Fix bd SearchIssues inefficient WHERE IN query pattern for Dolt

The Dolt backend's SearchIssues was using a two-phase query:
1. SELECT id FROM issues WHERE ... -> collect all IDs
2. SELECT * FROM issues WHERE id IN (id1, id2, ... id8000+)

With 8000+ issues, this second query with 8000+ placeholders hammers
Dolt CPU at 100%+. The fix changes SearchIssues to select all columns
directly in the first query and scan results inline.

See: hq-ihwsj

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

home/roles/development/default.nix

@@ -9,6 +9,15 @@ let
   # Remove after upstream fix: https://github.com/steveyegge/beads/issues/XXX
   beadsPackage = globalInputs.beads.packages.${system}.default.overrideAttrs (old: {
     vendorHash = "sha256-YU+bRLVlWtHzJ1QPzcKJ70f+ynp8lMoIeFlm+29BNPE=";
+
+    # Performance fix: avoid WHERE IN (8000+ IDs) query pattern that hammers Dolt CPU
+    # See: hq-ihwsj - bd list uses inefficient WHERE IN (all_ids) query pattern
+    # The fix changes SearchIssues to SELECT all columns directly instead of:
+    #   1. SELECT id FROM issues WHERE ... -> collect IDs
+    #   2. SELECT * FROM issues WHERE id IN (all_ids) -> 8000+ placeholder IN clause
+    patches = (old.patches or []) ++ [
+      ./beads-search-query-optimization.patch
+    ];
   });
 
   # Gastown - multi-agent workspace manager (no upstream flake.nix yet)
@@ -125,9 +134,50 @@ let
 
       # Statusline optimization: skip detached sessions and cache results
       # Reduces Dolt CPU from ~70% to ~20% by avoiding beads queries for sessions nobody is watching
-      # Cache functions already exist in upstream, we just add the early-return + cache writes
       # See: https://github.com/steveyegge/gastown/issues/TBD
       substituteInPlace internal/cmd/statusline.go \
+        --replace-fail \
+          '"strings"' \
+          '"strings"
+	"time"' \
+        --replace-fail \
+          'var (
+	statusLineSession string
+)' \
+          '// statusLineCacheTTL is how long cached status output remains valid.
+const statusLineCacheTTL = 10 * time.Second
+
+// statusLineCachePath returns the cache file path for a session.
+func statusLineCachePath(session string) string {
+	return filepath.Join(os.TempDir(), fmt.Sprintf("gt-status-%s", session))
+}
+
+// getStatusLineCache returns cached status if fresh, empty string otherwise.
+func getStatusLineCache(session string) string {
+	path := statusLineCachePath(session)
+	info, err := os.Stat(path)
+	if err != nil {
+		return ""
+	}
+	if time.Since(info.ModTime()) > statusLineCacheTTL {
+		return ""
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return ""
+	}
+	return string(data)
+}
+
+// setStatusLineCache writes status to cache file.
+func setStatusLineCache(session, status string) {
+	path := statusLineCachePath(session)
+	_ = os.WriteFile(path, []byte(status), 0644)
+}
+
+var (
+	statusLineSession string
+)' \
         --replace-fail \
           'func runStatusLine(cmd *cobra.Command, args []string) error {
 	t := tmux.NewTmux()
@@ -151,7 +201,7 @@ let
 
 	// Get session environment' \
         --replace-fail \
-          '// Output
+          '	// Output
 	if len(parts) > 0 {
 		fmt.Print(strings.Join(parts, " | ") + " |")
 	}
@@ -159,8 +209,8 @@ let
 	return nil
 }
 
-// runMayorStatusLine' \
-          '// Output
+func runMayorStatusLine(t *tmux.Tmux) error {' \
+          '	// Output
 	if len(parts) > 0 {
 		output := strings.Join(parts, " | ") + " |"
 		if statusLineSession != "" {
@@ -172,7 +222,7 @@ let
 	return nil
 }
 
-// runMayorStatusLine' \
+func runMayorStatusLine(t *tmux.Tmux) error {' \
         --replace-fail \
           'fmt.Print(strings.Join(parts, " | ") + " |")
 	return nil