docs: add B7 (rename content→notes) and B8 (temporal awareness) to backlog

B8 includes research into datetime column vs metadata approach,
schema migration considerations for packaged Mac app, and MCP
temporal querying patterns. Depends on B7.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ralph/prd.json

@@ -317,6 +317,21 @@
       "description": "Publish mcp-server-standalone as an npm package so users can run it via npx ra-h-mcp-server instead of cloning the repo. Set up package.json, bin entry, and npm publishing workflow.",
       "priority": 6,
       "status": "pending"
+    },
+    {
+      "id": "B7",
+      "title": "Rename 'content' cell to 'notes' in nodes table",
+      "description": "Rename the 'content' column in the nodes table to 'notes' across the full stack: database schema, migration, services, API routes, MCP tools, UI components, and guides. Coordinate with the packaged Mac app schema.",
+      "priority": 7,
+      "status": "pending"
+    },
+    {
+      "id": "B8",
+      "title": "Temporal awareness for agents",
+      "description": "Give MCP-connected agents better temporal awareness of knowledge in the graph. Research best practices for datetime storage in SQLite and temporal querying patterns for LLM agents. Two approaches to evaluate: (1) Add a dedicated datetime column (e.g. created_at / captured_at) to the nodes table — requires an ALTER TABLE migration which is sensitive because the Mac app ships with a fixed schema. (2) Store temporal metadata in an existing metadata/JSON column to avoid schema changes. Research should cover: ISO 8601 vs Unix timestamps, timezone handling, how agents should query by time range, how to surface recency in MCP tool responses (e.g. rah_search_nodes returning temporal context), and how the start-here guide should instruct agents on temporal queries. Must coordinate with the packaged Mac app to ensure schema compatibility. Do this task directly after B7 (rename content→notes) since both touch the nodes table.",
+      "priority": 8,
+      "status": "pending",
+      "dependsOn": "B7"
     }
   ]
 }