fix: repair 5 MCP analysis tools with SQL errors + seed entity_status rows

- get_event_timeline: event_type/actor/message → type/source/data::text
- get_blast_radius: add JOIN entities for slug column
- get_state_snapshot: remove nonexistent disk_usage_pct, drift_count
- get_change_history: timestamp/actor_label/details → ts/actor_id::text/detail
- seed: upsert entity_status rows during inventory ingest (was empty, causing INNER JOIN on get_health_summary to return nothing)

internal/db/seed.go

@@ -131,6 +131,18 @@ func IngestInventorySeed(ctx context.Context, tx pgx.Tx, data map[string]any) (*
 		if err != nil {
 			return nil, fmt.Errorf("entity %s: %w", slug, err)
 		}
+
+		// Seed initial entity_status row so health queries return
+		// results even before the scheduler populates check results.
+		_, err = tx.Exec(ctx,
+			`INSERT INTO entity_status (entity_id, health, updated_at)
+			 VALUES ($1, 'unknown', now())
+			 ON CONFLICT (entity_id) DO NOTHING`,
+			entityID)
+		if err != nil {
+			return nil, fmt.Errorf("entity_status %s: %w", slug, err)
+		}
+
 		r.Entities++
 	}
 

internal/mcp/server.go

@@ -113,7 +113,7 @@ func newServer(pool *db.Pool, agentID uuid.UUID) *mcp.Server {
 		slug, _ := args["entity_id"].(string)
 		depth := int(getFloat(args, "depth", 3))
 		return queryRows(ctx, pool,
-			"SELECT slug, CAST(depth AS int) FROM blast_radius((SELECT id FROM entities WHERE slug = $1), $2)",
+			"SELECT e.slug, CAST(b.depth AS int) FROM blast_radius((SELECT id FROM entities WHERE slug = $1), $2) b JOIN entities e ON e.id = b.entity_id",
 			slug, depth), nil
 	})
 
@@ -430,8 +430,8 @@ func newServer(pool *db.Pool, agentID uuid.UUID) *mcp.Server {
 		args := argsMap(req)
 		limit := int(getFloat(args, "limit", 50))
 		return queryRows(ctx, pool, `
-			SELECT ev.ts, ev.event_type, ev.severity, ev.actor, e.slug AS entity_slug,
-			       ev.message, ev.correlation_id
+			SELECT ev.ts, ev.type, ev.severity, ev.source, e.slug AS entity_slug,
+			       ev.data::text AS message, ev.correlation_id
 			FROM events ev
 			LEFT JOIN entities e ON e.id = ev.entity_id
 			WHERE ($1::text IS NULL OR ev.severity = $1)
@@ -676,13 +676,13 @@ func newServer(pool *db.Pool, agentID uuid.UUID) *mcp.Server {
 		slug, _ := args["entity_slug"].(string)
 		limit := int(getFloat(args, "limit", 20))
 		return queryRows(ctx, pool, `
-			SELECT al.timestamp, al.actor_type, al.actor_label,
+			SELECT al.ts AS timestamp, al.actor_type, al.actor_id::text AS actor_label,
 			       al.action, al.method, al.path,
-			       al.details::text AS details
+			       al.detail::text AS details
 			FROM audit_log al
 			JOIN entities e ON e.id = al.entity_id
 			WHERE e.slug = $1
-			ORDER BY al.timestamp DESC
+			ORDER BY al.ts DESC
 			LIMIT $2`, slug, limit), nil
 	})
 
@@ -692,9 +692,7 @@ func newServer(pool *db.Pool, agentID uuid.UUID) *mcp.Server {
 		return queryRows(ctx, pool, `
 			SELECT e.slug, e.type, e.state,
 			       COALESCE(st.health, 'unknown') AS health,
-			       COALESCE(st.last_check_at::text, '') AS last_check,
-			       COALESCE(st.disk_usage_pct, 0) AS disk_pct,
-			       COALESCE(st.drift_count, 0) AS drift_count
+			       COALESCE(st.last_check_at::text, '') AS last_check
 			FROM entities e
 			LEFT JOIN entity_status st ON st.entity_id = e.id
 			ORDER BY st.health, e.slug