perf(db): WAL 模式 + 性能索引 + N+1 查询消除

- SQLite 启用 WAL，允许读写并发
- 新增 6 个索引（eval_runs.status/campaign_id、eval_results.run_id、
  turns.run_id、intelligent_evals.status、task_queue.assigned_at）
- 幂等 Alembic 迁移（列/索引存在性检查）
- domain.py 计数改 func.count 聚合，get_attention_reason 单次加载 sessions
- scenario list_all 批量加载 bindings（1+N → 2 查询）
- mark_orphans_failed 批量加载 campaigns（N → 1 IN 查询）

backend/agenteval/intelligent_eval/domain.py

@@ -7,7 +7,7 @@ delegate here so a single source of truth governs "8-10h"-style semantics.
 from datetime import datetime, timedelta
 from typing import Optional
 
-from sqlmodel import Session, select
+from sqlmodel import Session, func, select
 
 from agenteval.storage.db import (
     IntelligentEvalDB,
@@ -82,21 +82,21 @@ def count_sessions_in_slot(
     start_hour, end_hour = parsed
     slot_start = (as_utc(eval_started_at) + timedelta(hours=start_hour)).replace(tzinfo=None)
     slot_end = (as_utc(eval_started_at) + timedelta(hours=end_hour)).replace(tzinfo=None)
-    rows = session.exec(
-        select(IntelligentEvalSessionDB).where(
+    return session.exec(
+        select(func.count(IntelligentEvalSessionDB.id)).where(
             IntelligentEvalSessionDB.eval_id == eval_id,
             IntelligentEvalSessionDB.created_at >= slot_start,
             IntelligentEvalSessionDB.created_at < slot_end,
         )
-    ).all()
-    return len(rows)
+    ).one()
 
 
 def count_total_sessions(eval_id: str, session: Session) -> int:
-    rows = session.exec(
-        select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.eval_id == eval_id)
-    ).all()
-    return len(rows)
+    return session.exec(
+        select(func.count(IntelligentEvalSessionDB.id)).where(
+            IntelligentEvalSessionDB.eval_id == eval_id
+        )
+    ).one()
 
 
 def calculate_session_deficit(eval_db: IntelligentEvalDB, session: Session) -> int:
@@ -146,12 +146,21 @@ def get_attention_reason(eval_db: IntelligentEvalDB, session: Session) -> Option
     plan = eval_db.get_plan()
     time_distribution = plan.get("time_distribution", [])
     current_offset = utc_now() - as_utc(eval_db.started_at)
-    if any(is_slot_due(s, current_offset) for s in time_distribution):
-        if calculate_session_deficit(eval_db, session) > 0:
-            return "slot_due"
+
+    # Load sessions once and reuse for both checks
     sessions = session.exec(
         select(IntelligentEvalSessionDB).where(IntelligentEvalSessionDB.eval_id == eval_db.id)
     ).all()
+
+    # Check slot due with deficit
+    if any(is_slot_due(s, current_offset) for s in time_distribution):
+        should_have = sum(
+            slot.get("sessions", 0) for slot in time_distribution if is_slot_due(slot, current_offset)
+        )
+        actual = len(sessions)
+        if should_have > actual:
+            return "slot_due"
+
     # ADR-0011：expired/failed 同为会话终态——存在过期会话时也必须触发 analyst，
     # 否则评估永远等不到"全部完成"而卡在 executing
     if sessions and all(s.status in ("completed", "failed", "expired") for s in sessions):

backend/agenteval/storage/db/core.py

@@ -10,6 +10,7 @@ from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any
 
+import sqlalchemy as sa
 from sqlalchemy.pool import StaticPool
 from sqlmodel import Session, SQLModel, create_engine
 
@@ -26,6 +27,12 @@ engine = create_engine(
     poolclass=StaticPool,
 )
 
