diff --git a/Dockerfile b/Dockerfile
index 6379386..56a258e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,9 +4,9 @@ WORKDIR /app
 Copy pyproject.toml /app
 COPY learn_sql_model/__about__.py /app/learn_sql_model/__about__.py
 COPY README.md /app
-RUN pip3 install '.[api]'
+RUN pip3 install '.[all]'
 COPY . /app
-RUN pip3 install '.[api]'
+RUN pip3 install '.[all]'
 
 EXPOSE 5000
 
diff --git a/learn_sql_model/api/hero.py b/learn_sql_model/api/hero.py
index b8d20da..25c41d5 100644
--- a/learn_sql_model/api/hero.py
+++ b/learn_sql_model/api/hero.py
@@ -8,13 +8,13 @@ hero_router = APIRouter()
 
 
 @hero_router.on_event("startup")
-def on_startup() -> None:
+async def on_startup() -> None:
     # SQLModel.metadata.create_all(get_config().database.engine)
     ...
 
 
 @hero_router.get("/hero/{hero_id}")
-def get_hero(
+async def get_hero(
     *,
     session: Session = Depends(get_session),
     hero_id: int,
@@ -27,7 +27,7 @@ def get_hero(
 
 
 @hero_router.post("/hero/")
-def post_hero(
+async def post_hero(
     *,
     session: Session = Depends(get_session),
     hero: HeroCreate,
@@ -42,7 +42,7 @@ def post_hero(
 
 
 @hero_router.patch("/hero/")
-def patch_hero(
+async def patch_hero(
     *,
     session: Session = Depends(get_session),
     hero: HeroUpdate,
@@ -61,7 +61,7 @@ def patch_hero(
 
 
 @hero_router.delete("/hero/{hero_id}")
-def delete_hero(
+async def delete_hero(
     *,
     session: Session = Depends(get_session),
     hero_id: int,
@@ -77,11 +77,11 @@ def delete_hero(
 
 
 @hero_router.get("/heros/")
-def get_heros(
+async def get_heros(
     *,
     session: Session = Depends(get_session),
 ) -> Heros:
     "get all heros"
     statement = select(Hero)
-    heros = session.exec(statement).all()
+    heros = session.execute(statement).all()
     return Heros(__root__=heros)
diff --git a/learn_sql_model/cli/api.py b/learn_sql_model/cli/api.py
index 2dadd71..aca3703 100644
--- a/learn_sql_model/cli/api.py
+++ b/learn_sql_model/cli/api.py
@@ -29,6 +29,8 @@ def run(
         help="show the log messages",
     ),
 ):
+    import uvicorn
+
     uvicorn.run(**get_config().api_server.dict())
 
 
diff --git a/learn_sql_model/cli/hero.py b/learn_sql_model/cli/hero.py
index c855adc..40366ab 100644
--- a/learn_sql_model/cli/hero.py
+++ b/learn_sql_model/cli/hero.py
@@ -54,7 +54,7 @@ def list() -> Union[Hero, List[Hero]]:
 def clear() -> Union[Hero, List[Hero]]:
     "list many heros"
     heros = Heros.list()
-    for hero in heros.heros:
+    for hero in heros.__root__:
         HeroDelete.delete(id=hero.id)
     return hero
 
diff --git a/learn_sql_model/config.py b/learn_sql_model/config.py
index 4e9415a..07a7b4a 100644
--- a/learn_sql_model/config.py
+++ b/learn_sql_model/config.py
@@ -4,6 +4,7 @@ from typing import TYPE_CHECKING
 from fastapi import Depends
 from pydantic import BaseModel, BaseSettings, validator
 from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
 from sqlmodel import Session
 
 from learn_sql_model.standard_config import load
@@ -18,6 +19,7 @@ class ApiServer(BaseModel):
     reload: bool = True
     log_level: str = "info"
     host: str = "0.0.0.0"
+    workers: int = 1
 
 
 class ApiClient(BaseModel):
@@ -42,7 +44,16 @@ class Database:
 
     @property
     def engine(self) -> "Engine":
-        return create_engine(self.config.database_url)
+        try:
+            return self._engine
+        except AttributeError:
+            self._engine = create_engine(
+                self.config.database_url,
+                connect_args={"check_same_thread": False},
+                pool_recycle=3600,
+                pool_pre_ping=True,
+            )
+            return self._engine
 
     @property
     def session(self) -> "Session":
@@ -87,11 +98,20 @@ def get_config(overrides: dict = {}) -> Config:
     return config
 
