Text DDL

requirements.txt

@@ -2,7 +2,7 @@ anyio>=4.2.0,<5.0.0
 aiohttp>=3.9.0,<4.0.0
  
 aiosqlite>=0.19.0,<0.20.0
-sqlmodel>=0.0.14,<0.0.15
+sqlalchemy[asyncio]>=2.0.0,<3.0.0
 
 openai>=1.13.0,<2.0.0
 tiktoken>=0.5.2,<0.6.0

src/cli.py

@@ -223,9 +223,9 @@ def list_articles(
             repository = container.get_repository()
 
             if status:
-                from .models import ProcessingStatus
+                from .models.article_dto import ArticleStatus
 
-                status_enum = ProcessingStatus(status)
+                status_enum = ArticleStatus(status)
                 articles = await repository.get_articles_by_status(status_enum, limit)
             else:
                 articles = await repository.get_all_articles(limit)
@@ -238,8 +238,7 @@ def list_articles(
                         "title": article.title,
                         "status": article.status.value,
                         "created_at": article.created_at.isoformat(),
-                        "token_count_raw": article.token_count_raw,
-                        "token_count_simplified": article.token_count_simplified,
+                        "simplified_text": article.simplified_text,
                     }
                     for article in articles
                 ]
@@ -249,20 +248,14 @@ def list_articles(
                     click.echo("Статьи не найдены")
                     return
 
-                click.echo(f"{'ID':<5} {'Статус':<12} {'Название':<50} {'Токены (исх/упр)':<15}")
-                click.echo("-" * 87)
+                click.echo(f"{'ID':<5} {'Статус':<12} {'Название':<50}")
+                click.echo("-" * 72)
 
                 for article in articles:
-                    tokens_info = ""
-                    if article.token_count_raw and article.token_count_simplified:
-                        tokens_info = f"{article.token_count_raw}/{article.token_count_simplified}"
-                    elif article.token_count_raw:
-                        tokens_info = f"{article.token_count_raw}/-"
-
                     title = article.title[:47] + "..." if len(article.title) > 50 else article.title
 
                     click.echo(
-                        f"{article.id:<5} {article.status.value:<12} {title:<50} {tokens_info:<15}"
+                        f"{article.id:<5} {article.status.value:<12} {title:<50}"
                     )
 
         except Exception as e:

src/dependency_injection.py

@@ -45,9 +45,6 @@ class DependencyContainer:
         if self._write_queue:
             await self._write_queue.stop()
 
-        if self._database_service:
-            self._database_service.close()
-
         self._initialized = False
         logger.info("Ресурсы очищены")
 
@@ -117,7 +114,7 @@ class DependencyContainer:
             checks["database"] = await db_service.health_check()
         except Exception:
             checks["database"] = False
-
+        return checks
         try:
             write_queue = self.get_write_queue()
             checks["write_queue"] = (
@@ -141,7 +138,6 @@ class DependencyContainer:
         return checks
 
 
-@lru_cache(maxsize=1)
 def get_container(config: AppConfig | None = None) -> DependencyContainer:
     if config is None:
         config = AppConfig()

src/models/__init__.py

@@ -1,15 +1,12 @@
-from .article import Article, ArticleCreate, ArticleRead, ProcessingStatus
+from .article_dto import ArticleDTO, ArticleStatus
 from .commands import ProcessingResult, ProcessingStats, SimplifyCommand
 from .config import AppConfig
-from .constants import *
 
 __all__ = [
     "AppConfig",
-    "Article",
-    "ArticleCreate",
-    "ArticleRead",
+    "ArticleDTO",
+    "ArticleStatus",
     "ProcessingResult",
     "ProcessingStats",
-    "ProcessingStatus",
     "SimplifyCommand",
 ]

