diff --git a/.gitignore b/.gitignore
index 8099e28231f..c3779e9d503 100644
--- a/.gitignore
+++ b/.gitignore
@@ -84,3 +84,4 @@ apps/streams/data/
 
 # Generated by setup.sh
 Caddyfile
+superset-dev-data/
diff --git a/.superset/setup.sh b/.superset/setup.sh
index 53dc3adaa5d..d714cb12dba 100755
--- a/.superset/setup.sh
+++ b/.superset/setup.sh
@@ -10,11 +10,44 @@ NC='\033[0m'
 # Step tracking
 declare -a FAILED_STEPS=()
 declare -a SKIPPED_STEPS=()
+FORCE_OVERWRITE_DATA=0
 
 error() { echo -e "${RED}✗${NC} $1"; }
 success() { echo -e "${GREEN}✓${NC} $1"; }
 warn() { echo -e "${YELLOW}!${NC} $1"; }
 
+print_usage() {
+  cat <<EOF
+Usage: .superset/setup.sh [options]
+
+Options:
+  -f, --force              Reset superset-dev-data/ before seeding local DB
+  -h, --help               Show this help message
+EOF
+}
+
+parse_args() {
+  while [ $# -gt 0 ]; do
+    case "$1" in
+      -f|--force)
+        FORCE_OVERWRITE_DATA=1
+        shift
+        ;;
+      -h|--help)
+        print_usage
+        exit 0
+        ;;
+      *)
+        error "Unknown argument: $1"
+        print_usage
+        return 1
+        ;;
+    esac
+  done
+
+  return 0
+}
+
 # Track step failure
 step_failed() {
   FAILED_STEPS+=("$1")
@@ -332,6 +365,7 @@ step_write_env() {
     echo ""
     echo "# Workspace Identity"
     echo "SUPERSET_WORKSPACE_NAME=${WORKSPACE_NAME:-$(basename "$PWD")}"
+    echo "SUPERSET_HOME_DIR=$PWD/superset-dev-data"
     echo ""
     echo "# Workspace Database (Neon Branch)"
     if [ -n "${BRANCH_ID:-}" ]; then
@@ -476,7 +510,65 @@ PORTSJSON
   return 0
 }
 
+step_seed_local_db() {
+  echo "💾 Seeding local DB into superset-dev-data/..."
+
+  local source_db="$HOME/.superset/local.db"
+  local dev_data_dir="superset-dev-data"
+  local dest_db="$dev_data_dir/local.db"
+  local force_overwrite="$FORCE_OVERWRITE_DATA"
+
+  if [ "$force_overwrite" = "1" ] && [ -d "$dev_data_dir" ]; then
+    warn "Force overwrite enabled — removing existing $dev_data_dir/"
+    if ! rm -rf "$dev_data_dir"; then
+      error "Failed to remove existing $dev_data_dir/"
+      return 1
+    fi
+  fi
+
+  if [ ! -f "$source_db" ]; then
+    warn "No source local.db found at $source_db — skipping (app will create a fresh one)"
+    step_skipped "Seed local DB (no source DB)"
+    return 0
+  fi
+
+  if [ -f "$dest_db" ] && [ "$force_overwrite" != "1" ]; then
+    warn "Destination DB already exists at $dest_db — skipping seed (use -f/--force)"
+    step_skipped "Seed local DB (already exists)"
+    return 0
+  fi
+
+  mkdir -p "$dev_data_dir"
+  chmod 700 "$dev_data_dir"
+
+  # Copy all SQLite files so WAL data isn't lost when source is held open.
+  for ext in "" "-shm" "-wal"; do
+    local source_file="${source_db}${ext}"
+    local dest_file="${dest_db}${ext}"
+
+    if [ -f "$source_file" ]; then
+      if ! cp "$source_file" "$dest_file"; then
+        error "Failed to copy $source_file to $dest_file"
+        return 1
+      fi
+      chmod 600 "$dest_file"
+    fi
+  done
+
+  # Checkpoint the copy's WAL (no lock contention since nothing else has it open).
+  if command -v sqlite3 &> /dev/null; then
+    sqlite3 "$dest_db" "PRAGMA wal_checkpoint(TRUNCATE);" &> /dev/null || true
+  fi
+
+  success "Local DB seeded from $source_db"
+  return 0
+}
+
 main() {
+  if ! parse_args "$@"; then
+    return 1
+  fi
+
   echo "🚀 Setting up Superset workspace..."
   echo ""
 
