feat(memory): add DatabaseMemoryService with SQL backend and agent scratchpad

pyproject.toml

@@ -32,6 +32,7 @@ dependencies = [
   # go/keep-sorted end
   "orjson>=3.11.3",
 ]
+
 dynamic = ["version"]
 
 [project.urls]
@@ -45,6 +46,11 @@ test = [
     "pytest>=8.4.2",
     "pytest-asyncio>=1.2.0",
 ]
+sqlalchemy = [
+    # Required for DatabaseMemoryService; aiosqlite enables SQLite async
+    "sqlalchemy[asyncio]>=2.0.0",
+    "aiosqlite>=0.19.0",
+]
 
 
 [tool.pyink]
@@ -74,6 +80,8 @@ build-backend = "flit_core.buildapi"
 dev = [
     "pytest>=8.4.2",
     "pytest-asyncio>=1.2.0",
+    "sqlalchemy[asyncio]>=2.0.0",
+    "aiosqlite>=0.19.0",
 ]
 
 

src/google/adk_community/__init__.py

@@ -15,4 +15,5 @@
 from . import memory
 from . import sessions
 from . import version
+
 __version__ = version.__version__

src/google/adk_community/memory/__init__.py

@@ -14,11 +14,20 @@
 
 """Community memory services for ADK."""
 
+try:
+  from .database_memory_service import DatabaseMemoryService
+  from .memory_search_backend import KeywordSearchBackend
+  from .memory_search_backend import MemorySearchBackend
+except ImportError:
+  pass
+
 from .open_memory_service import OpenMemoryService
 from .open_memory_service import OpenMemoryServiceConfig
 
 __all__ = [
-    "OpenMemoryService",
-    "OpenMemoryServiceConfig",
+    'DatabaseMemoryService',
+    'KeywordSearchBackend',
+    'MemorySearchBackend',
+    'OpenMemoryService',
+    'OpenMemoryServiceConfig',
 ]
-