fix(api): lifespan param named _app without dishka

README.md

@@ -1,10 +1,6 @@
 # backend-python
 
-Copier template for a Python backend, either as a `backend/` part next to other parts or alone at the root of the project (`layout`): a uv project with one Docker image and one `python -m <module>` entrypoint per service (`api`, `bot`, `userbot`, `worker`, `scheduler`), pydantic-settings, rich logging, optional Dishka, MongoDB or PostgreSQL, Redis, taskiq (in-memory, Redis or PostgreSQL broker), CryptoPay, pydantic-ai and a DynamicConfig stored in the database.
+Copier template for a Python backend: a uv project, one Docker image, a `python -m <module>` entrypoint per service (`api`, `bot`, `userbot`, `worker`, `scheduler`), optional Dishka, MongoDB or PostgreSQL, Redis, taskiq, CryptoPay, pydantic-ai and a dynamic config in the database. A `backend/` part or the whole project (`layout`), on top of `infra`.
-
-Ships `backend/docker-compose.yml` with root-relative paths and profiles per service, `docker-compose.override.yml.example` (published ports and the `caddy` network aliases, copied by `make env`), a `Makefile` with `fmt`, `check` (ruff, ty and `scripts/check_imports.py`, which keeps each service from importing the others' SDKs at startup), `build` and service-specific targets, `.env.example` and `CLAUDE.md`. Applied on top of the `infra` template, `layout: parts` or `layout: single` respectively.
-
-`DB__HOST`/`DB__PORT` and `REDIS__HOST`/`REDIS__PORT` say where the service really is. The bundled container takes the host as its network alias and listens on the port, the override publishes it on the machine. For an external database, point them at it and leave its profile out of `COMPOSE_PROFILES`.
 
 ```sh
 copier copy --trust -d project_name="My Thing" <this-repo> <dest>

copier.yml

@@ -71,7 +71,7 @@ taskiq_broker:
   choices:
     in-memory: memory
     Redis: redis
-    PostgreSQL (taskiq-pg):
+    PostgreSQL (taskiq-postgres):
       value: postgres
       validator: "{% if database != 'postgres' %}Requires the PostgreSQL database{% endif %}"
   default: memory

template/{{ part_dir }}/.env.example.jinja

@@ -1,7 +1,7 @@
 {%- set groups = [] -%}
 {%- if layout == 'root' %}{% set _ = groups.append(["COMPOSE_PROFILES=" ~ ("external," if database != 'none' or use_redis else "") ~ "services"]) %}{% endif -%}
 {%- set _ = groups.append(["RUN_ENVIRONMENT=prod", "TZ=UTC"]) -%}
-{%- set _ = groups.append(["LOG__LEVEL=INFO", "LOG__LEVEL_EXTERNAL=WARNING", "LOG__SHOW_TIME=false", "LOG__CONSOLE_WIDTH=150"]) -%}
+{%- set _ = groups.append(["LOG__LEVEL=INFO", "LOG__LEVEL_EXTERNAL=WARNING", "LOG__SHOW_TIME=false", "LOG__SHOW_LOCALS=false", "LOG__CONSOLE_WIDTH=150"]) -%}
 {%- if database == 'mongo' %}{% set _ = groups.append(["DB__HOST=mongodb", "DB__PORT=27017", "DB__USER=" ~ project_slug, "DB__PASSWORD=" ~ project_slug, "DB__DB_NAME=" ~ project_slug, "DB__SCRIPTS_CONNECTION_URL=mongodb://" ~ project_slug ~ ":" ~ project_slug ~ "@localhost:27017/" ~ project_slug ~ "?authSource=admin"]) %}{% endif -%}
 {%- if database == 'postgres' %}{% set _ = groups.append(["DB__HOST=postgres", "DB__PORT=5432", "DB__USER=" ~ project_slug, "DB__PASSWORD=" ~ project_slug, "DB__DB_NAME=" ~ project_slug, "DB__SCRIPTS_CONNECTION_URL=postgresql://" ~ project_slug ~ ":" ~ project_slug ~ "@localhost:5432/" ~ project_slug]) %}{% endif -%}
 {%- if use_redis %}{% set _ = groups.append(["REDIS__HOST=redis", "REDIS__PORT=6379", "REDIS__CACHE_TTL=300", "REDIS__SCRIPTS_CONNECTION_URL=redis://localhost:6379/0"]) %}{% endif -%}

template/{{ part_dir }}/Dockerfile.jinja

@@ -5,7 +5,7 @@
 {%- if 'kurigram_userbot' in backend_services %}{% set _ = svc_modules.append("userbot") %}{% endif -%}