+# WAL mode allows concurrent reads during writes — critical for the evaluation
+# engine's high-frequency turn/result writes while the frontend polls.
+with engine.connect() as _conn:
+    _conn.execute(sa.text("PRAGMA journal_mode=WAL"))
+    _conn.commit()
+
 
 def utc_now() -> datetime:
     return datetime.now(timezone.utc)

backend/agenteval/storage/db/eval_tables.py

@@ -87,6 +87,8 @@ class EvalRunDB(SQLModel, table=True):
             "campaign_occurrence_index",
             unique=True,
         ),
+        sa.Index("ix_eval_runs_status", "status"),
+        sa.Index("ix_eval_runs_campaign_id", "campaign_id"),
     )
 
     id: Optional[str] = Field(default_factory=new_uuid, primary_key=True)
@@ -124,6 +126,7 @@ class TurnDB(SQLModel, table=True):
     """Database table for conversation turns."""
 
     __tablename__ = "turns"
+    __table_args__ = (sa.Index("ix_turns_run_id", "run_id"),)
 
     id: Optional[str] = Field(default_factory=new_uuid, primary_key=True)
     run_id: Optional[str] = Field(default=None, foreign_key="eval_runs.id")
@@ -155,6 +158,7 @@ class EvalResultDB(SQLModel, table=True):
     """Database table for evaluation results."""
 
     __tablename__ = "eval_results"
+    __table_args__ = (sa.Index("ix_eval_results_run_id", "run_id"),)
 
     id: Optional[str] = Field(default_factory=new_uuid, primary_key=True)
     run_id: Optional[str] = Field(default=None, foreign_key="eval_runs.id")

backend/agenteval/storage/db/intelligent_eval_tables.py

@@ -13,6 +13,7 @@ class IntelligentEvalDB(SQLModel, table=True):
     """Intelligent evaluation (智能评估) — independent entity, peer to Campaign."""
 
     __tablename__ = "intelligent_evals"
+    __table_args__ = (sa.Index("ix_intelligent_evals_status", "status"),)
 
     id: Optional[str] = Field(default_factory=new_uuid, primary_key=True)
     name: str
@@ -138,6 +139,7 @@ class IntelligentEvalTaskQueueDB(SQLModel, table=True):
     __table_args__ = (
         sa.Index("idx_task_queue_status_priority", "status", "priority"),
         sa.Index("idx_task_queue_eval_status", "eval_id", "status"),
+        sa.Index("idx_task_queue_assigned_at", "assigned_at"),
     )
 
 

backend/agenteval/storage/model_config_repository.py

@@ -95,6 +95,18 @@ class ScenarioModelBindingRepository:
         )
         return {item.purpose: item.model_config_id for item in self.session.exec(statement).all()}
 
+    def get_all_for_scenarios(self, scenario_ids: list[str]) -> dict[str, dict[str, str]]:
+        """Batch load bindings for multiple scenarios to avoid N+1 queries."""
+        if not scenario_ids:
+            return {}
+        statement = select(ScenarioModelBindingDB).where(
+            ScenarioModelBindingDB.scenario_id.in_(scenario_ids),
+        )
+        result: dict[str, dict[str, str]] = {sid: {} for sid in scenario_ids}
+        for item in self.session.exec(statement).all():
+            result[item.scenario_id][item.purpose] = item.model_config_id
+        return result
+
     def replace_for_scenario(self, scenario_id: str, bindings: dict[str, str]) -> None:
         statement = select(ScenarioModelBindingDB).where(
             ScenarioModelBindingDB.scenario_id == scenario_id,

