feat: add document schema and embedding generation

- Create documents and document_chunks tables with status tracking, cascading deletes, and chunk uniqueness constraints
- Enable pgvector and store 768-dimensional document embeddings
- Add an initial source metadata migration placeholder
- Add node-pg-migrate for database migration management
- Implement Ollama embedding generation using nomic-embed-text with timeout and response validation

db/migrations/001_create_documents.sql

@@ -0,0 +1,23 @@
+CREATE EXTENSION IF NOT EXISTS vector;
+
+CREATE TABLE documents (
+    id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    title TEXT NOT NULL,
+    source TEXT,
+    status TEXT NOT NULL DEFAULT 'pending'
+        CHECK (status IN ('pending', 'processing', 'completed', 'failed')),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE document_chunks (
+    id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    document_id BIGINT NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
+    chunk_index INTEGER NOT NULL CHECK (chunk_index >= 0),
+    content TEXT NOT NULL,
+    embedding vector(768) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (document_id, chunk_index)
+);
+
+CREATE INDEX document_chunks_document_id_idx
+    ON document_chunks (document_id);

db/migrations/002_add-document-source-metadata.sql

@@ -0,0 +1,3 @@
+-- Up Migration
+
+-- Down Migration

package-lock.json

@@ -10,6 +10,7 @@
       "license": "ISC",
       "dependencies": {
         "fastify": "^5.12.7",
+        "node-pg-migrate": "^9.0.0",
         "pg": "^8.23.1",
         "zod": "^4.6.7"
       },
@@ -599,7 +600,7 @@
       "version": "26.6.5",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-26.6.5.tgz",
       "integrity": "sha512-uMzsv9stDdofIZBx4UGh4Z9ZgXnGC9seRDscilBcTHAeOFk67MZg/k9bWVfO+bk4qZmG+l52hRnLwUiH2LnJTg==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "undici-types": "~8.9.0"
@@ -609,7 +610,7 @@
       "version": "8.23.1",
       "resolved": "https://registry.npmjs.org/@types/pg/-/pg-8.23.1.tgz",
       "integrity": "sha512-fKVHpikPdg4GKks3JuLEhvwSyvwzF23hnabPy6DD8ljVbC7+6J5dQzdv4arV6jqq57djnMgs1HKBxX4P8aBI3A==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT",
       "dependencies": {
         "@types/node": "*",
@@ -1012,6 +1013,30 @@
       ],
       "license": "BSD-3-Clause"
     },
+    "node_modules/ansi-regex": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.4.0.tgz",
+      "integrity": "sha512-KzTVk2tCWAHtYrvvvaP8bJKJq2pVinhLcGEQdtLIYPbmNGNyYe8QwNaTUYQp2J7/vIsUKt5QCqAfUkYyG9DkOw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/atomic-sleep": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/atomic-sleep/-/atomic-sleep-1.0.0.tgz",
@@ -1041,6 +1066,41 @@
         "fastq": "^1.17.1"
       }
     },
+    "node_modules/balanced-match": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
+      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
+      "license": "MIT",
+      "engines": {
+        "node": "18 || 20 || >=22"
+      }
+    },
+    "node_modules/brace-expansion": {
+      "version": "5.0.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.12.tgz",
+      "integrity": "sha512-YovQ3rzhaLMIrDjNDMkNS01tea93qhEhG5xy8f6+R0l+dw3Ki+5sCoIoI942iuLZTHWogWktgwVDhU09iNEimQ==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^4.0.2"
+      },
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/cliui": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-9.0.1.tgz",
+      "integrity": "sha512-k7ndgKhwoQveBL+/1tqGJYNz097I7WOvwbmmU2AR5+magtbjPWQTS1C5vzGkBC8Ym8UWRzfKUzUUqFLypY4Q+w==",
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^7.2.0",
+        "strip-ansi": "^7.1.0",
+        "wrap-ansi": "^9.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/cookie": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/cookie/-/cookie-2.0.1.tgz",
@@ -1063,6 +1123,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/emoji-regex": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-10.6.0.tgz",
+      "integrity": "sha512-toUI84YS5YmxW219erniWD0CIVOo46xGKColeNQRgOzDorgBi1v4D71/OFzgD9GO2UGKIv1C3Sp8DAn0+j5w7A==",
+      "license": "MIT"
+    },
     "node_modules/esbuild": {
       "version": "0.28.2",
       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.28.2.tgz",
@@ -1105,6 +1171,15 @@
         "@esbuild/win32-x64": "0.28.2"
       }
     },
+    "node_modules/escalade": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
+      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/fast-decode-uri-component": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/fast-decode-uri-component/-/fast-decode-uri-component-1.0.1.tgz",
@@ -1237,6 +1312,44 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "license": "ISC",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
+    "node_modules/get-east-asian-width": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/get-east-asian-width/-/get-east-asian-width-1.7.0.tgz",
+      "integrity": "sha512-XjH1AECxf0giL2V1aU8vKyRR2ppRUb5c0EvT7zuJTokQ74bNo52zOtghqdWIqrhUD79fo3x0WfKZdOqxF6LG1Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/glob": {
+      "version": "13.0.6",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-13.0.6.tgz",
