feat(CF-580): Add schema support and metadata tracking for session notes recovery

- Migration 025: Add 'abandoned' status to sessions CHECK constraint (fixes blocking issue)
- Migration 026: Add recovery metadata columns (recovered_from, recovered_at) to track note recovery source
- Update sessionRecoverOrphaned to recover notes from temp files when marking sessions abandoned
- Update notes-parser to track recovery source and timestamp for analytics

These changes complete Priority 3, 5 and part of Priority 1 for CF-572 Session Notes Loss fix.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

migrations/025_add_abandoned_status.sql

@@ -0,0 +1,13 @@
+-- Migration 025: Add 'abandoned' status to sessions
+-- Purpose: Fix CF-572 schema constraint issue preventing orphan recovery
+-- Context: sessionRecoverOrphaned() tries to set status='abandoned' but constraint only allows 'active', 'completed', 'interrupted'
+
+ALTER TABLE sessions
+  DROP CONSTRAINT IF EXISTS sessions_status_check;
+
+ALTER TABLE sessions
+  ADD CONSTRAINT sessions_status_check
+  CHECK (status IN ('active', 'completed', 'interrupted', 'abandoned'));
+
+COMMENT ON CONSTRAINT sessions_status_check ON sessions
+  IS 'Valid session statuses including abandoned for orphaned sessions (CF-572)';

migrations/026_session_notes_recovery_metadata.sql

@@ -0,0 +1,16 @@
+-- Migration 026: Add recovery metadata to session_notes
+-- Purpose: Track which notes were recovered vs normally saved for CF-572 analytics
+
+ALTER TABLE session_notes
+  ADD COLUMN IF NOT EXISTS recovered_from TEXT,
+  ADD COLUMN IF NOT EXISTS recovered_at TIMESTAMP WITH TIME ZONE;
+
+CREATE INDEX IF NOT EXISTS idx_session_notes_recovered
+  ON session_notes(recovered_from)
+  WHERE recovered_from IS NOT NULL;
+
+COMMENT ON COLUMN session_notes.recovered_from
+  IS 'Source of recovery: "recovered" (daemon/orphan), "manual" (MCP tool), NULL (normal save)';
+
+COMMENT ON COLUMN session_notes.recovered_at
+  IS 'Timestamp when note was recovered (NULL for normal saves)';

src/tools/sessions.ts

@@ -487,12 +487,29 @@ export async function sessionRecoverOrphaned(args: { project?: string }): Promis
       results.push(
         `✓ Session ${session.project} #${session.session_number} marked as abandoned`
       );
+
+      // Attempt to recover notes from temp file
+      if (session.working_directory) {
+        const tempFilePath = `${session.working_directory}/.claude-session/${session.id}/notes.md`;
+
+        try {
+          const { recoverNotesFromTempFile } = await import('../utils/notes-parser.js');
+          const recovered = await recoverNotesFromTempFile(session.id, tempFilePath, 'recovered');
+
+          if (recovered > 0) {
+            results.push(`  → Recovered ${recovered} note(s) from temp file`);
+            totalNotesRecovered += recovered;
+          }
+        } catch (err) {
+          results.push(`  ⚠ Could not recover notes: ${err instanceof Error ? err.message : String(err)}`);
+        }
+      }
     } catch (err) {
       results.push(`✗ Failed to mark session ${session.id} as abandoned: ${err}`);
     }
   }
 
-  return `Recovered ${orphanedSessions.length} orphaned session(s):\n${results.join('\n')}`;
+  return `Recovered ${orphanedSessions.length} orphaned session(s), ${totalNotesRecovered} notes:\n${results.join('\n')}`;
 }
 
 /**

src/utils/notes-parser.ts

@@ -83,10 +83,10 @@ export async function recoverNotesFromTempFile(
         const embeddingValue = embedding ? formatEmbedding(embedding) : null;
 
         await execute(
-          `INSERT INTO session_notes (session_id, note_type, content, embedding, created_at)
+          `INSERT INTO session_notes (session_id, note_type, content, embedding, created_at, recovered_from, recovered_at)
-           VALUES ($1, $2, $3, $4, NOW())
+           VALUES ($1, $2, $3, $4, NOW(), $5, NOW())
            ON CONFLICT DO NOTHING`,
-          [sessionId, note.note_type, note.content, embeddingValue]
+          [sessionId, note.note_type, note.content, embeddingValue, source]
         );
 
         insertedCount++;