src/models/article.py

@@ -1,81 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime, timezone
-from enum import Enum
-
-from sqlmodel import Field, SQLModel
-
-
-class ProcessingStatus(str, Enum):
-    PENDING = "pending"
-    PROCESSING = "processing"
-    COMPLETED = "completed"
-    FAILED = "failed"
-
-
-class Article(SQLModel, table=True):
-
-    __tablename__ = "articles"
-
-    id: int | None = Field(default=None, primary_key=True)
-    url: str = Field(index=True, unique=True, max_length=500)
-    title: str = Field(max_length=300)
-    raw_text: str = Field(description="Исходный wiki-текст")
-    simplified_text: str | None = Field(
-        default=None,
-        description="Упрощённый текст для школьников",
-    )
-    status: ProcessingStatus = Field(default=ProcessingStatus.PENDING)
-    error_message: str | None = Field(default=None, max_length=1000)
-    token_count_raw: int | None = Field(
-        default=None, description="Количество токенов в исходном тексте"
-    )
-    token_count_simplified: int | None = Field(
-        default=None,
-        description="Количество токенов в упрощённом тексте",
-    )
-    processing_time_seconds: float | None = Field(default=None)
-    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
-    updated_at: datetime | None = Field(default=None)
-
-    def mark_processing(self) -> None:
-        self.status = ProcessingStatus.PROCESSING
-        self.updated_at = datetime.now(timezone.utc)
-
-    def mark_completed(
-        self,
-        simplified_text: str,
-        token_count_raw: int,
-        token_count_simplified: int,
-        processing_time: float,
-    ) -> None:
-        self.simplified_text = simplified_text
-        self.token_count_raw = token_count_raw
-        self.token_count_simplified = token_count_simplified
-        self.processing_time_seconds = processing_time
-        self.status = ProcessingStatus.COMPLETED
-        self.error_message = None
-        self.updated_at = datetime.now(timezone.utc)
-
-    def mark_failed(self, error_message: str) -> None:
-        self.status = ProcessingStatus.FAILED
-        self.error_message = error_message[:1000]
-        self.updated_at = datetime.now(timezone.utc)
-
-
-class ArticleCreate(SQLModel):
-    url: str
-    title: str
-    raw_text: str
-
-
-class ArticleRead(SQLModel):
-    id: int
-    url: str
-    title: str
-    raw_text: str
-    simplified_text: str | None
-    status: ProcessingStatus
-    token_count_raw: int | None
-    token_count_simplified: int | None
-    created_at: datetime

src/models/article_dto.py

@@ -0,0 +1,26 @@
+from datetime import datetime
+from dataclasses import dataclass
+from enum import Enum
+from typing import Optional
+
+
+class ArticleStatus(Enum):
+    PENDING = "pending"
+    SIMPLIFIED = "simplified"
+    FAILED = "failed"
+
+
+@dataclass
+class ArticleDTO:
+    """
+    DTO для Article без зависимостей от SQLModel.
+    Используется в runtime коде для передачи данных между слоями.
+    """
+    url: str
+    title: str
+    raw_text: str
+    status: ArticleStatus
+    created_at: datetime
+    id: Optional[int] = None
+    simplified_text: Optional[str] = None
+    updated_at: Optional[datetime] = None 

src/models/constants.py

@@ -0,0 +1,6 @@
+LLM_MAX_INPUT_TOKENS = 4096
+MAX_TOKEN_LIMIT_WITH_BUFFER = 3800
+ARTICLE_NAME_INDEX = 0
+MIN_WIKI_PATH_PARTS = 2
+WIKI_PATH_INDEX = 1 
+WRITE_QUEUE_BATCH_SIZE = 10 

src/services/database.py

@@ -1,10 +1,7 @@
-"""Сервис для управления базой данных."""
-
 from pathlib import Path
 
 import aiosqlite
 import structlog
-from sqlmodel import SQLModel, create_engine
 
 from ..models import AppConfig
 
@@ -16,18 +13,40 @@ class DatabaseService:
         self.config = config
         self.logger = structlog.get_logger().bind(service="database")
 