+      "integrity": "sha512-Wjlyrolmm8uDpm/ogGyXZXb1Z+Ca2B8NbJwqBVg0axK9GbBeoS7yGV6vjXnYdGm6X53iehEuxxbyiKp8QmN4Vw==",
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "minimatch": "^10.2.2",
+        "minipass": "^7.1.3",
+        "path-scurry": "^2.0.2"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/ipaddr.js": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-2.5.0.tgz",
@@ -1246,6 +1359,15 @@
         "node": ">= 10"
       }
     },
+    "node_modules/jiti": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.7.0.tgz",
+      "integrity": "sha512-AC/7JofJvZGrrneWNaEnJeOLUx+JlGt7tNa0wZiRPT4MY1wmfKjt2+6O2p2uz2+skll8OZZmJMNqeke7kKbNgQ==",
+      "license": "MIT",
+      "bin": {
+        "jiti": "lib/jiti-cli.mjs"
+      }
+    },
     "node_modules/json-schema-ref-resolver": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/json-schema-ref-resolver/-/json-schema-ref-resolver-3.0.1.tgz",
@@ -1293,6 +1415,65 @@
         "set-cookie-parser": "^3.0.1"
       }
     },
+    "node_modules/lru-cache": {
+      "version": "11.5.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.3.tgz",
+      "integrity": "sha512-U4N8FgzmWxc8k1VH8Kr6lQg18U7Fjvby6wXHVRX/ZZ7IwWbRMgrRbP0Wrb5q5NVinryp4SQampHKdvtecItxUg==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/minimatch": {
+      "version": "10.2.6",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.6.tgz",
+      "integrity": "sha512-vpLQEs+VLCr1nU0BXS07maYoFwlDAH0gngQuuttxIwutDFEMHq2blX+8vpgxDdK3J1PwjCJiep77OitTZ4Ll1A==",
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "brace-expansion": "^5.0.8"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/minipass": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-7.1.3.tgz",
+      "integrity": "sha512-tEBHqDnIoM/1rXME1zgka9g6Q2lcoCkxHLuc7ODJ5BxbP5d4c2Z5cGgtXAku59200Cx7diuHTOYfSBD8n6mm8A==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=16 || 14 >=14.17"
+      }
+    },
+    "node_modules/node-pg-migrate": {
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/node-pg-migrate/-/node-pg-migrate-9.0.0.tgz",
+      "integrity": "sha512-lp5+UZx1KKgOz/y0h6BYGPuJ5wVlZTgiBPGXCGoX6Bs6X9LtiIhrI4V2yW4mPwnJBfptVq0KtLQtXHcoEKOyig==",
+      "license": "MIT",
+      "dependencies": {
+        "glob": "~13.0.0",
+        "jiti": "~2.7.0",
+        "yargs": "~18.0.0"
+      },
+      "bin": {
+        "node-pg-migrate": "bin/node-pg-migrate.js"
+      },
+      "engines": {
+        "node": ">=20.11.0"
+      },
+      "peerDependencies": {
+        "@types/pg": ">=6.0.0 <9.0.0",
+        "pg": ">=4.3.0 <9.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/pg": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/on-exit-leak-free": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/on-exit-leak-free/-/on-exit-leak-free-2.1.2.tgz",
@@ -1302,6 +1483,22 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/path-scurry": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/path-scurry/-/path-scurry-2.0.2.tgz",
+      "integrity": "sha512-3O/iVVsJAPsOnpwWIeD+d6z/7PmqApyQePUtCndjatj/9I5LylHvt5qluFaBT3I5h3r1ejfR056c+FCv+NnNXg==",
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "lru-cache": "^11.0.0",
+        "minipass": "^7.1.2"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/pg": {
       "version": "8.23.1",
       "resolved": "https://registry.npmjs.org/pg/-/pg-8.23.1.tgz",
@@ -1612,6 +1809,38 @@
         "node": ">= 10.x"
       }
     },
+    "node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
     "node_modules/thread-stream": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-4.2.0.tgz",
@@ -1691,9 +1920,26 @@
       "version": "8.9.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.9.0.tgz",
       "integrity": "sha512-KTDyRTYX8sWmKXAikPHHSyc63CRPETMctyjKFupcC6OBLXT3xsN0e9aF7m+mIXutFWpUXuedtowG7iLOzp0kQg==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT"
     },
+    "node_modules/wrap-ansi": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
+      "integrity": "sha512-42AtmgqjV+X1VpdOfyTGOYRi0/zsoLqtXQckTmqTeybT+BDIbM/Guxo7x3pE2vtpr1ok6xRqM9OpBe+Jyoqyww==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.2.1",
+        "string-width": "^7.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -1703,6 +1949,41 @@
         "node": ">=0.4"
       }
     },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs": {
+      "version": "18.0.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-18.0.0.tgz",
+      "integrity": "sha512-4UEqdc2RYGHZc7Doyqkrqiln3p9X2DZVxaGbwhn2pi7MrRagKaOcIKe8L3OxYcbhXLgLFUS3zAYuQjKBQgmuNg==",
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^9.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "string-width": "^7.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^22.0.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "22.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-22.0.0.tgz",
+      "integrity": "sha512-rwu/ClNdSMpkSrUb+d6BRsSkLUq1fmfsY6TOpYzTwvwkg1/NRG85KBy3kq++A8LKQwX6lsu+aWad+2khvuXrqw==",
+      "license": "ISC",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      }
+    },
     "node_modules/zod": {
       "version": "4.6.7",
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.6.7.tgz",

