fix(database): decouple worker errors from application

tests/fixtures/architecture/dependency-baseline.json

@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6440,
-  "edge_sha256": "93995005b1d5d1da95e9ec73a39c1d92e8e8e3e3ce3751ce1035e3f31103350d",
+  "edge_count": 6451,
+  "edge_sha256": "9075d8717e384580cd6a41bc36685438770db4a8d8f18c57e6c494f32937113a",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -237,6 +237,8 @@
     "app.agent.mcp -> app.schemas.types",
     "app.agent.memory -> app.application",
     "app.agent.memory -> app.application.agentdata",
+    "app.agent.memory -> app.application.messaging",
+    "app.agent.memory -> app.application.messaging.chat",
     "app.agent.memory -> app.runtime",
     "app.agent.memory -> app.runtime.log",
     "app.agent.memory -> app.runtime.settings",
@@ -345,6 +347,8 @@
     "app.agent.orchestrator -> app.agent.tools.impl.query_system_settings",
     "app.agent.orchestrator -> app.application",
     "app.agent.orchestrator -> app.application.agentdata",
+    "app.agent.orchestrator -> app.application.messaging",
+    "app.agent.orchestrator -> app.application.messaging.chat",
     "app.agent.orchestrator -> app.application.plugin",
     "app.agent.orchestrator -> app.application.plugin.runtime",
     "app.agent.orchestrator -> app.chain",
@@ -2052,7 +2056,6 @@
     "app.api.endpoints.plugin -> app.application",
     "app.api.endpoints.plugin -> app.application.commands",
     "app.api.endpoints.plugin -> app.application.configuration",
-    "app.api.endpoints.plugin -> app.application.database",
     "app.api.endpoints.plugin -> app.application.plugin",
     "app.api.endpoints.plugin -> app.application.plugin.config",
     "app.api.endpoints.plugin -> app.application.plugin.folders",
@@ -2068,6 +2071,7 @@
     "app.api.endpoints.plugin -> app.runtime.log",
     "app.api.endpoints.plugin -> app.schemas",
     "app.api.endpoints.plugin -> app.schemas.common",
+    "app.api.endpoints.plugin -> app.schemas.exception",
     "app.api.endpoints.plugin -> app.schemas.plugin",
     "app.api.endpoints.plugin -> app.schemas.response",
     "app.api.endpoints.plugin -> app.schemas.token",
@@ -2553,8 +2557,13 @@
     "app.application.mediaserver -> app.schemas.types",
     "app.application.messaging.agent -> app.schemas",
     "app.application.messaging.agent -> app.schemas.types",
+    "app.application.messaging.chat -> app.application",
+    "app.application.messaging.chat -> app.application.database",
+    "app.application.messaging.chat -> app.runtime",
+    "app.application.messaging.chat -> app.runtime.observability",
     "app.application.messaging.chat -> app.schemas",
     "app.application.messaging.chat -> app.schemas.agent",
+    "app.application.messaging.chat -> app.schemas.exception",
     "app.application.messaging.interaction -> app.schemas",
     "app.application.messaging.interaction -> app.schemas.message",
     "app.application.messaging.interaction -> app.schemas.notification",
@@ -2641,11 +2650,12 @@
     "app.application.plugin.folders -> app.schemas",
     "app.application.plugin.folders -> app.schemas.types",
     "app.application.plugin.install -> app.application",
-    "app.application.plugin.install -> app.application.database",
     "app.application.plugin.install -> app.application.plugin",
     "app.application.plugin.install -> app.application.plugin.lifecycle",
     "app.application.plugin.install -> app.runtime",
     "app.application.plugin.install -> app.runtime.log",
+    "app.application.plugin.install -> app.schemas",
+    "app.application.plugin.install -> app.schemas.exception",
     "app.application.recognition -> app.application",
     "app.application.recognition -> app.application.configuration",
     "app.application.recognition -> app.schemas",
@@ -3675,10 +3685,10 @@
     "app.db.session -> app.runtime.config",
     "app.db.session -> app.runtime.log",
     "app.db.session -> app.runtime.observability",
-    "app.db.worker -> app.application",
-    "app.db.worker -> app.application.database",
     "app.db.worker -> app.runtime",
     "app.db.worker -> app.runtime.observability",
+    "app.db.worker -> app.schemas",
+    "app.db.worker -> app.schemas.exception",
     "app.doctor.checks -> app.adapters",
     "app.doctor.checks -> app.adapters.system",
     "app.doctor.checks -> app.adapters.system.backup",
@@ -3802,7 +3812,6 @@
     "app.factory -> app.api",
     "app.factory -> app.api.response",
     "app.factory -> app.application",
-    "app.factory -> app.application.database",
     "app.factory -> app.application.plugin",
     "app.factory -> app.application.plugin.routes",
     "app.factory -> app.application.security",
@@ -3816,6 +3825,7 @@
     "app.factory -> app.runtime.observability",
     "app.factory -> app.runtime.settings",
     "app.factory -> app.schemas",
+    "app.factory -> app.schemas.exception",
     "app.factory -> app.schemas.mcp",
     "app.factory -> app.schemas.openai",
     "app.factory -> app.schemas.response",
@@ -6094,6 +6104,7 @@
     "app.startup.modules_initializer -> app.application.history",
     "app.startup.modules_initializer -> app.application.image",
     "app.startup.modules_initializer -> app.application.messaging",
+    "app.startup.modules_initializer -> app.application.messaging.agent",
     "app.startup.modules_initializer -> app.application.messaging.chat",
     "app.startup.modules_initializer -> app.application.messaging.message",
     "app.startup.modules_initializer -> app.application.module",

tests/test_agent_chat_persistence.py

@@ -11,7 +11,7 @@ from uuid import uuid4
 import pytest
 from sqlalchemy import delete, select
 
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )

tests/test_api_response.py

@@ -23,7 +23,7 @@ from app.factory import (
     localized_unhandled_exception_handler,
     localized_validation_exception_handler,
 )
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )

tests/test_database_worker.py

@@ -6,8 +6,8 @@ from unittest.mock import patch
 
 import pytest
 
-from app.db.worker import (
-    DatabaseWorker,
+from app.db.worker import DatabaseWorker
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )

tests/test_plugin_install_command.py

@@ -3,7 +3,7 @@ from unittest.mock import AsyncMock, Mock
 
 import pytest
 
-from app.application.database import DatabaseWorkerOverloadedError
+from app.schemas.exception import DatabaseWorkerOverloadedError
 from app.application.plugin.install import PluginInstallCommand