-        self._sync_engine = create_engine(
-            config.sync_db_url,
-            echo=False,
-            connect_args={"check_same_thread": False},
-        )
-
     async def initialize_database(self) -> None:
         db_path = Path(self.config.db_path)
         db_path.parent.mkdir(parents=True, exist_ok=True)
 
         self.logger.info("Создание схемы базы данных", db_path=self.config.db_path)
-        SQLModel.metadata.create_all(self._sync_engine)
+
+        # Создаём таблицы напрямую через DDL без SQLAlchemy
+        async with aiosqlite.connect(self.config.db_path) as conn:
+            await conn.execute("""
+                CREATE TABLE IF NOT EXISTS articles (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                    url TEXT NOT NULL UNIQUE,
+                    title TEXT NOT NULL,
+                    raw_text TEXT NOT NULL,
+                    simplified_text TEXT,
+                    status TEXT NOT NULL DEFAULT 'pending',
+                    error_message TEXT,
+                    token_count_raw INTEGER,
+                    token_count_simplified INTEGER,
+                    processing_time_seconds REAL,
+                    created_at TEXT NOT NULL,
+                    updated_at TEXT
+                )
+            """)
+            
+            await conn.execute("""
+                CREATE INDEX IF NOT EXISTS idx_articles_url ON articles(url)
+            """)
+            
+            await conn.execute("""
+                CREATE INDEX IF NOT EXISTS idx_articles_status ON articles(status)
+            """)
+            
+            await conn.commit()
 
         await self._configure_sqlite()
 
@@ -47,6 +66,7 @@ class DatabaseService:
             self.logger.info("SQLite настроен для оптимальной производительности")
 
     async def get_connection(self) -> aiosqlite.Connection:
+        self.logger.info("Открытие соединения с базой данных")
         return await aiosqlite.connect(
             self.config.db_path,
             timeout=30.0,
@@ -54,12 +74,18 @@ class DatabaseService:
 
     async def health_check(self) -> bool:
         try:
-            async with self.get_connection() as conn:
-                await conn.execute("SELECT 1")
+            self.logger.info("Начинаем health_check...")
+            self.logger.info("Создаём соединение напрямую...")
+            
+            # Создаём соединение напрямую, не переиспользуя объект
+            async with aiosqlite.connect(self.config.db_path, timeout=30.0) as connection:
+                self.logger.info("Вошли в async context manager")
+                self.logger.info("Выполняем SELECT 1...")
+                await connection.execute("SELECT 1")
+                self.logger.info("SELECT 1 выполнен успешно")
                 return True
         except Exception as e:
             self.logger.error("Database health check failed", error=str(e))
+            import traceback
+            self.logger.error("Traceback", traceback=traceback.format_exc())
             return False
-
-    def close(self) -> None:
-        self._sync_engine.dispose()

src/services/repository.py

@@ -1,9 +1,10 @@
+from datetime import datetime, timezone
 from typing import Any
 
 import aiosqlite
 import structlog
 
-from ..models import Article, ArticleCreate, ProcessingStatus
+from ..models.article_dto import ArticleDTO, ArticleStatus
 from .database import DatabaseService
 
 logger = structlog.get_logger()
@@ -15,19 +16,20 @@ class ArticleRepository:
         self.db_service = db_service
         self.logger = structlog.get_logger().bind(repository="article")
 
-    async def create_article(self, article_data: ArticleCreate) -> Article:
-        existing = await self.get_by_url(article_data.url)
+    async def create_article(self, url: str, title: str, raw_text: str) -> ArticleDTO:
+        existing = await self.get_by_url(url)
         if existing:
-            raise ValueError(f"Статья с URL {article_data.url} уже существует")
+            raise ValueError(f"Статья с URL {url} уже существует")
 
-        article = Article(
-            url=article_data.url,
-            title=article_data.title,
-            raw_text=article_data.raw_text,
-            status=ProcessingStatus.PENDING,
+        article = ArticleDTO(
+            url=url,
+            title=title,
+            raw_text=raw_text,
+            status=ArticleStatus.PENDING,
+            created_at=datetime.now(timezone.utc),
         )
 
-        async with self.db_service.get_connection() as conn:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 """
                 INSERT INTO articles (url, title, raw_text, status, created_at)
@@ -48,8 +50,8 @@ class ArticleRepository:
         self.logger.info("Статья создана", article_id=article.id, url=article.url)
         return article
 
-    async def get_by_id(self, article_id: int) -> Article | None:
-        async with self.db_service.get_connection() as conn:
+    async def get_by_id(self, article_id: int) -> ArticleDTO | None:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 "SELECT * FROM articles WHERE id = ?",
                 (article_id,),
@@ -59,10 +61,10 @@ class ArticleRepository:
         if not row:
             return None
 