package.json

@@ -15,6 +15,7 @@
   "type": "module",
   "dependencies": {
     "fastify": "^5.12.7",
+    "node-pg-migrate": "^9.0.0",
     "pg": "^8.23.1",
     "zod": "^4.6.7"
   },

src/ollama.ts

@@ -1,9 +1,40 @@
 const OLLAMA_BASE_URL = "http://127.0.0.1:11434";
 
+interface OllamaEmbeddingResponse {
+  embeddings: number[][];
+}
+
 interface OllamaGenerateResponse {
   response: string;
 }
 
+export const generateEmbedding = async (text: string): Promise<number[]> => {
+  const response = await fetch(`${OLLAMA_BASE_URL}/api/embed`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      model: "nomic-embed-text",
+      input: text,
+    }),
+    signal: AbortSignal.timeout(30_000),
+  });
+
+  if (!response.ok) {
+    throw new Error(`Ollama embedding failed with status ${response.status}`);
+  }
+
+  const result = (await response.json()) as OllamaEmbeddingResponse;
+  const embedding = result.embeddings[0];
+
+  if (!embedding || embedding.length !== 768) {
+    throw new Error("Ollama returned an invalid embedding");
+  }
+
+  return embedding;
+};
+
 export const generateResponse = async (prompt: string): Promise<string> => {
   const response = await fetch(`${OLLAMA_BASE_URL}/api/generate`, {
     method: "POST",