updates

src/transcription/app.py

@@ -20,8 +20,10 @@ from .config import Settings
 from .config import configure_logging
 from .config import get_settings
 from .db import create_all
-from .db import dispose_database_runtime
 from .db import initialize_database_runtime
+from .db.engine import get_database_url
+from .db.engine import resolve_engine
+from .db.session import dispose_session_factory
 from .services import ServiceBundle
 from .services.jobs import JobService
 from .ui import register_pages
@@ -40,7 +42,7 @@ async def _lifespan(app: FastAPI):
     app.state.runtime = initialize_database_runtime(settings=settings)
 
     if settings.should_bootstrap_schema:
-        await create_all(engine=app.state.runtime.engine)
+        await create_all(engine=resolve_engine(settings=settings))
 
     settings.upload_dir.mkdir(parents=True, exist_ok=True)
     settings.prompt_dir.mkdir(parents=True, exist_ok=True)
@@ -48,7 +50,10 @@ async def _lifespan(app: FastAPI):
     await _recover_stale_processing_jobs(app)
 
     async with AsyncExitStack() as stack:
-        stack.push_async_callback(dispose_database_runtime)
+        stack.push_async_callback(
+            dispose_session_factory,
+            database_url=get_database_url(settings),
+        )
         stop_event, worker_notifier = await stack.enter_async_context(
             worker_consumer_lifespan(
                 session_factory=app.state.runtime.session_factory,

src/transcription/app_state.py

@@ -7,7 +7,7 @@ from sqlalchemy.ext.asyncio import async_sessionmaker
 from sqlmodel.ext.asyncio.session import AsyncSession
 
 from transcription.db.runtime import DatabaseRuntime
-from transcription.db.runtime import get_session_factory
+from transcription.db.session import get_session_factory
 from transcription.worker import WorkerNotifier
 from transcription.worker import resolve_worker_notifier
 

src/transcription/config.py

@@ -9,12 +9,14 @@ import logging.config
 from enum import StrEnum
 from functools import cache
 from pathlib import Path
+from typing import Annotated
 from typing import Any
 from typing import Literal
 
+from pydantic import BaseModel
 from pydantic import Field
+from pydantic import SecretStr
 from pydantic_settings import BaseSettings
-from pydantic_settings import CliImplicitFlag
 from pydantic_settings import SettingsConfigDict
 
 logger = logging.getLogger(__name__)
@@ -24,19 +26,41 @@ class Provider(StrEnum):
     OPENROUTER = "openrouter"
 
 
+class SqliteSettings(BaseModel):
+    driver: Literal["sqlite"] = "sqlite"
+    path: str = "app.db"
+
+
+class PostgresSettings(BaseModel):
+    driver: Literal["postgres"] = "postgres"
+    host: str
+    port: int = 5432
+    database: str
+    user: str
+    password: SecretStr
+
+
+DatabaseSettings = Annotated[
+    SqliteSettings | PostgresSettings,
+    Field(discriminator="driver"),
+]
+
+
 class Settings(BaseSettings):
     model_config = SettingsConfigDict(
         env_file=".env",
         env_file_encoding="utf-8",
         extra="ignore",
         cli_parse_args=True,
+        cli_implicit_flags=True,
+        cli_kebab_case=True,
     )
 
     # --- NiceGUI Server ---
     host: str = "0.0.0.0"
     port: int = 8000
     log_level: Literal["critical", "error", "warning", "info", "debug", "trace"] = "info"
-    reload: CliImplicitFlag[bool] = False
+    reload: bool = False
 
     # --- AI provider ---
     provider: Provider = Provider.OPENROUTER
@@ -49,8 +73,9 @@ class Settings(BaseSettings):
     environment: Literal["development", "test", "production"] = "development"
 
     # --- persistence ---
+    database: DatabaseSettings = Field(default_factory=SqliteSettings)
     database_url: str = "sqlite:///./transcription.db"
-    bootstrap_schema_on_startup: bool | None = None
+    bootstrap_schema_on_startup: bool = False
     sqlite_check_same_thread: bool = False
 
     # --- filesystem paths ---

src/transcription/db/__init__.py

@@ -1,6 +1,13 @@
 from .operations import create_all
 from .runtime import dispose_database_runtime
-from .runtime import get_session
 from .runtime import initialize_database_runtime
+from .session import session_scope
+from .session import transaction_scope
 
-__all__ = ["create_all", "dispose_database_runtime", "get_session", "initialize_database_runtime"]
+__all__ = [
+    "create_all",
+    "dispose_database_runtime",
+    "initialize_database_runtime",
+    "session_scope",
+    "transaction_scope",
+]

src/transcription/db/operations.py

@@ -10,13 +10,25 @@ from sqlmodel import SQLModel
 from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
 
+from .engine import resolve_engine
 from .models import Job
 from .models import JobStatus
-from .runtime import get_engine
 
 logger = logging.getLogger(__name__)
 