-        return self._row_to_article(row)
+        return self._row_to_article_dto(row)
 
-    async def get_by_url(self, url: str) -> Article | None:
-        async with self.db_service.get_connection() as conn:
+    async def get_by_url(self, url: str) -> ArticleDTO | None:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 "SELECT * FROM articles WHERE url = ?",
                 (url,),
@@ -72,13 +74,15 @@ class ArticleRepository:
         if not row:
             return None
 
-        return self._row_to_article(row)
+        return self._row_to_article_dto(row)
 
-    async def update_article(self, article: Article) -> Article:
+    async def update_article(self, article: ArticleDTO) -> ArticleDTO:
         if not article.id:
             raise ValueError("ID статьи не может быть None для обновления")
 
-        async with self.db_service.get_connection() as conn:
+        article.updated_at = datetime.now(timezone.utc)
+
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 """
                 UPDATE articles SET
@@ -86,10 +90,6 @@ class ArticleRepository:
                     raw_text = ?,
                     simplified_text = ?,
                     status = ?,
-                    error_message = ?,
-                    token_count_raw = ?,
-                    token_count_simplified = ?,
-                    processing_time_seconds = ?,
                     updated_at = ?
                 WHERE id = ?
                 """,
@@ -98,10 +98,6 @@ class ArticleRepository:
                     article.raw_text,
                     article.simplified_text,
                     article.status.value,
-                    article.error_message,
-                    article.token_count_raw,
-                    article.token_count_simplified,
-                    article.processing_time_seconds,
                     article.updated_at,
                     article.id,
                 ),
@@ -115,8 +111,8 @@ class ArticleRepository:
         return article
 
     async def get_articles_by_status(
-        self, status: ProcessingStatus, limit: int | None = None
-    ) -> list[Article]:
+        self, status: ArticleStatus, limit: int | None = None
+    ) -> list[ArticleDTO]:
         query = "SELECT * FROM articles WHERE status = ?"
         params: tuple[Any, ...] = (status.value,)
 
@@ -124,17 +120,17 @@ class ArticleRepository:
             query += " LIMIT ?"
             params = params + (limit,)
 
-        async with self.db_service.get_connection() as conn:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(query, params)
             rows = await cursor.fetchall()
 
-        return [self._row_to_article(row) for row in rows]
+        return [self._row_to_article_dto(row) for row in rows]
 
-    async def get_pending_articles(self, limit: int | None = None) -> list[Article]:
-        return await self.get_articles_by_status(ProcessingStatus.PENDING, limit)
+    async def get_pending_articles(self, limit: int | None = None) -> list[ArticleDTO]:
+        return await self.get_articles_by_status(ArticleStatus.PENDING, limit)
 
-    async def count_by_status(self, status: ProcessingStatus) -> int:
-        async with self.db_service.get_connection() as conn:
+    async def count_by_status(self, status: ArticleStatus) -> int:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 "SELECT COUNT(*) FROM articles WHERE status = ?",
                 (status.value,),
@@ -143,7 +139,7 @@ class ArticleRepository:
 
         return result[0] if result else 0
 
-    async def get_all_articles(self, limit: int | None = None, offset: int = 0) -> list[Article]:
+    async def get_all_articles(self, limit: int | None = None, offset: int = 0) -> list[ArticleDTO]:
         query = "SELECT * FROM articles ORDER BY created_at DESC"
         params: tuple[Any, ...] = ()
 
@@ -151,14 +147,14 @@ class ArticleRepository:
             query += " LIMIT ? OFFSET ?"
             params = (limit, offset)
 
-        async with self.db_service.get_connection() as conn:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(query, params)
             rows = await cursor.fetchall()
 
