feat: Add API endpoint for managing categories

tests/conftest.py

@@ -46,6 +46,24 @@ def initialize_test_db():
             await conn.run_sync(Base.metadata.drop_all)
             await conn.run_sync(Base.metadata.create_all)
 
+        # Seed categories in test DB
+        from sqlalchemy.ext.asyncio import AsyncSession
+        from app.db.models.category import Category
+
+        async with AsyncSession(test_engine) as session:
+            defaults = [
+                Category(name="Food"),
+                Category(name="Shopping"),
+                Category(name="Travel"),
+                Category(name="Transport"),
+                Category(name="Utilities"),
+                Category(name="Cash Withdrawal"),
+                Category(name="Entertainment"),
+                Category(name="Other"),
+            ]
+            session.add_all(defaults)
+            await session.commit()
+
     async def teardown_db():
         async with test_engine.begin() as conn:
             await conn.run_sync(Base.metadata.drop_all)