```

feat: 添加AI记忆模块和事件调度系统

- 新增AI记忆模块，支持本地记忆召回和自动写入功能
- 实现事件调度系统，支持批量处理待定事件和重试机制
- 集成心跳监控机制，跟踪API、调度器和工作节点状态
- 扩展仪表板数据统计，包含AI记忆条目和心跳概要
- 添加企业运营分析报告功能，提供财务、采购等多维度分析
- 更新配置设置，增加事件调度和AI记忆相关参数
- 优化任务队列，添加事件分发任务类型
- 扩展审计日志，记录AI记忆操作和事件调度行为
- 实现领域事件模型，支持事件持久化和状态管理
- 添加观察性服务，监控系统组件健康状况
```

app/modules/observability/service.py

@@ -1,16 +1,30 @@
+from datetime import timedelta
 from typing import Any
 
-from sqlalchemy import text
+from sqlalchemy import select, text
 from sqlalchemy.orm import Session
 
 from app.core.config import get_settings
+from app.core.constants import ActorValue
+from app.core.time import utc_now
+from app.modules.ai_memory.service import AIMemoryService
+from app.modules.audit.constants import (
+    AuditAction,
+    AuditRiskLevel,
+    AuditSource,
+    AuditTargetType,
+)
+from app.modules.audit.schemas import AuditLogCreate
+from app.modules.audit.service import AuditService
 from app.modules.events.constants import EventStatus
 from app.modules.events.service import EventService
 from app.modules.observability.constants import (
+    HeartbeatStatus,
     ObservabilityKey,
     ObservabilityMetricKey,
     ObservabilityStatus,
 )
+from app.modules.observability.models import SystemHeartbeat
 from app.modules.workflows.constants import WorkflowStatus
 from app.modules.workflows.service import WorkflowService
 
@@ -30,6 +44,7 @@ class ObservabilityService:
             ObservabilityKey.REDIS: self._redis_check(),
             ObservabilityKey.EVENTS: self._events_check(),
             ObservabilityKey.WORKFLOWS: self._workflows_check(),
+            ObservabilityKey.HEARTBEATS: self._heartbeats_check(),
         }
         degraded = any(
             item[ObservabilityKey.STATUS]
@@ -48,9 +63,75 @@ class ObservabilityService:
             ObservabilityKey.METRICS: {
                 ObservabilityKey.EVENTS: EventService(self.db).count_by_status(),
                 ObservabilityKey.WORKFLOWS: WorkflowService(self.db).count_by_status(),
+                ObservabilityKey.AI_MEMORY: AIMemoryService(self.db).count_by_status(),
+                ObservabilityKey.HEARTBEATS: self.heartbeat_summary(),
             }
         }
 
+    def record_heartbeat(
+        self,
+        component: str,
+        instance_id: str,
+        status_value: str = HeartbeatStatus.OK,
+        actor: str = ActorValue.SYSTEM,
+    ) -> dict[str, Any]:
+        now = utc_now()
+        record = self.db.execute(
+            select(SystemHeartbeat).where(
+                SystemHeartbeat.component == component,
+                SystemHeartbeat.instance_id == instance_id,
+            )
+        ).scalar_one_or_none()
+        if record is None:
+            record = SystemHeartbeat(
+                component=component,
+                instance_id=instance_id,
+                status=status_value,
+                last_seen_at=now,
+            )
+            self.db.add(record)
+        else:
+            record.status = status_value
+            record.last_seen_at = now
+            record.updated_at = now
+        self.db.commit()
+        self.db.refresh(record)
+        AuditService(self.db).log(
+            AuditLogCreate(
+                actor=actor,
+                source=AuditSource.OBSERVABILITY,
+                action=AuditAction.HEARTBEAT,
+                target_type=AuditTargetType.HEARTBEAT,
+                target_id=f"{component}:{instance_id}",
+                risk_level=AuditRiskLevel.LOW,
+                response_payload={
+                    ObservabilityMetricKey.COMPONENT: component,
+                    ObservabilityMetricKey.INSTANCE_ID: instance_id,
+                    ObservabilityKey.STATUS: status_value,
+                    ObservabilityMetricKey.LAST_SEEN_AT: record.last_seen_at.isoformat(),
+                },
+            )
+        )
+        return self._serialize_heartbeat(record)
+
+    def heartbeat_summary(self) -> dict[str, Any]:
+        records = list(self.db.execute(select(SystemHeartbeat)).scalars())
+        threshold = self._heartbeat_stale_threshold()
+        stale = [item for item in records if item.last_seen_at < threshold]
+        active = len(records) - len(stale)
+        last_seen_at = max((item.last_seen_at for item in records), default=None)
+        return {
+            ObservabilityMetricKey.TOTAL: len(records),
+            ObservabilityMetricKey.ACTIVE: active,
+            ObservabilityMetricKey.STALE: len(stale),
+            ObservabilityMetricKey.LAST_SEEN_AT: (
+                last_seen_at.isoformat() if last_seen_at else None
+            ),
+            ObservabilityMetricKey.ITEMS: [
+                self._serialize_heartbeat(item) for item in records
+            ],
+        }
+
     def _database_check(self) -> dict[str, Any]:
         try:
             self.db.execute(text("select 1")).scalar()
@@ -97,3 +178,34 @@ class ObservabilityService:
             ObservabilityMetricKey.RUNNING: counts.get(WorkflowStatus.RUNNING, 0),
             ObservabilityMetricKey.FAILED: failed,
         }
+
+    def _heartbeats_check(self) -> dict[str, Any]:
+        summary = self.heartbeat_summary()
+        total = summary[ObservabilityMetricKey.TOTAL]
+        stale = summary[ObservabilityMetricKey.STALE]
+        if total == 0:
+            return {ObservabilityKey.STATUS: ObservabilityStatus.SKIPPED}
+        return {
+            ObservabilityKey.STATUS: (
+                ObservabilityStatus.DEGRADED if stale else ObservabilityStatus.OK
+            ),
+            ObservabilityMetricKey.TOTAL: total,
+            ObservabilityMetricKey.STALE: stale,
+            ObservabilityMetricKey.LAST_SEEN_AT: summary[
+                ObservabilityMetricKey.LAST_SEEN_AT
+            ],
+        }
+
+    @staticmethod
+    def _serialize_heartbeat(record: SystemHeartbeat) -> dict[str, Any]:
+        return {
+            ObservabilityMetricKey.COMPONENT: record.component,
+            ObservabilityMetricKey.INSTANCE_ID: record.instance_id,
+            ObservabilityKey.STATUS: record.status,
+            ObservabilityMetricKey.LAST_SEEN_AT: record.last_seen_at.isoformat(),
+        }
+
+    @staticmethod
+    def _heartbeat_stale_threshold() -> Any:
+        settings = get_settings()
+        return utc_now() - timedelta(seconds=settings.heartbeat_interval_seconds * 3)