 
+config = get_config()
+engine = create_engine(
+    config.database_url,
+    connect_args={"check_same_thread": False},
+    pool_recycle=3600,
+    pool_pre_ping=True,
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
 def get_session() -> "Session":
-    config = get_config()
-    engine = create_engine(config.database_url)
     with Session(engine) as session:
-        yield session
+        yield SessionLocal()
 
 
 async def reset_db_state(config: Config = None) -> None:
diff --git a/learn_sql_model/models/hero.py b/learn_sql_model/models/hero.py
index 93d1dac..67a19c0 100644
--- a/learn_sql_model/models/hero.py
+++ b/learn_sql_model/models/hero.py
@@ -1,13 +1,11 @@
-from typing import Dict, Optional
+from typing import Dict
 
 import httpx
 from pydantic import BaseModel
 from sqlmodel import Field, SQLModel
 
 from learn_sql_model.config import config
-
 from learn_sql_model.optional import optional
-from learn_sql_model.models.pet import Pet
 
 
 class HeroBase(SQLModel, table=False):
@@ -75,7 +73,7 @@ class HeroUpdate(HeroBase):
     def update(self) -> Hero:
         r = httpx.patch(
             f"{config.api_client.url}/hero/",
-            json=self.dict(),
+            json=self.dict(exclude_none=True),
         )
         if r.status_code != 200:
             raise RuntimeError(f"{r.status_code}:\n {r.text}")
diff --git a/migrations/versions/3555f61aaa79_add_x_and_y.py b/migrations/versions/3555f61aaa79_add_x_and_y.py
index 0ff42c5..b6f112d 100644
--- a/migrations/versions/3555f61aaa79_add_x_and_y.py
+++ b/migrations/versions/3555f61aaa79_add_x_and_y.py
@@ -7,30 +7,26 @@ Create Date: 2023-06-22 15:03:27.338959
 """
 from alembic import op
 import sqlalchemy as sa
-import sqlmodel
-from learn_sql_model.er_diagram import generate_er_diagram, generate_er_markdown
-from learn_sql_model.config import get_config
-
 
 
 # revision identifiers, used by Alembic.
-revision = '3555f61aaa79'
-down_revision = '79972ec5f79d'
+revision = "3555f61aaa79"
+down_revision = "79972ec5f79d"
 branch_labels = None
 depends_on = None
 
 
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('hero', sa.Column('x', sa.Integer(), nullable=False))
-    op.add_column('hero', sa.Column('y', sa.Integer(), nullable=False))
+    op.add_column("hero", sa.Column("x", sa.Integer(), nullable=False))
+    op.add_column("hero", sa.Column("y", sa.Integer(), nullable=False))
     # ### end Alembic commands ###
-    generate_er_diagram(f'migrations/versions/{revision}_er_diagram.png')
-    generate_er_markdown(f'migrations/versions/{revision}_er_diagram.md', f'migrations/versions/er_diagram_{revision}.png')
+    # generate_er_diagram(f'migrations/versions/{revision}_er_diagram.png')
+    # generate_er_markdown(f'migrations/versions/{revision}_er_diagram.md', f'migrations/versions/er_diagram_{revision}.png')
 
 
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_column('hero', 'y')
-    op.drop_column('hero', 'x')
+    op.drop_column("hero", "y")
+    op.drop_column("hero", "x")
     # ### end Alembic commands ###
diff --git a/migrations/versions/79972ec5f79d_int.py b/migrations/versions/79972ec5f79d_int.py
index 5fd59b7..1ccca25 100644
--- a/migrations/versions/79972ec5f79d_int.py
+++ b/migrations/versions/79972ec5f79d_int.py
@@ -1,20 +1,17 @@
 """int
 
 Revision ID: 79972ec5f79d
-Revises: 
+Revises:
 Create Date: 2023-06-22 15:02:20.292322
 
 """
 from alembic import op
 import sqlalchemy as sa
 import sqlmodel
-from learn_sql_model.er_diagram import generate_er_diagram, generate_er_markdown
-from learn_sql_model.config import get_config
-
 
 
 # revision identifiers, used by Alembic.
-revision = '79972ec5f79d'
+revision = "79972ec5f79d"
 down_revision = None
 branch_labels = None
 depends_on = None
@@ -22,25 +19,27 @@ depends_on = None
 
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.create_table('hero',
-    sa.Column('name', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
-    sa.Column('secret_name', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
-    sa.Column('id', sa.Integer(), nullable=False),
-    sa.PrimaryKeyConstraint('id')
+    op.create_table(
+        "hero",
+        sa.Column("name", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("secret_name", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
     )
-    op.create_table('pet',
-    sa.Column('name', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
-    sa.Column('birthday', sa.DateTime(), nullable=True),
-    sa.Column('id', sa.Integer(), nullable=False),
-    sa.PrimaryKeyConstraint('id')
+    op.create_table(
+        "pet",
+        sa.Column("name", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("birthday", sa.DateTime(), nullable=True),
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
     )
     # ### end Alembic commands ###
-    generate_er_diagram(f'migrations/versions/{revision}_er_diagram.png')
-    generate_er_markdown(f'migrations/versions/{revision}_er_diagram.md', f'migrations/versions/er_diagram_{revision}.png')
+    # generate_er_diagram(f'migrations/versions/{revision}_er_diagram.png')
+    # generate_er_markdown(f'migrations/versions/{revision}_er_diagram.md', f'migrations/versions/er_diagram_{revision}.png')
 
 
 def downgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('pet')
-    op.drop_table('hero')
+    op.drop_table("pet")
+    op.drop_table("hero")
     # ### end Alembic commands ###