feat: add 3-tier memory layer

agent_service/memory/operational_store.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+import logging
+from datetime import datetime, timedelta
+
+logger = logging.getLogger(__name__)
+
+
+class OperationalStore:
+    def __init__(self, pool):
+        self._pool = pool
+
+    async def store(self, scope, summary, raw_data=None, ttl_days=90, source_directive_id=None):
+        expires_at = datetime.utcnow() + timedelta(days=ttl_days)
+        async with self._pool.acquire(timeout=10) as conn:
+            await conn.execute(
+                """INSERT INTO ab_operational_memory
+                   (scope, summary, raw_data, source_directive_id, expires_at)
+                   VALUES ($1, $2, $3, $4, $5)""",
+                scope, summary, raw_data, source_directive_id, expires_at)
+
+    async def get_recent(self, scope, limit=10):
+        async with self._pool.acquire(timeout=10) as conn:
+            rows = await conn.fetch(
+                """SELECT id, scope, summary, raw_data, created_at
+                   FROM ab_operational_memory
+                   WHERE scope = $1 AND (expires_at IS NULL OR expires_at > NOW())
+                   ORDER BY created_at DESC LIMIT $2""",
+                scope, limit)
+        return [dict(r) for r in rows]
+
+    async def prune_expired(self):
+        async with self._pool.acquire(timeout=10) as conn:
+            result = await conn.execute(
+                'DELETE FROM ab_operational_memory WHERE expires_at IS NOT NULL AND expires_at < NOW()')
+        logger.info('OperationalStore.prune_expired: %s', result)