_PASSWORD: "${SEED_USER2_PASSWORD}"
       IMPORTER_SERVICE_URL: "http://importer-api:3001"
       RECEIPT_TRACE_DECISIONS: "${RECEIPT_TRACE_DECISIONS:-0}"
+      PRISMA_LOG_QUERIES: "${PRISMA_LOG_QUERIES:-0}"
     volumes:
       - recipe_images:/app/recipe-images
     depends_on:
diff --git a/flutter/analysis_options.yaml b/flutter/analysis_options.yaml
new file mode 100644
index 00000000..d8aa88b1
--- /dev/null
+++ b/flutter/analysis_options.yaml
@@ -0,0 +1,5 @@
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  rules:
+    avoid_print: true