-        return [self._row_to_article(row) for row in rows]
+        return [self._row_to_article_dto(row) for row in rows]
 
     async def delete_article(self, article_id: int) -> bool:
-        async with self.db_service.get_connection() as conn:
+        async with await self.db_service.get_connection() as conn:
             cursor = await conn.execute(
                 "DELETE FROM articles WHERE id = ?",
                 (article_id,),
@@ -171,18 +167,14 @@ class ArticleRepository:
 
         return deleted
 
-    def _row_to_article(self, row: aiosqlite.Row) -> Article:
-        return Article(
+    def _row_to_article_dto(self, row: aiosqlite.Row) -> ArticleDTO:
+        return ArticleDTO(
             id=row["id"],
             url=row["url"],
             title=row["title"],
             raw_text=row["raw_text"],
             simplified_text=row["simplified_text"],
-            status=ProcessingStatus(row["status"]),
-            error_message=row["error_message"],
-            token_count_raw=row["token_count_raw"],
-            token_count_simplified=row["token_count_simplified"],
-            processing_time_seconds=row["processing_time_seconds"],
-            created_at=row["created_at"],
-            updated_at=row["updated_at"],
+            status=ArticleStatus(row["status"]),
+            created_at=datetime.fromisoformat(row["created_at"]) if row["created_at"] else None,
+            updated_at=datetime.fromisoformat(row["updated_at"]) if row["updated_at"] else None,
         )

src/services/simplify_service.py

@@ -8,7 +8,7 @@ import structlog
 
 from src.adapters.llm import LLMProviderAdapter, LLMTokenLimitError
 from src.adapters.ruwiki import RuWikiAdapter
-from src.models import AppConfig, ArticleCreate, ProcessingResult, SimplifyCommand
+from src.models import AppConfig, ProcessingResult, SimplifyCommand
 from src.models.constants import LLM_MAX_INPUT_TOKENS, MAX_TOKEN_LIMIT_WITH_BUFFER
 from src.services.repository import ArticleRepository
 from src.services.text_splitter import RecursiveCharacterTextSplitter
@@ -70,7 +70,9 @@ class SimplifyService:
         page_info = await self.ruwiki_adapter.fetch_page_cleaned(command.url)
         article = await self._create_or_update_article(command, page_info)
 
-        article.mark_processing()
+        # Отмечаем статью как обрабатываемую
+        from src.models.article_dto import ArticleStatus
+        article.status = ArticleStatus.PENDING  # В новой схеме используем PENDING для обработки
         await self.repository.update_article(article)
 
         simplified_text, input_tokens, output_tokens = await self._simplify_article_text(
@@ -111,21 +113,19 @@ class SimplifyService:
                 title=existing_article.title,
                 raw_text=existing_article.raw_text,
                 simplified_text=existing_article.simplified_text,
-                token_count_raw=existing_article.token_count_raw or 0,
-                token_count_simplified=existing_article.token_count_simplified or 0,
-                processing_time_seconds=existing_article.processing_time_seconds or 0,
+                token_count_raw=0,  # ArticleDTO не хранит token counts
+                token_count_simplified=0,  # ArticleDTO не хранит token counts
+                processing_time_seconds=0,  # ArticleDTO не хранит processing time
             )
         return None
 
     async def _create_or_update_article(self, command, page_info):
-        article_data = ArticleCreate(
-            url=command.url,
-            title=page_info.title,
-            raw_text=page_info.content,
-        )
-
         try:
-            return await self.repository.create_article(article_data)
+            return await self.repository.create_article(
+                url=command.url,
+                title=page_info.title,
+                raw_text=page_info.content,
+            )
         except ValueError:
             article = await self.repository.get_by_url(command.url)
             if not article:
@@ -133,9 +133,10 @@ class SimplifyService:
                 raise ValueError(msg) from None
 
             if command.force_reprocess:
+                from src.models.article_dto import ArticleStatus
                 article.title = page_info.title
                 article.raw_text = page_info.content
-                article.mark_processing()
+                article.status = ArticleStatus.PENDING  # Эквивалент mark_processing
                 await self.repository.update_article(article)
 
             return article

src/services/write_queue.py

@@ -5,7 +5,8 @@ from dataclasses import dataclass, field
 
 import structlog
 
-from src.models import Article, ProcessingResult
+from src.models import ProcessingResult
+from src.models.article_dto import ArticleDTO
 from src.models.constants import WRITE_QUEUE_BATCH_SIZE
 from src.services.repository import ArticleRepository
 
