Query Manager Service

from typing import Dict, Any, List, Optional
from dataclasses import dataclass
from enum import Enum

class QueryStatus(Enum):
    """Query execution status"""
    SUCCESS = "success"
    FAILED = "failed"
    STOPPED = "stopped"
    RUNNING = "running"
    PENDING = "pending"

@dataclass
class QueryResult:
    """Query execution result with metadata"""
    query_id: int
    sql: str
    status: QueryStatus
    start_time: float
    end_time: Optional[float]
    rows: Optional[List[Dict[str, Any]]]
    error_message: Optional[str]
    database_name: str
    schema: Optional[str]

@dataclass
class TabState:
    """Editor tab state for persistence"""
    tab_id: str
    user_id: int
    sql: str
    database_id: int
    schema: Optional[str]

class QueryManager:
    """Manages SQL query execution and history"""

    def __init__(self, db_connection: Any):
        """
        Initialize query manager with database connection.

        Args:
            db_connection: Database connection object
        """
        pass

    def execute_sync_query(
        self,
        sql: str,
        database_name: str,
        schema: Optional[str] = None,
        timeout: int = 30,
        limit: int = 1000,
        user_id: Optional[int] = None
    ) -> QueryResult:
        """
        Execute a SQL query synchronously with timeout protection.

        Args:
            sql: SQL query text to execute
            database_name: Name of the database to query
            schema: Optional schema name
            timeout: Query timeout in seconds
            limit: Maximum number of rows to return
            user_id: Optional user ID for query history

        Returns:
            QueryResult with execution metadata and results
        """
        pass

    def execute_async_query(
        self,
        sql: str,
        database_name: str,
        schema: Optional[str] = None,
        user_id: Optional[int] = None
    ) -> int:
        """
        Submit a query for asynchronous execution.

        Args:
            sql: SQL query text to execute
            database_name: Name of the database to query
            schema: Optional schema name
            user_id: Optional user ID for query history

        Returns:
            Query ID for tracking execution
        """
        pass

    def get_query_progress(self, query_id: int) -> int:
        """
        Get execution progress for an async query.

        Args:
            query_id: Query identifier

        Returns:
            Progress percentage (0-100)
        """
        pass

    def cancel_query(self, query_id: int) -> bool:
        """
        Cancel a running query.

        Args:
            query_id: Query identifier

        Returns:
            True if query was cancelled successfully
        """
        pass

    def get_query_history(
        self,
        user_id: Optional[int] = None,
        limit: int = 100
    ) -> List[QueryResult]:
        """
        Retrieve query execution history.

        Args:
            user_id: Optional filter by user ID
            limit: Maximum number of history entries to return

        Returns:
            List of query results from history
        """
        pass

    def save_tab_state(self, tab_state: TabState) -> bool:
        """
        Save editor tab state for session persistence.

        Args:
            tab_state: Tab state to persist

        Returns:
            True if saved successfully
        """
        pass

    def get_tab_state(self, tab_id: str, user_id: int) -> Optional[TabState]:
        """
        Retrieve saved tab state.

        Args:
            tab_id: Tab identifier
            user_id: User identifier

        Returns:
            TabState if found, None otherwise
        """
        pass