 {%- if 'scheduler' in backend_services and 'taskiq_worker' not in backend_services %}{% set _ = svc_modules.append("scheduler") %}{% endif -%}
 {%- if 'kurigram_userbot' in backend_services -%}
-FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim
+FROM ghcr.io/astral-sh/uv:python3.13-trixie-slim
 
 RUN apt-get update && apt-get install -y build-essential && rm -rf /var/lib/apt/lists/*
 {%- else -%}

template/{{ part_dir }}/Makefile.jinja

@@ -4,23 +4,10 @@
 {%- if 'taskiq_worker' in backend_services %}{% set _ = svc_modules.append("worker") %}{% endif -%}
 {%- if 'kurigram_userbot' in backend_services %}{% set _ = svc_modules.append("userbot") %}{% endif -%}
 {%- if 'scheduler' in backend_services and 'taskiq_worker' not in backend_services %}{% set _ = svc_modules.append("scheduler") %}{% endif -%}
-{%- set app_services = [] -%}
-{%- if 'api' in backend_services %}{% set _ = app_services.append("api") %}{% endif -%}
-{%- if 'aiogram_bot' in backend_services %}{% set _ = app_services.append("bot") %}{% endif -%}
-{%- if 'taskiq_worker' in backend_services %}{% set _ = app_services.append("worker") %}{% endif -%}
-{%- if 'kurigram_userbot' in backend_services %}{% set _ = app_services.append("userbot") %}{% endif -%}
-{%- if 'scheduler' in backend_services %}{% set _ = app_services.append("scheduler") %}{% endif -%}
 {%- set has_script = dynamic_config and svc_modules -%}
-{%- set has_scripts = dynamic_config or 'kurigram_userbot' in backend_services -%}
 COMPOSE := {% if layout == 'part' %}cd .. && {% endif %}docker compose
-{% if svc_modules %}IMAGE := {{ project_slug }}/backend
+
-IMAGE_INPUTS := pyproject.toml uv.lock Dockerfile
+.PHONY: {% if layout == 'root' %}env recreate rebuild restart logs down {% endif %}fmt check{% if svc_modules %} build{% endif %}{% if database == 'postgres' %} migrate revision{% endif %}{% if has_script %} script{% endif %}{% if 'kurigram_userbot' in backend_services %} session{% endif %}
-CODE := src{% if has_scripts %} scripts{% endif %}{% if serve_spa %} ../frontend{% endif %}
-SERVICES := {{ app_services | join(' ') }}
-changed = ! git diff --quiet $(1) -- $(2) 2>/dev/null
-stamp = { git update-ref $(1) HEAD 2>/dev/null || true; }
-{% endif %}
-.PHONY: {% if layout == 'root' %}env recreate rebuild restart logs down deploy {% endif %}fmt check{% if svc_modules %} build pre-deploy post-deploy{% endif %}{% if database == 'postgres' %} migrate revision{% endif %}{% if has_script %} script{% endif %}{% if 'kurigram_userbot' in backend_services %} session{% endif %}
 
 fmt:
 	uv run ruff format
@@ -34,20 +21,6 @@ check:
 {% endif %}{% if svc_modules %}
 build:
 	$(COMPOSE) build {{ svc_modules[0] }}
-
-pre-deploy:
-	@if $(call changed,refs/deploy/backend,$(IMAGE_INPUTS)) || ! docker image inspect $(IMAGE) >/dev/null 2>&1; then \
-		$(MAKE) build && $(call stamp,refs/deploy/backend) && $(call stamp,refs/deploy/backend-code); \
-	fi
-{% if database == 'postgres' %}	@$(COMPOSE) config --services | grep -qx postgres && $(COMPOSE) up -d postgres || true
-	$(MAKE) migrate
-{% endif %}
-post-deploy:
-	@if $(call changed,refs/deploy/backend-code,$(CODE)); then \
-		running=$$($(COMPOSE) ps --services --status running | grep -x $(addprefix -e ,$(SERVICES))); \
-		[ -z "$$running" ] || $(COMPOSE) restart $$running; \
-		$(call stamp,refs/deploy/backend-code); \
-	fi
 {% endif %}{% if layout == 'root' %}
 env:
 	@fresh=; test -f .env || { cp .env.example .env; fresh=1; }; \
@@ -74,11 +47,7 @@ logs:
 
 down:
 	$(COMPOSE) down
-{% if svc_modules %}
+{% endif %}{% if database == 'postgres' %}
-deploy: pre-deploy
-	$(COMPOSE) up -d
-	$(MAKE) post-deploy
-{% endif %}{% endif %}{% if database == 'postgres' %}
