Replace SQLModel with SQLAlchemy + Pydantic

- Migrated from SQLModel to pure SQLAlchemy ORM with declarative base
- Separated ORM models from Pydantic schemas for better type safety
- Updated all CRUD operations to use SQLAlchemy session patterns
- Fixed query execution patterns (.exec() → .execute() with scalar methods)
- Updated all Alembic migrations to remove SQLModel dependencies
- Updated all test files to use SQLAlchemy patterns
- Added httptools>=0.6.0 for Python 3.13 compatibility
- Maintained API compatibility with existing endpoints

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sermetege

.DS_Store

@@ -18,10 +18,10 @@
 # target_metadata = mymodel.Base.metadata
 # target_metadata = None
 
-from app.models import SQLModel  # noqa
+from app.models import Base  # noqa
 from app.core.config import settings # noqa
 
-target_metadata = SQLModel.metadata
+target_metadata = Base.metadata
 
 # other values from the config, defined by the needs of env.py,
 # can be acquired:

backend/app/alembic/env.py

@@ -7,7 +7,7 @@
 """
 from alembic import op
 import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
 
 
 # revision identifiers, used by Alembic.

backend/app/alembic/versions/1a31ce608336_add_cascade_delete_relationships.py

@@ -7,7 +7,7 @@
 """
 from alembic import op
 import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
 
 
 # revision identifiers, used by Alembic.

backend/app/alembic/versions/9c0a54914c78_add_max_length_for_string_varchar_.py

@@ -7,7 +7,6 @@
 """
 from alembic import op
 import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
 from sqlalchemy.dialects import postgresql
 
 

backend/app/alembic/versions/d98dd8ec85a3_edit_replace_id_integers_in_all_models_.py

@@ -6,7 +6,7 @@
 
 """
 import sqlalchemy as sa
-import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
 from alembic import op
 
 # revision identifiers, used by Alembic.
@@ -20,22 +20,22 @@ def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
     op.create_table(
         "user",
-        sa.Column("email", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("email", sa.String(255), nullable=False),
         sa.Column("is_active", sa.Boolean(), nullable=False),
         sa.Column("is_superuser", sa.Boolean(), nullable=False),
-        sa.Column("full_name", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+        sa.Column("full_name", sa.String(255), nullable=True),
         sa.Column("id", sa.Integer(), nullable=False),
         sa.Column(
-            "hashed_password", sqlmodel.sql.sqltypes.AutoString(), nullable=False
+            "hashed_password", sa.String(), nullable=False
         ),
         sa.PrimaryKeyConstraint("id"),
     )
     op.create_index(op.f("ix_user_email"), "user", ["email"], unique=True)
     op.create_table(
         "item",
-        sa.Column("description", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+        sa.Column("description", sa.Text(), nullable=True),
         sa.Column("id", sa.Integer(), nullable=False),
-        sa.Column("title", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("title", sa.String(255), nullable=False),
         sa.Column("owner_id", sa.Integer(), nullable=False),
         sa.ForeignKeyConstraint(
             ["owner_id"],

backend/app/alembic/versions/e2412789c190_initialize_models.py

@@ -6,11 +6,11 @@
 from fastapi.security import OAuth2PasswordBearer
 from jwt.exceptions import InvalidTokenError
 from pydantic import ValidationError
-from sqlmodel import Session
+from sqlalchemy.orm import Session
 
 from app.core import security
 from app.core.config import settings
-from app.core.db import engine
+from app.core.db import SessionLocal
 from app.models import TokenPayload, User
 
 reusable_oauth2 = OAuth2PasswordBearer(
@@ -19,8 +19,11 @@
 
 
 def get_db() -> Generator[Session, None, None]:
-    with Session(engine) as session:
-        yield session
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
 
 
 SessionDep = Annotated[Session, Depends(get_db)]

backend/app/api/deps.py

@@ -2,7 +2,7 @@
 from typing import Any
 
 from fastapi import APIRouter, HTTPException
-from sqlmodel import func, select
+from sqlalchemy import func, select
 
 from app.api.deps import CurrentUser, SessionDep
 from app.models import Item, ItemCreate, ItemPublic, ItemsPublic, ItemUpdate, Message
@@ -20,23 +20,23 @@ def read_items(
 
     if current_user.is_superuser:
         count_statement = select(func.count()).select_from(Item)
-        count = session.exec(count_statement).one()
+        count = session.execute(count_statement).scalar_one()
         statement = select(Item).offset(skip).limit(limit)
-        items = session.exec(statement).all()
+        items = session.execute(statement).scalars().all()
     else:
         count_statement = (
             select(func.count())
             .select_from(Item)
             .where(Item.owner_id == current_user.id)
         )
-        count = session.exec(count_statement).one()
+        count = session.execute(count_statement).scalar_one()
         statement = (
             select(Item)
             .where(Item.owner_id == current_user.id)
             .offset(skip)
             .limit(limit)
         )
-        items = session.exec(statement).all()
+        items = session.execute(statement).scalars().all()
 
     return ItemsPublic(data=items, count=count)
 

backend/app/api/routes/items.py

@@ -2,7 +2,7 @@
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException
-from sqlmodel import col, delete, func, select
+from sqlalchemy import func, select, delete
 
 from app import crud
 from app.api.deps import (
@@ -40,10 +40,10 @@ def read_users(session: SessionDep, skip: int = 0, limit: int = 100) -> Any:
     """
 
     count_statement = select(func.count()).select_from(User)
-    count = session.exec(count_statement).one()
+    count = session.execute(count_statement).scalar_one()
 
     statement = select(User).offset(skip).limit(limit)
-    users = session.exec(statement).all()
+    users = session.execute(statement).scalars().all()
 
     return UsersPublic(data=users, count=count)
 
@@ -219,8 +219,8 @@ def delete_user(
         raise HTTPException(
             status_code=403, detail="Super users are not allowed to delete themselves"
         )
-    statement = delete(Item).where(col(Item.owner_id) == user_id)
-    session.exec(statement)  # type: ignore
+    statement = delete(Item).where(Item.owner_id == user_id)
+    session.execute(statement)
     session.delete(user)
     session.commit()
     return Message(message="User deleted successfully")

backend/app/api/routes/users.py

@@ -1,7 +1,7 @@
 import logging
 
-from sqlalchemy import Engine
-from sqlmodel import Session, select
+from sqlalchemy import Engine, select
+from sqlalchemy.orm import Session
 from tenacity import after_log, before_log, retry, stop_after_attempt, wait_fixed
 
 from app.core.db import engine
@@ -23,7 +23,7 @@ def init(db_engine: Engine) -> None:
     try:
         with Session(db_engine) as session:
             # Try to create session to check if DB is awake
-            session.exec(select(1))
+            session.execute(select(1))
     except Exception as e:
         logger.error(e)
         raise e