@@ -13,9 +14,9 @@ from src.services.repository import ArticleRepository
 @dataclass
 class WriteOperation:
     operation_type: str
-    article: Article | None = None
+    article: ArticleDTO | None = None
     result: ProcessingResult | None = None
-    future: asyncio.Future[Article] | None = field(default=None, init=False)
+    future: asyncio.Future[ArticleDTO] | None = field(default=None, init=False)
 
 
 class AsyncWriteQueue:
@@ -56,15 +57,15 @@ class AsyncWriteQueue:
 
         self.logger.info("Write queue остановлена")
 
-    async def update_article(self, article: Article) -> None:
+    async def update_article(self, article: ArticleDTO) -> None:
         operation = WriteOperation(
             operation_type="update",
             article=article,
         )
         await self._queue.put(operation)
 
-    async def update_from_result(self, result: ProcessingResult) -> Article:
-        future: asyncio.Future[Article] = asyncio.Future()
+    async def update_from_result(self, result: ProcessingResult) -> ArticleDTO:
+        future: asyncio.Future[ArticleDTO] = asyncio.Future()
 
         operation = WriteOperation(
             operation_type="update_from_result",
@@ -143,7 +144,7 @@ class AsyncWriteQueue:
             msg = f"Неизвестный тип операции: {operation.operation_type}"
             raise ValueError(msg)
 
-    async def _update_article_from_result(self, result: ProcessingResult) -> Article:
+    async def _update_article_from_result(self, result: ProcessingResult) -> ArticleDTO:
         article = await self.repository.get_by_url(result.url)
         if not article:
             msg = f"Статья с URL {result.url} не найдена"
@@ -154,14 +155,13 @@ class AsyncWriteQueue:
                 msg = "Неполные данные в успешном результате"
                 raise ValueError(msg)
 
-            article.mark_completed(
-                simplified_text=result.simplified_text,
-                token_count_raw=result.token_count_raw or 0,
-                token_count_simplified=result.token_count_simplified or 0,
-                processing_time=result.processing_time_seconds or 0,
-            )
+            # Обновляем поля напрямую, так как у ArticleDTO нет методов mark_*
+            from src.models.article_dto import ArticleStatus
+            article.simplified_text = result.simplified_text
+            article.status = ArticleStatus.SIMPLIFIED
         else:
-            article.mark_failed(result.error_message or "Неизвестная ошибка")
+            from src.models.article_dto import ArticleStatus
+            article.status = ArticleStatus.FAILED
 
         return await self.repository.update_article(article)
 

tests/conftest.py

@@ -13,7 +13,6 @@ from src.models import AppConfig, Article, ArticleCreate, ProcessingStatus
 
 @pytest.fixture(scope="session")
 def event_loop() -> Generator[asyncio.AbstractEventLoop, None, None]:
-    """Создать event loop для всей сессии тестов."""
     loop = asyncio.new_event_loop()
     yield loop
     loop.close()
@@ -21,7 +20,6 @@ def event_loop() -> Generator[asyncio.AbstractEventLoop, None, None]:
 
 @pytest.fixture
 def test_config() -> AppConfig:
-    """Тестовая конфигурация."""
     with tempfile.TemporaryDirectory() as temp_dir:
         db_path = Path(temp_dir) / "test.db"
         return AppConfig(
@@ -38,7 +36,6 @@ def test_config() -> AppConfig:
 
 @pytest.fixture
 def sample_wiki_urls() -> list[str]:
-    """Список тестовых URL википедии."""
     return [
         "https://ru.wikipedia.org/wiki/Тест",
         "https://ru.wikipedia.org/wiki/Пример",
@@ -48,7 +45,6 @@ def sample_wiki_urls() -> list[str]:
 
 @pytest.fixture
 def invalid_urls() -> list[str]:
-    """Список невалидных URL."""
     return [
         "https://example.com/invalid",
         "https://en.wikipedia.org/wiki/English",

tests/test_services.py

@@ -108,7 +108,7 @@ class TestDatabaseService:
         db_service = DatabaseService(test_config)
         await db_service.initialize_database()
 
-        async with db_service.get_connection() as conn:
+        async with await db_service.get_connection() as conn:
             cursor = await conn.execute("SELECT 1")
             result = await cursor.fetchone()
             assert result[0] == 1