 migrate:
 	$(COMPOSE) run --rm migrator $(or $(filter-out $@,$(MAKECMDGOALS)),upgrade head)
 

template/{{ part_dir }}/docker-compose.yml.jinja

@@ -14,7 +14,7 @@
 {%- if 'scheduler' in backend_services %}{% set _ = app_services.append({'name': 'scheduler', 'command': ('[worker, scheduler]' if 'taskiq_worker' in backend_services else '[scheduler]')}) %}{% endif -%}
 {%- macro backend_service(name, command) %}  {{ name }}:
     build: {{ part_dir }}
-    image: {{ project_slug }}/backend
+    image: {{ project_slug | replace('_', '-') }}/backend
     profiles: [{{ name }}, services]
     restart: unless-stopped
     env_file:
@@ -87,7 +87,7 @@ services:
 
   migrator:
     build: {{ part_dir }}
-    image: {{ project_slug }}/backend
+    image: {{ project_slug | replace('_', '-') }}/backend
     profiles: [migrate]
     env_file:
       - path: .env

template/{{ part_dir }}/pyproject.toml.jinja

@@ -4,7 +4,7 @@
 {%- if 'aiogram_bot' in backend_services %}{% set _ = deps.append("aiogram>=3.29.0") %}{% endif -%}
 {%- if include_payments %}{% set _ = deps.append("aiosend>=3.0.7") %}{% endif -%}
 {%- if 'kurigram_userbot' in backend_services %}{% set _ = deps.append("anyio>=4.0.0") %}{% set _ = deps.append("kurigram>=2.2.15") %}{% set _ = deps.append("tgcrypto>=1.2.5") %}{% set _ = deps.append("uvloop>=0.21.0") %}{% endif -%}
-{%- if 'taskiq_worker' in backend_services %}{% set _ = deps.append("taskiq>=0.12.4") %}{% if taskiq_broker == 'redis' %}{% set _ = deps.append("taskiq-redis>=1.2.3") %}{% endif %}{% if taskiq_broker == 'postgres' %}{% set _ = deps.append("taskiq-pg>=0.2.0") %}{% endif %}{% endif -%}
+{%- if 'taskiq_worker' in backend_services %}{% set _ = deps.append("taskiq>=0.13.0") %}{% if taskiq_broker == 'redis' %}{% set _ = deps.append("taskiq-redis>=1.2.3") %}{% endif %}{% if taskiq_broker == 'postgres' %}{% set _ = deps.append("taskiq-postgres[asyncpg]>=0.9.1") %}{% endif %}{% endif -%}
 {%- if 'scheduler' in backend_services %}{% set _ = deps.append("apscheduler>=3.11.0") %}{% endif -%}
 {%- if database == 'mongo' %}{% set _ = deps.append("beanie>=2.0.1") %}{% endif -%}
 {%- if database == 'postgres' %}{% set _ = deps.append("sqlmodel>=0.0.39") %}{% set _ = deps.append("asyncpg>=0.31.0") %}{% set _ = deps.append("alembic>=1.18.5") %}{% set _ = deps.append("greenlet>=3.5.3") %}{% endif -%}
@@ -34,7 +34,7 @@ dependencies = [
 ]
 
 [build-system]
-requires = ["uv_build>=0.12.10,<0.13.0"]
+requires = ["uv_build>=0.13.0,<0.14.0"]
 build-backend = "uv_build"
 
 [tool.uv.build-backend]

template/{{ part_dir }}/scripts/{% if dynamic_config %}config{% endif %}/edit.py.jinja

@@ -261,10 +261,9 @@ async def read_config() -> DynamicConfigBase:
 
 async def write_config(config: DynamicConfigBase) -> DynamicConfigBase:
     await init_db()
-    doc = await DynamicConfig.get_or_create()
+    await DynamicConfig.update_config(
-    for name in DynamicConfigBase.model_fields:
+        **{name: getattr(config, name) for name in DynamicConfigBase.model_fields}
-        setattr(doc, name, getattr(config, name))
+    )
-    await doc.save()
     return config
 
 

template/{{ part_dir }}/src/utils/env.py.jinja

@@ -22,6 +22,7 @@ class LogSettings(Section):
     level: str = "INFO"
     level_external: str = "WARNING"
     show_time: bool = False
+    show_locals: bool = False
     console_width: int = 150
 {% if database == 'mongo' %}
 

template/{{ part_dir }}/src/utils/logging.py.jinja

@@ -28,7 +28,7 @@ def setup_logging() -> None:
                 markup=True,
                 rich_tracebacks=True,
                 enable_link_path=False,
-                tracebacks_show_locals=True,
+                tracebacks_show_locals=env.log.show_locals,