backend/agenteval/storage/repository/run.py

@@ -199,9 +199,17 @@ class RunRepository(BaseRepository[EvalRun, EvalRunDB]):
         """
         statement = select(EvalRunDB).where(EvalRunDB.status.in_(["running", "pending"]))  # type: ignore[attr-defined]
         candidates = self.session.exec(statement).all()
+
+        # Batch load all campaigns for pending runs to avoid N+1 queries
+        campaign_ids = {db.campaign_id for db in candidates if db.campaign_id and db.status == RunStatus.PENDING.value}
+        campaigns = {}
+        if campaign_ids:
+            campaign_stmt = select(CampaignDB).where(CampaignDB.id.in_(campaign_ids))  # type: ignore[attr-defined]
+            campaigns = {c.id: c for c in self.session.exec(campaign_stmt).all()}
+
         failed: list[EvalRunDB] = []
         for db in candidates:
-            if db.status == RunStatus.PENDING.value and self._is_recoverable_campaign_pending(db):
+            if db.status == RunStatus.PENDING.value and self._is_recoverable_campaign_pending(db, campaigns):
                 continue
             self._set_interrupted(db)
             failed.append(db)
@@ -209,10 +217,10 @@ class RunRepository(BaseRepository[EvalRun, EvalRunDB]):
             self.session.commit()
         return len(failed)
 
-    def _is_recoverable_campaign_pending(self, db: EvalRunDB) -> bool:
+    def _is_recoverable_campaign_pending(self, db: EvalRunDB, campaigns: dict[str, CampaignDB]) -> bool:
         if db.campaign_id is None or db.campaign_plan_index is None or db.campaign_occurrence_index is None:
             return False
-        campaign = self.session.get(CampaignDB, db.campaign_id)
+        campaign = campaigns.get(db.campaign_id)
         return campaign is not None and campaign.status == CampaignStatus.RUNNING.value
 
     def _set_interrupted(self, db: EvalRunDB) -> None:

backend/agenteval/storage/repository/scenario.py

@@ -107,6 +107,34 @@ class ScenarioRepository(BaseRepository[Scenario, ScenarioDB]):
             raise
         return True
 
+    def list_all(self) -> list[Scenario]:
+        """Batch load scenarios with bindings to avoid N+1 queries."""
+        column = getattr(self._table, self._order_by)
+        statement = select(self._table).order_by(column.desc())
+        scenarios = self.session.exec(statement).all()
+
+        # Batch load all bindings at once
+        all_bindings = ScenarioModelBindingRepository(self.session).get_all_for_scenarios(
+            [s.id for s in scenarios if s.id]
+        )
+
+        return [self._from_db_with_bindings(s, all_bindings.get(s.id or "", [])) for s in scenarios]
+
+    def _from_db_with_bindings(self, db: ScenarioDB, bindings: list) -> Scenario:
+        """Convert DB model to domain model with pre-loaded bindings."""
+        return Scenario(
+            id=db.id,
+            name=db.name,
+            description=db.description,
+            tags=db.get_tags(),
+            cases=[Case(**case) for case in db.get_cases()],
+            model_bindings=bindings,
+            llm_config=db.get_llm_config(),
+            version=db.version or 1,
+            created_at=db.created_at,
+            updated_at=db.updated_at,
+        )
+
     def name_map(self) -> dict[str, str]:
         """scenario_id → 名称映射：报告 / 时间线 / 列表等读路径共用的场景名取法。"""
         return {sid: name for sid, name in self.session.exec(select(ScenarioDB.id, ScenarioDB.name)).all()}

