categories as dropdown

src/db.ts

@@ -43,8 +43,34 @@ CREATE TABLE IF NOT EXISTS settings (
   value TEXT NOT NULL,
   updated_at TEXT NOT NULL
 );
+
+CREATE TABLE IF NOT EXISTS categories (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  name TEXT NOT NULL UNIQUE COLLATE NOCASE,
+  created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ','now'))
+);
 `);
 
+
+const defaultCategories = [
+  "Versicherung",
+  "Strom & Energie",
+  "Internet & Telefon",
+  "Miete & Wohnen",
+  "Mobilfunk",
+  "Streaming & Medien",
+  "Wartung & Service"
+];
+
+const categoryRow = db.prepare(`SELECT COUNT(*) as count FROM categories`).get() as { count: number } | undefined;
+const categoryCount = categoryRow?.count ?? 0;
+if (categoryCount === 0) {
+  const insertStmt = db.prepare(`INSERT OR IGNORE INTO categories (name) VALUES (?)`);
+  for (const name of defaultCategories) {
+    insertStmt.run(name);
+  }
+}
+
 export type ContractDbRow = {
   id: number;
   title: string;