 
+async def create_all(*, engine: AsyncEngine | None = None) -> None:
+    """Create all tables on the selected engine."""
+    # Import models so SQLModel metadata is fully registered before bootstrap.
+    from transcription.db import models as _models  # noqa: F401
+
+    active_engine = engine or resolve_engine()
+    async with active_engine.begin() as connection:
+        await connection.run_sync(SQLModel.metadata.create_all)
+        await connection.run_sync(_ensure_sqlite_compat_columns)
+    logger.debug("Database schema bootstrap complete for database_url=%s", active_engine.url)
+
+
 async def get_next_queued_job(*, session: AsyncSession) -> Job | None:
     """Get the next queued job, if any."""
     result = await session.exec(
@@ -28,18 +40,6 @@ async def get_next_queued_job(*, session: AsyncSession) -> Job | None:
     return result.first()
 
 
-async def create_all(*, engine: AsyncEngine | None = None) -> None:
-    """Create all tables on the selected engine."""
-    # Import models so SQLModel metadata is fully registered before bootstrap.
-    from transcription.db import models as _models  # noqa: F401
-
-    active_engine = engine or get_engine()
-    async with active_engine.begin() as connection:
-        await connection.run_sync(SQLModel.metadata.create_all)
-        await connection.run_sync(_ensure_sqlite_compat_columns)
-    logger.debug("Database schema bootstrap complete for database_url=%s", active_engine.url)
-
-
 def _ensure_sqlite_compat_columns(connection: Connection) -> None:
     """Apply lightweight dev/test SQLite compatibility column patches.
 

src/transcription/db/runtime.py

@@ -1,18 +1,16 @@
 import logging
-from collections.abc import AsyncGenerator
-from contextlib import asynccontextmanager
 from contextvars import ContextVar
 from dataclasses import dataclass
-from functools import partial
 
 from sqlalchemy.ext.asyncio import AsyncEngine
 from sqlalchemy.ext.asyncio import async_sessionmaker
-from sqlalchemy.ext.asyncio import create_async_engine
 from sqlmodel.ext.asyncio.session import AsyncSession
-from sqlmodel.pool import StaticPool
 
 from ..config import Settings
 from ..config import get_settings
+from .engine import get_database_url
+from .engine import get_engine
+from .session import get_session_factory
 
 logger = logging.getLogger(__name__)
 
@@ -37,33 +35,6 @@ async def dispose_database_runtime() -> None:
     _runtime.set(None)
 
 
-def _to_async_database_url(database_url: str) -> str:
-    """Normalize configured database URL to an async SQLAlchemy driver URL."""
-    if database_url.startswith("sqlite://") and not database_url.startswith("sqlite+aiosqlite://"):
-        return database_url.replace("sqlite://", "sqlite+aiosqlite://", 1)
-    if database_url.startswith("postgresql://") and not database_url.startswith("postgresql+asyncpg://"):
-        return database_url.replace("postgresql://", "postgresql+asyncpg://", 1)
-    return database_url
-
-
-def _build_engine(settings: Settings) -> AsyncEngine:
-    database_url = _to_async_database_url(settings.database_url)
-    engine_factory = partial(
-        create_async_engine,
-        url=database_url,
-        echo=False,
-        pool_pre_ping=True,
-    )
-
-    if database_url.startswith("sqlite"):
-        sqlite_connect_settings = {"check_same_thread": settings.sqlite_check_same_thread}
-        engine_factory = partial(engine_factory, connect_args=sqlite_connect_settings)
-        if ":memory:" in database_url:
-            engine_factory = partial(engine_factory, poolclass=StaticPool)
-
-    return engine_factory()
-
-
 def initialize_database_runtime(*, settings: Settings | None = None) -> DatabaseRuntime:
     """Initialize lifespan-owned async DB resources once per process."""
     runtime = _runtime.get()
@@ -71,33 +42,10 @@ def initialize_database_runtime(*, settings: Settings | None = None) -> Database
         return runtime
 
     active_settings = settings or get_settings()
-    engine = _build_engine(active_settings)
-    session_factory = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+    database_url = get_database_url(active_settings)
+    engine = get_engine(database_url)
+    session_factory = get_session_factory(database_url)
     runtime = DatabaseRuntime(engine=engine, session_factory=session_factory)
     _runtime.set(runtime)
     logger.debug("Initialized async database runtime for database_url=%s", engine.url)
     return runtime
-
-
-def get_engine(settings: Settings | None = None) -> AsyncEngine:
-    """Return the current async SQLAlchemy engine."""
-    runtime = _runtime.get() or initialize_database_runtime(settings=settings)
-    return runtime.engine
-
-
-def get_session_factory(settings: Settings | None = None) -> async_sessionmaker[AsyncSession]:
-    """Return the shared async session factory."""
-    runtime = _runtime.get() or initialize_database_runtime(settings=settings)
-    return runtime.session_factory
-
-
-@asynccontextmanager
-async def get_session(
-    *,
-    settings: Settings | None = None,
-    session_factory: async_sessionmaker[AsyncSession] | None = None,
-) -> AsyncGenerator[AsyncSession]:
-    """Yield a database session and ensure cleanup."""
-    active_session_factory = session_factory or get_session_factory(settings)
-    async with active_session_factory() as session:
-        yield session

