refactor: own subscription create transactions

tests/fixtures/architecture/dependency-baseline.json

@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6084,
-  "edge_sha256": "0dbce22b56284b845591fd38771a96c937ec898db7e9d1aece1ec47ceff8de04",
+  "edge_count": 6092,
+  "edge_sha256": "1935d43d8d3c0c3e3687109f0b81a4e56cbc4bc2ed4763a706e2b0d7c119f378",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -5873,6 +5873,7 @@
     "app.startup.modules_initializer -> app.startup.agent_initializer",
     "app.startup.modules_initializer -> app.startup.database",
     "app.startup.modules_initializer -> app.startup.managed_resources_initializer",
+    "app.startup.modules_initializer -> app.startup.subscription",
     "app.startup.monitor_initializer -> app.monitor",
     "app.startup.plugins_initializer -> app.adapters",
     "app.startup.plugins_initializer -> app.adapters.external",
@@ -5922,6 +5923,13 @@
     "app.startup.scheduler_initializer -> app.application",
     "app.startup.scheduler_initializer -> app.application.scheduling",
     "app.startup.scheduler_initializer -> app.scheduler",
+    "app.startup.subscription -> app.application",
+    "app.startup.subscription -> app.application.subscription",
+    "app.startup.subscription -> app.application.subscription.write",
+    "app.startup.subscription -> app.db",
+    "app.startup.subscription -> app.db.oper",
+    "app.startup.subscription -> app.db.oper.subscribe",
+    "app.startup.subscription -> app.db.uow",
     "app.startup.transfer_initializer -> app.chain",
     "app.startup.transfer_initializer -> app.chain.transfer",
     "app.startup.workflow_initializer -> app.workflow",
@@ -6101,7 +6109,7 @@
     "app.workflow.actions.transfer_file -> app.workflow",
     "app.workflow.actions.transfer_file -> app.workflow.actions"
   ],
-  "module_count": 756,
+  "module_count": 757,
   "modules": [
     "app",
     "app.adapters",
@@ -6836,6 +6844,7 @@
     "app.startup.plugins_initializer",
     "app.startup.routers_initializer",
     "app.startup.scheduler_initializer",
+    "app.startup.subscription",
     "app.startup.transfer_initializer",
     "app.startup.workflow_initializer",
     "app.testing",