                 omit_repeated_times=False,
                 show_time=env.log.show_time,
                 {%- if 'aiogram_bot' in backend_services %}
@@ -37,7 +37,7 @@ def setup_logging() -> None:
             )
         ],
     )
-    install(console=console, show_locals=True)
+    install(console=console, show_locals=env.log.show_locals)
 
 
 logger = logging.getLogger("{{ project_slug }}")

template/{{ part_dir }}/src/utils/{% if database != 'none' %}db{% endif %}/models/{% if dynamic_config %}config.py{% endif %}.jinja

@@ -22,6 +22,7 @@ class DynamicConfig(SQLModel, table=True):
 
     id: int = SQLField(default=1, primary_key=True)
     data: dict[str, Any] = SQLField(sa_column=Column(postgresql.JSONB, nullable=False))
+    version: int = SQLField(default=0)
     updated_at: datetime | None = SQLField(
         default=None,
         sa_column=Column(
@@ -32,8 +33,19 @@ class DynamicConfig(SQLModel, table=True):
         ),
     )
 {%- else -%}
+import time
+from dataclasses import dataclass
+
 from beanie import Document
+from beanie.odm.operators.update import BaseUpdateOperator
+from beanie.operators import Inc, Set
 from pydantic import BaseModel, Field
+from pymongo.errors import PyMongoError
+
+from utils.logging import logger
+
+CONFIG_CHECK_SECONDS = 5.0
+CONFIG_TTL_SECONDS = 900.0
 
 
 class BotConfig(BaseModel):
@@ -44,15 +56,69 @@ class DynamicConfigBase(BaseModel):
     bot: BotConfig = Field(default_factory=BotConfig)
 
 
+@dataclass
+class _ConfigCache:
+    value: "DynamicConfig | None" = None
+    loaded_at: float = 0.0
+    checked_at: float = 0.0
+
+
+_cache = _ConfigCache()
+
+
 class DynamicConfig(DynamicConfigBase, Document):
+    version: int = 0
+
     class Settings:
         name = "config"
 
     @classmethod
     async def get_or_create(cls) -> "DynamicConfig":
-        config = await cls.find_one()
+        now = time.monotonic()
-        if config is None:
+        current = _cache.value
-            config = cls()
+        if current is None:
-            await config.save()
+            current = await cls._reload()
-        return config
+        elif now - _cache.loaded_at >= CONFIG_TTL_SECONDS:
+            current = await cls._reload_or_keep(current)
+        elif now - _cache.checked_at >= CONFIG_CHECK_SECONDS:
+            _cache.checked_at = now
+            current = await cls._refresh_if_changed(current)
+        return current.model_copy(deep=True)
+
+    @classmethod
+    async def update_config(
+        cls, *operations: BaseUpdateOperator, **sections: BaseModel
+    ) -> "DynamicConfig":
+        current = await cls.get_or_create()
+        changes = [*operations, Set(sections)] if sections else [*operations]
+        await cls.find_one(cls.id == current.id).update(*changes, Inc({cls.version: 1}))
+        return (await cls._reload()).model_copy(deep=True)
+
+    @classmethod
+    async def _reload(cls) -> "DynamicConfig":
+        loaded = await cls.find_one() or await cls().insert()
+        _cache.value = loaded
+        _cache.loaded_at = _cache.checked_at = time.monotonic()
+        return loaded
+
+    @classmethod
+    async def _reload_or_keep(cls, current: "DynamicConfig") -> "DynamicConfig":
+        try:
+            return await cls._reload()
+        except PyMongoError as e:
+            logger.warning(f"Config reload failed, serving the cached copy: {e}")
+            return current
+
+    @classmethod
+    async def _refresh_if_changed(cls, current: "DynamicConfig") -> "DynamicConfig":
+        try:
+            stored = await cls.get_pymongo_collection().find_one(
+                {"_id": current.id}, {"version": 1}
+            )
+        except PyMongoError as e:
