diff --git a/prisma/migrations/20250323120019_fields_created_at/migration.sql b/prisma/migrations/20250323120019_fields_created_at/migration.sql
new file mode 100644
index 0000000..4d6d62e
--- /dev/null
+++ b/prisma/migrations/20250323120019_fields_created_at/migration.sql
@@ -0,0 +1,20 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_fields" (
+    "code" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "type" TEXT NOT NULL DEFAULT 'string',
+    "llm_prompt" TEXT,
+    "options" JSONB,
+    "created_at" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "is_visible_in_list" BOOLEAN NOT NULL DEFAULT false,
+    "is_visible_in_analysis" BOOLEAN NOT NULL DEFAULT false,
+    "is_required" BOOLEAN NOT NULL DEFAULT false,
+    "is_extra" BOOLEAN NOT NULL DEFAULT true
+);
+INSERT INTO "new_fields" ("code", "is_extra", "is_required", "is_visible_in_analysis", "is_visible_in_list", "llm_prompt", "name", "options", "type") SELECT "code", "is_extra", "is_required", "is_visible_in_analysis", "is_visible_in_list", "llm_prompt", "name", "options", "type" FROM "fields";
+DROP TABLE "fields";
+ALTER TABLE "new_fields" RENAME TO "fields";
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 9d85f16..a83680b 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -42,15 +42,16 @@ model Project {
 }
 
 model Field {
-  code                String  @id
+  code                String   @id
   name                String
-  type                String  @default("string")
+  type                String   @default("string")
   llm_prompt          String?
   options             Json?
-  isVisibleInList     Boolean @default(false) @map("is_visible_in_list")
-  isVisibleInAnalysis Boolean @default(false) @map("is_visible_in_analysis")
-  isRequired          Boolean @default(false) @map("is_required")
-  isExtra             Boolean @default(true) @map("is_extra")
+  createdAt           DateTime @default(now()) @map("created_at")
+  isVisibleInList     Boolean  @default(false) @map("is_visible_in_list")
+  isVisibleInAnalysis Boolean  @default(false) @map("is_visible_in_analysis")
+  isRequired          Boolean  @default(false) @map("is_required")
+  isExtra             Boolean  @default(true) @map("is_extra")
 
   @@map("fields")
 }
diff --git a/prisma/seed.js b/prisma/seed.js
index 877fc9a..3544049 100644
--- a/prisma/seed.js
+++ b/prisma/seed.js
@@ -332,10 +332,10 @@ const fields = [
     isExtra: false,
   },
   {
-    code: "categoryCode",
-    name: "Category",
+    code: "issuedAt",
+    name: "Issued At",
     type: "string",
-    llm_prompt: "category code, one of: {categories.code}",
+    llm_prompt: "issued at date (YYYY-MM-DD format)",
     isVisibleInList: true,
     isVisibleInAnalysis: true,
     isRequired: false,
@@ -352,10 +352,20 @@ const fields = [
     isExtra: false,
   },
   {
-    code: "issuedAt",
-    name: "Issued At",
+    code: "categoryCode",
+    name: "Category",
     type: "string",
-    llm_prompt: "issued at date (YYYY-MM-DD format)",
+    llm_prompt: "category code, one of: {categories.code}",
+    isVisibleInList: true,
+    isVisibleInAnalysis: true,
+    isRequired: false,
+    isExtra: false,
+  },
+  {
+    code: "files",
+    name: "Files",
+    type: "string",
+    llm_prompt: "",
     isVisibleInList: true,
     isVisibleInAnalysis: true,
     isRequired: false,
@@ -483,6 +493,13 @@ async function main() {
   }
 
   // Seed fields
+  await prisma.field.deleteMany({
+    where: {
+      code: {
+        in: fields.map((field) => field.code),
+      },
+    },
+  })
   for (const field of fields) {
     await prisma.field.upsert({
       where: { code: field.code },