migrations/versions/d5f6193ba7c8_add_performance_indexes_for_query_.py

@@ -0,0 +1,91 @@
+"""add performance indexes for query optimization
+
+Revision ID: d5f6193ba7c8
+Revises: e1a2b3c4d5f6
+Create Date: 2026-08-24 21:16:08.829576
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+from sqlalchemy import inspect
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd5f6193ba7c8'
+down_revision: Union[str, Sequence[str], None] = 'e1a2b3c4d5f6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _index_exists(inspector, table_name: str, index_name: str) -> bool:
+    """Check if an index exists on a table."""
+    indexes = inspector.get_indexes(table_name)
+    return any(idx['name'] == index_name for idx in indexes)
+
+
+def _column_exists(inspector, table_name: str, column_name: str) -> bool:
+    """Check if a column exists on a table."""
+    columns = inspector.get_columns(table_name)
+    return any(col['name'] == column_name for col in columns)
+
+
+def upgrade() -> None:
+    """Add indexes for query performance optimization."""
+    conn = op.get_bind()
+    inspector = inspect(conn)
+
+    # Only create indexes that don't already exist and whose columns exist
+    if _column_exists(inspector, 'eval_results', 'run_id') and not _index_exists(inspector, 'eval_results', 'ix_eval_results_run_id'):
+        with op.batch_alter_table('eval_results', schema=None) as batch_op:
+            batch_op.create_index('ix_eval_results_run_id', ['run_id'], unique=False)
+
+    if _column_exists(inspector, 'eval_runs', 'campaign_id') and not _index_exists(inspector, 'eval_runs', 'ix_eval_runs_campaign_id'):
+        with op.batch_alter_table('eval_runs', schema=None) as batch_op:
+            batch_op.create_index('ix_eval_runs_campaign_id', ['campaign_id'], unique=False)
+
+    if _column_exists(inspector, 'eval_runs', 'status') and not _index_exists(inspector, 'eval_runs', 'ix_eval_runs_status'):
+        with op.batch_alter_table('eval_runs', schema=None) as batch_op:
+            batch_op.create_index('ix_eval_runs_status', ['status'], unique=False)
+
+    if _column_exists(inspector, 'intelligent_eval_task_queue', 'assigned_at') and not _index_exists(inspector, 'intelligent_eval_task_queue', 'idx_task_queue_assigned_at'):
+        with op.batch_alter_table('intelligent_eval_task_queue', schema=None) as batch_op:
+            batch_op.create_index('idx_task_queue_assigned_at', ['assigned_at'], unique=False)
+
+    if _column_exists(inspector, 'intelligent_evals', 'status') and not _index_exists(inspector, 'intelligent_evals', 'ix_intelligent_evals_status'):
+        with op.batch_alter_table('intelligent_evals', schema=None) as batch_op:
+            batch_op.create_index('ix_intelligent_evals_status', ['status'], unique=False)
+
+    if _column_exists(inspector, 'turns', 'run_id') and not _index_exists(inspector, 'turns', 'ix_turns_run_id'):
+        with op.batch_alter_table('turns', schema=None) as batch_op:
+            batch_op.create_index('ix_turns_run_id', ['run_id'], unique=False)
+
+
+def downgrade() -> None:
+    """Remove performance indexes."""
+    conn = op.get_bind()
+    inspector = inspect(conn)
+
+    if _index_exists(inspector, 'turns', 'ix_turns_run_id'):
+        with op.batch_alter_table('turns', schema=None) as batch_op:
+            batch_op.drop_index('ix_turns_run_id')
+
+    if _index_exists(inspector, 'intelligent_evals', 'ix_intelligent_evals_status'):
+        with op.batch_alter_table('intelligent_evals', schema=None) as batch_op:
+            batch_op.drop_index('ix_intelligent_evals_status')
+
+    if _index_exists(inspector, 'intelligent_eval_task_queue', 'idx_task_queue_assigned_at'):
+        with op.batch_alter_table('intelligent_eval_task_queue', schema=None) as batch_op:
+            batch_op.drop_index('idx_task_queue_assigned_at')
+
+    if _index_exists(inspector, 'eval_runs', 'ix_eval_runs_status'):
+        with op.batch_alter_table('eval_runs', schema=None) as batch_op:
+            batch_op.drop_index('ix_eval_runs_status')
+
+    if _index_exists(inspector, 'eval_runs', 'ix_eval_runs_campaign_id'):
+        with op.batch_alter_table('eval_runs', schema=None) as batch_op:
+            batch_op.drop_index('ix_eval_runs_campaign_id')
+
+    if _index_exists(inspector, 'eval_results', 'ix_eval_results_run_id'):
+        with op.batch_alter_table('eval_results', schema=None) as batch_op:
+            batch_op.drop_index('ix_eval_results_run_id')