+            logger.warning(f"Config version check failed, serving the cached copy: {e}")
+            return current
+        if stored and stored.get("version", 0) == current.version:
+            return current
+        return await cls._reload_or_keep(current)
 {%- endif %}

template/{{ part_dir }}/src/utils/{% if database != 'none' %}db{% endif %}/{% if database == 'postgres' %}repositories{% endif %}/{% if dynamic_config %}config.py{% endif %}.jinja

@@ -1,88 +1,139 @@
-{% if use_redis -%}
+import time
+{%- if use_redis %}
+from contextlib import suppress
+{%- endif %}
+from typing import Any
+
+from pydantic import BaseModel
+{%- if use_redis %}
+from redis.exceptions import RedisError
+{%- endif %}
+from sqlalchemy import literal, update
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.ext.asyncio import async_sessionmaker
+from sqlmodel import col, select
 from sqlmodel.ext.asyncio.session import AsyncSession
 
 from utils.db.models.config import DynamicConfig, DynamicConfigBase
+from utils.logging import logger
+{%- if use_redis %}
 
 from .cache import RedisCache
+{%- endif %}
 
-CONFIG_CACHE_KEY = "config:dynamic"
 CONFIG_ROW_ID = 1
+CONFIG_CHECK_SECONDS = 5.0
+CONFIG_TTL_SECONDS = 900.0
+{%- if use_redis %}
+CONFIG_CACHE_KEY = "config:dynamic"
+{%- endif %}
 
 
 class ConfigRepository:
     def __init__(
-        self, sessionmaker: async_sessionmaker[AsyncSession], cache: RedisCache
+        self, sessionmaker: async_sessionmaker[AsyncSession]{% if use_redis %}, cache: RedisCache{% endif %}
     ) -> None:
         self._sessionmaker = sessionmaker
+{%- if use_redis %}
         self._cache = cache
-
-    async def get(self) -> DynamicConfigBase:
-        return await self._cache.get_or_set_model(
-            CONFIG_CACHE_KEY, DynamicConfigBase, self._load
-        )
-
-    async def _load(self) -> DynamicConfigBase:
-        async with self._sessionmaker() as session:
-            row = await session.get(DynamicConfig, CONFIG_ROW_ID)
-            if row is None:
-                config = DynamicConfigBase()
-                session.add(DynamicConfig(id=CONFIG_ROW_ID, data=config.model_dump()))
-                await session.commit()
-                return config
-            return DynamicConfigBase.model_validate(row.data)
-
-    async def save(self, config: DynamicConfigBase) -> DynamicConfigBase:
-        async with self._sessionmaker() as session:
-            row = await session.get(DynamicConfig, CONFIG_ROW_ID)
-            if row is None:
-                session.add(DynamicConfig(id=CONFIG_ROW_ID, data=config.model_dump()))
-            else:
-                row.data = config.model_dump()
-                session.add(row)
-            await session.commit()
-        await self._cache.set_model(CONFIG_CACHE_KEY, config)
-        return config
-
-    async def reset(self) -> DynamicConfigBase:
-        return await self.save(DynamicConfigBase())
-
-    async def invalidate(self) -> None:
-        await self._cache.invalidate(CONFIG_CACHE_KEY)
-{%- else -%}
-from sqlalchemy.ext.asyncio import async_sessionmaker
-from sqlmodel.ext.asyncio.session import AsyncSession
-
-from utils.db.models.config import DynamicConfig, DynamicConfigBase
-
-CONFIG_ROW_ID = 1
-
-
-class ConfigRepository:
-    def __init__(self, sessionmaker: async_sessionmaker[AsyncSession]) -> None:
-        self._sessionmaker = sessionmaker
-
-    async def get(self) -> DynamicConfigBase:
-        async with self._sessionmaker() as session:
-            row = await session.get(DynamicConfig, CONFIG_ROW_ID)
-            if row is None:
-                config = DynamicConfigBase()
-                session.add(DynamicConfig(id=CONFIG_ROW_ID, data=config.model_dump()))