src/transcription/services/base.py

@@ -8,7 +8,8 @@ from sqlmodel.ext.asyncio.session import AsyncSession
 
 from ..config import Settings
 from ..config import get_settings
-from ..db.runtime import get_session_factory
+from ..db.session import resolve_session_factory
+from ..db.session import session_scope
 
 
 class ServiceBase(ABC):
@@ -24,19 +25,14 @@ class ServiceBase(ABC):
         queue: asyncio.Queue | None = None,
     ):
         self.settings = get_settings()
-        self.session_factory = session_factory or get_session_factory()
+        self.session_factory = session_factory or resolve_session_factory()
         self.queue = queue or asyncio.Queue()
 
     @asynccontextmanager
     async def _session_scope(self, session: AsyncSession | None = None):
         """Provide a transactional scope around a series of operations."""
-        if session is not None:
-            # Reuse the provided session if one is passed in
-            yield session
-        else:
-            # Otherwise, create a new session for this scope
-            async with self.session_factory() as new_session:
-                yield new_session
+        async with session_scope(session=session) as active_session:
+            yield active_session
 
     async def _finalize(
         self,

src/transcription/ui/pages/jobs_page.py

@@ -4,10 +4,8 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from fastapi import Request
 from nicegui import ui
 
-from transcription.app_state import resolve_session_factory
 from transcription.db.models import Job
 from transcription.db.models import JobStatus
 from transcription.db.models import Source
@@ -17,6 +15,7 @@ from transcription.ui.components.app_shell import render_navigation_header
 from transcription.ui.components.error_presenter import show_error
 from transcription.ui.components.table.jobs import render_jobs_table
 
+from ...db.session import SessionFactoryDep
 from ..components.document_panzoom import render_document_panzoom
 from ..components.table.jobs import JobTableRow
 from ..components.transcript import render_original_transcription_card
@@ -27,8 +26,7 @@ def register_page() -> None:  # noqa: PLR0915
     """Register jobs list and detail routes."""
 
     @ui.page("/jobs")
-    async def jobs_page(request: Request) -> None:
-        session_factory = resolve_session_factory(request.app.state)
+    async def jobs_page(session_factory: SessionFactoryDep) -> None:
         jobs_service = JobService(session_factory=session_factory)
         render_navigation_header(current_path="/jobs")
 
@@ -51,8 +49,7 @@ def register_page() -> None:  # noqa: PLR0915
         await render_table()
 
     @ui.page("/jobs/{job_id}")
-    async def job_detail_page(job_id: str, request: Request) -> None:  # noqa: PLR0915
-        session_factory = resolve_session_factory(request.app.state)
+    async def job_detail_page(job_id: str, session_factory: SessionFactoryDep) -> None:  # noqa: PLR0915
         jobs_service = JobService(session_factory=session_factory)
         transcription_service = TranscriptionService(session_factory=session_factory)
         render_navigation_header(current_path="/jobs")

src/transcription/ui/pages/upload_page.py

@@ -5,8 +5,7 @@ from __future__ import annotations
 from fastapi import Request
 from nicegui import ui
 
-from transcription.app_state import resolve_session_factory
-from transcription.db import get_session
+from transcription.db import session_scope
 from transcription.services.store import create_upload_job
 from transcription.ui.components.app_shell import render_navigation_header
 from transcription.ui.components.upload import render_upload_widget
@@ -19,10 +18,9 @@ def register_page() -> None:
     @ui.page("/upload", title="Upload Document")
     def upload_page(request: Request) -> None:
         render_navigation_header(current_path="/upload")
-        session_factory = resolve_session_factory(request.app.state)
 
         async def submit_upload(filename: str, file_bytes: bytes):
-            async with get_session(session_factory=session_factory) as session:
+            async with session_scope() as session:
                 return await create_upload_job(
                     filename=filename,
                     file_bytes=file_bytes,

src/transcription/worker.py

@@ -14,7 +14,7 @@ from uuid import UUID
 from sqlalchemy.ext.asyncio import async_sessionmaker
 from sqlmodel.ext.asyncio.session import AsyncSession
 
-from transcription.db import get_session
+from transcription.db import session_scope
 from transcription.errors import AppError
 from transcription.errors import classify_unexpected_error
 
@@ -178,7 +178,7 @@ async def process_next_queued_job(
         )
 
     if session is None:
-        async with get_session(session_factory=session_factory) as local_session:
+        async with session_scope(session_factory=session_factory) as local_session:
             return await process_next_queued_job_workflow(services=services, session=local_session)
 
     return await process_next_queued_job_workflow(services=services, session=session)