8 files changed, 220 insertions, 0 deletions

diff --git a/db/__init__.py b/db/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/db/__init__.py
diff --git a/db/migrations/README b/db/migrations/README
new file mode 100644
index 0000000..98e4f9c
--- /dev/null
+++ b/db/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/db/migrations/env.py b/db/migrations/env.py
new file mode 100644
index 0000000..f1b3156
--- /dev/null
+++ b/db/migrations/env.py
@@ -0,0 +1,82 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+from conf import DATABASE_URL
+from db.models import *
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = SQLModel.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+config.set_main_option('sqlalchemy.url', DATABASE_URL)
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/db/migrations/script.py.mako b/db/migrations/script.py.mako
new file mode 100644
index 0000000..697cf67
--- /dev/null
+++ b/db/migrations/script.py.mako
@@ -0,0 +1,29 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}
diff --git a/db/migrations/versions/202607012255-40e20fbf63c9_.py b/db/migrations/versions/202607012255-40e20fbf63c9_.py
new file mode 100644
index 0000000..a32131a
--- /dev/null
+++ b/db/migrations/versions/202607012255-40e20fbf63c9_.py
@@ -0,0 +1,35 @@
+"""empty message
+
+Revision ID: 40e20fbf63c9
+Revises: 6ebaa6ab0f48
+Create Date: 2026-07-01 22:55:55.017591
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+
+
+# revision identifiers, used by Alembic.
+revision: str = '40e20fbf63c9'
+down_revision: Union[str, Sequence[str], None] = '6ebaa6ab0f48'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user', sa.Column('external_id', sa.Uuid(), nullable=False, server_default=sa.text('gen_random_uuid()')))
+    op.create_index(op.f('ix_user_external_id'), 'user', ['external_id'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_user_external_id'), table_name='user')
+    op.drop_column('user', 'external_id')
+    # ### end Alembic commands ###
diff --git a/db/migrations/versions/202607012255-6ebaa6ab0f48_.py b/db/migrations/versions/202607012255-6ebaa6ab0f48_.py
new file mode 100644
index 0000000..9d4daa2
--- /dev/null
+++ b/db/migrations/versions/202607012255-6ebaa6ab0f48_.py
@@ -0,0 +1,39 @@
+"""empty message
+
+Revision ID: 6ebaa6ab0f48
+Revises: 
+Create Date: 2026-07-01 22:55:14.146711
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+
+
+# revision identifiers, used by Alembic.
+revision: str = '6ebaa6ab0f48'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('user',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('username', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_username'), 'user', ['username'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_user_username'), table_name='user')
+    op.drop_table('user')
+    # ### end Alembic commands ###
diff --git a/db/models.py b/db/models.py
new file mode 100644
index 0000000..b66f5bc
--- /dev/null
+++ b/db/models.py
@@ -0,0 +1,13 @@
+from uuid import uuid4, UUID
+
+from sqlmodel import SQLModel, Field
+
+
+class BaseModel(SQLModel):
+    id: int | None = Field(primary_key=True, default=None)
+
+class ExternalModelMixin:
+    external_id: UUID = Field(index=True, unique=True, default_factory=uuid4)
+
+class User(BaseModel, ExternalModelMixin, table=True):
+    username: str = Field(unique=True, index=True)
diff --git a/db/session.py b/db/session.py
new file mode 100644
index 0000000..4d83649
--- /dev/null
+++ b/db/session.py
@@ -0,0 +1,21 @@
+from contextlib import contextmanager
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, scoped_session
+from sqlmodel import Session
+
+from conf import DATABASE_URL
+from utils.json import json_serializer
+
+
+engine = create_engine(DATABASE_URL, echo=True, future=True, json_serializer=json_serializer, pool_size=100, pool_recycle=3600)
+session_factory = sessionmaker(engine, class_=Session)
+ScopedSession = scoped_session(session_factory=session_factory)
+
+def get_session():
+    with ScopedSession() as session:
+        yield session
+
+@contextmanager