-                await session.commit()
-                return config
-            return DynamicConfigBase.model_validate(row.data)
-
-    async def save(self, config: DynamicConfigBase) -> DynamicConfigBase:
-        async with self._sessionmaker() as session:
-            row = await session.get(DynamicConfig, CONFIG_ROW_ID)
-            if row is None:
-                session.add(DynamicConfig(id=CONFIG_ROW_ID, data=config.model_dump()))
-            else:
-                row.data = config.model_dump()
-                session.add(row)
-            await session.commit()
-        return config
-
-    async def reset(self) -> DynamicConfigBase:
-        return await self.save(DynamicConfigBase())
 {%- endif %}
+        self._value: DynamicConfigBase | None = None
+        self._version = -1
+        self._loaded_at = 0.0
+        self._checked_at = 0.0
+
+    async def get(self) -> DynamicConfigBase:
+        now = time.monotonic()
+        current = self._value
+        if current is None:
+            current = await self._reload()
+        elif now - self._loaded_at >= CONFIG_TTL_SECONDS:
+            current = await self._reload_or_keep(current)
+        elif now - self._checked_at >= CONFIG_CHECK_SECONDS:
+            self._checked_at = now
+            current = await self._refresh_if_changed(current)
+        return current.model_copy(deep=True)
+
+    async def save(self, config: DynamicConfigBase) -> DynamicConfigBase:
+        return await self._write(config.model_dump(mode="json"), merge=False)
+
+    async def update(self, **sections: BaseModel) -> DynamicConfigBase:
+        patch = {name: value.model_dump(mode="json") for name, value in sections.items()}
+        return await self._write(patch, merge=True)
+
+    async def reset(self) -> DynamicConfigBase:
+        return await self.save(DynamicConfigBase())
+
+    async def _write(self, data: dict[str, Any], *, merge: bool) -> DynamicConfigBase:
+        await self.get()
+        payload = literal(data, JSONB)
+        async with self._sessionmaker() as session:
+            await session.exec(
+                update(DynamicConfig)
+                .where(col(DynamicConfig.id) == CONFIG_ROW_ID)
+                .values(
+                    data=col(DynamicConfig.data).op("||")(payload) if merge else payload,
+                    version=col(DynamicConfig.version) + 1,
+                )
+            )
+            await session.commit()
+        return (await self._reload()).model_copy(deep=True)
+
+    async def _stored_version(self) -> int | None:
+        async with self._sessionmaker() as session:
+            query = select(DynamicConfig.version).where(
+                col(DynamicConfig.id) == CONFIG_ROW_ID
+            )
+            return (await session.exec(query)).first()
+
+    async def _reload(self) -> DynamicConfigBase:
+{%- if use_redis %}
+        version = await self._stored_version()
+        if version is not None:
+            with suppress(RedisError):
+                key = f"{CONFIG_CACHE_KEY}:{version}"
+                cached = await self._cache.get_model(key, DynamicConfigBase)
+                if cached is not None:
+                    return self._remember(cached, version)
+{%- endif %}
+        async with self._sessionmaker() as session:
+            row = await session.get(DynamicConfig, CONFIG_ROW_ID)
+            if row is None:
+                row = DynamicConfig(
+                    id=CONFIG_ROW_ID, data=DynamicConfigBase().model_dump(mode="json")
+                )
+                session.add(row)
+                await session.commit()
+                await session.refresh(row)
+            value = DynamicConfigBase.model_validate(row.data)
+            version = row.version
+{%- if use_redis %}
+        with suppress(RedisError):
+            await self._cache.set_model(f"{CONFIG_CACHE_KEY}:{version}", value)
+{%- endif %}
+        return self._remember(value, version)
+
+    def _remember(self, value: DynamicConfigBase, version: int) -> DynamicConfigBase:
+        self._value, self._version = value, version
+        self._loaded_at = self._checked_at = time.monotonic()
+        return value
+
+    async def _reload_or_keep(self, current: DynamicConfigBase) -> DynamicConfigBase:
+        try:
+            return await self._reload()
+        except SQLAlchemyError as e:
+            logger.warning(f"Config reload failed, serving the cached copy: {e}")
+            return current
+
+    async def _refresh_if_changed(
+        self, current: DynamicConfigBase
+    ) -> DynamicConfigBase:
+        try:
+            version = await self._stored_version()
+        except SQLAlchemyError as e:
+            logger.warning(f"Config version check failed, serving the cached copy: {e}")
+            return current
+        if version == self._version:
+            return current
+        return await self._reload_or_keep(current)

template/{{ part_dir }}/src/{% if 'api' in backend_services %}api{% endif %}/app.py.jinja

@@ -18,7 +18,7 @@ NO_CACHE_HEADERS = {"Cache-Control": "no-cache"}
 {% endif %}
 
 @asynccontextmanager
-async def lifespan(app_: FastAPI) -> AsyncGenerator[None]:
+async def lifespan({% if use_dishka %}app_{% else %}_app{% endif %}: FastAPI) -> AsyncGenerator[None]:
     setup_logging()
     {%- if database != 'none' %}
     await init_db()

template/{{ part_dir }}/src/{% if 'taskiq_worker' in backend_services %}worker{% endif %}/broker.py.jinja

@@ -43,7 +43,7 @@ setup_dishka(container, broker)
 {% if use_dishka %}from dishka.integrations.taskiq import setup_dishka
 {% endif %}{% if 'scheduler' in backend_services %}from taskiq import TaskiqScheduler
 from taskiq.schedule_sources import LabelScheduleSource
-{% endif %}from taskiq_pg import AsyncpgBroker, AsyncpgResultBackend
+{% endif %}from taskiq_pg.asyncpg import AsyncpgBroker, AsyncpgResultBackend
 
 {% if use_dishka %}from dependencies.container import container
 {% endif %}from utils.env import env

template/{{ part_dir }}/{% if database == 'postgres' %}migrations{% endif %}/env.py

@@ -16,10 +16,15 @@ if config.config_file_name is not None:
 target_metadata = SQLModel.metadata
 
 
+def include_name(name: str | None, type_: str, _parents: object) -> bool:
+    return not (type_ == "table" and name is not None and name.startswith("taskiq_"))
+
+
 def run_migrations_offline() -> None:
     context.configure(
         url=env.db.connection_url,
         target_metadata=target_metadata,
+        include_name=include_name,
         literal_binds=True,
         dialect_opts={"paramstyle": "named"},
     )
@@ -28,7 +33,11 @@ def run_migrations_offline() -> None:
 
 
 def do_run_migrations(connection: Connection) -> None:
-    context.configure(connection=connection, target_metadata=target_metadata)
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        include_name=include_name,
+    )
     with context.begin_transaction():
         context.run_migrations()
 

template/{{ part_dir }}/{% if layout == 'part' %}CLAUDE.md{% endif %}

@@ -1,13 +0,0 @@
-## Checking commands
-After writing code, always run from `backend/`:
-```shell
-ruff format
-ruff check --fix
-ty check
-```
-
-## Imports
-Every service imports only what it needs to start. `make check` runs `scripts/check_imports.py`, which fails when a service loads a heavy package it is not allowed; `SERVICES` there is the contract, extend it on purpose.
-- Package `__init__` files don't re-export clients or SDKs.
-- An SDK used by one function is imported inside it. On an async path load it first with `await preload("<module>")` from `utils.imports`, so the event loop never waits on the import.
-- Types used in Dishka provider signatures and `FromDishka[...]` stay real top-level imports.

template/{{ part_dir }}/{% if layout == 'part' %}CLAUDE.md{% endif %}.jinja

@@ -0,0 +1,10 @@
+## Checking commands
+After writing code, always run from `backend/`:
+```shell
+make fmt
+make check
+```
+{% if backend_services or dynamic_config %}
+{% endif %}{% if backend_services %}Mind startup imports: `make check` runs `scripts/check_imports.py`.
+{% endif %}{% if dynamic_config %}Change dynamic config only through its update methods.
+{% endif %}

template/{{ part_dir }}/{% if layout == 'root' %}README.md{% endif %}.jinja

@@ -1,20 +1,16 @@
 {%- set targets = [] -%}
-{%- if database == 'postgres' %}{% set _ = targets.append("`make migrate` (`make migrate downgrade -1` to roll back), `make revision m=\"message\"`") %}{% endif -%}
+{%- if database == 'postgres' %}{% set _ = targets.append("`make migrate`, `make revision m=\"message\"`") %}{% endif -%}
 {%- if dynamic_config and backend_services %}{% set _ = targets.append("`make script name`") %}{% endif -%}
 {%- if 'kurigram_userbot' in backend_services %}{% set _ = targets.append("`make session`") %}{% endif -%}
 # {{ project_name }}
 {% if project_description and project_description != project_name %}
 {{ project_description }}
 {% endif %}
-Runs in Docker, locally the same way as in production. `COMPOSE_PROFILES` in `.env` selects the services that run on this machine. `docker-compose.override.yml` holds what differs between machines: published ports and the aliases on the external `caddy` network.
-
 ```sh
-make env
+make env       # .env and docker-compose.override.yml from the examples
-make recreate
+make recreate  # the services in COMPOSE_PROFILES
+make check
 ```
-
+{% if targets %}
-`make env` creates `.env` and `docker-compose.override.yml` from their examples. `make recreate` starts the selected profiles, `make rebuild` builds the image first, `make logs`, `make restart` and `make down` do what they say.
+Also {{ targets | join(", ") }}.
-
+{% endif %}
-{% if backend_services %}To deploy, `git pull && make deploy`. It runs `make pre-deploy`, which builds the image only when `pyproject.toml`, `uv.lock` or `Dockerfile` changed{% if database == 'postgres' %} and applies migrations{% endif %}, then `docker compose up -d`, then `make post-deploy`, which restarts the services whose mounted code changed. A deploy system with its own `up` step calls the two hooks around it. What was built and started is remembered as `refs/deploy/*` in the clone.
-
-{% endif %}`make fmt` formats, `make check` runs ruff and ty.{% if targets %} Also {{ targets | join(", ") }}.{% endif %}