@@ -495,17 +587,22 @@ main() {
     step_failed "Install dependencies"
   fi
 
-  # Step 4: Setup Neon branch
+  # Step 4: Seed local DB into superset-dev-data/
+  if ! step_seed_local_db; then
+    step_failed "Seed local DB"
+  fi
+
+  # Step 5: Setup Neon branch
   if ! step_setup_neon_branch; then
     step_failed "Setup Neon branch"
   fi
 
-  # Step 5: Start Electric SQL
+  # Step 6: Start Electric SQL
   if ! step_start_electric; then
     step_failed "Start Electric SQL"
   fi
 
-  # Step 6: Write .env file
+  # Step 7: Write .env file
   if ! step_write_env; then
     step_failed "Write .env file"
   fi
diff --git a/.superset/teardown.sh b/.superset/teardown.sh
index e049943743c..c8c47d0fa35 100755
--- a/.superset/teardown.sh
+++ b/.superset/teardown.sh
@@ -10,11 +10,44 @@ NC='\033[0m'
 # Step tracking
 declare -a FAILED_STEPS=()
 declare -a SKIPPED_STEPS=()
+REMOVE_DEV_DATA=0
 
 error() { echo -e "${RED}✗${NC} $1"; }
 success() { echo -e "${GREEN}✓${NC} $1"; }
 warn() { echo -e "${YELLOW}!${NC} $1"; }
 
+print_usage() {
+  cat <<EOF
+Usage: .superset/teardown.sh [options]
+
+Options:
+  -f, --force              Remove superset-dev-data/ in current workspace
+  -h, --help               Show this help message
+EOF
+}
+
+parse_args() {
+  while [ $# -gt 0 ]; do
+    case "$1" in
+      -f|--force)
+        REMOVE_DEV_DATA=1
+        shift
+        ;;
+      -h|--help)
+        print_usage
+        exit 0
+        ;;
+      *)
+        error "Unknown argument: $1"
+        print_usage
+        return 1
+        ;;
+    esac
+  done
+
+  return 0
+}
+
 # Track step failure
 step_failed() {
   FAILED_STEPS+=("$1")
@@ -209,7 +242,36 @@ step_delete_neon_branch() {
   return 0
 }
 
+step_remove_dev_data() {
+  local dev_data_dir="superset-dev-data"
+
+  if [ "$REMOVE_DEV_DATA" != "1" ]; then
+    step_skipped "Remove superset-dev-data (flag not set)"
+    return 0
+  fi
+
+  echo "🗑️  Removing $dev_data_dir/..."
+
+  if [ ! -d "$dev_data_dir" ]; then
+    warn "$dev_data_dir/ not found, skipping"
+    step_skipped "Remove superset-dev-data (not found)"
+    return 0
+  fi
+
+  if ! rm -rf "$dev_data_dir"; then
+    error "Failed to remove $dev_data_dir/"
+    return 1
+  fi
+
+  success "Removed $dev_data_dir/"
+  return 0
+}
+
 main() {
+  if ! parse_args "$@"; then
+    return 1
+  fi
+
   echo "🧹 Tearing down Superset workspace..."
   echo ""
 
@@ -236,6 +298,11 @@ main() {
     step_failed "Delete Neon branch"
   fi
 
+  # Step 6: Remove superset-dev-data (optional)
+  if ! step_remove_dev_data; then
+    step_failed "Remove superset-dev-data"
+  fi
+
   # Print summary and exit with appropriate code
   print_summary
 }
diff --git a/apps/desktop/src/main/lib/app-environment.ts b/apps/desktop/src/main/lib/app-environment.ts
index 978cbe5bafa..945043f352e 100644
--- a/apps/desktop/src/main/lib/app-environment.ts
+++ b/apps/desktop/src/main/lib/app-environment.ts
@@ -3,7 +3,11 @@ import { homedir } from "node:os";
 import { join } from "node:path";
 import { SUPERSET_DIR_NAME } from "shared/constants";
 
-export const SUPERSET_HOME_DIR = join(homedir(), SUPERSET_DIR_NAME);
+const SUPERSET_HOME_DIR_ENV = "SUPERSET_HOME_DIR";
+
+export const SUPERSET_HOME_DIR =
+	process.env[SUPERSET_HOME_DIR_ENV] || join(homedir(), SUPERSET_DIR_NAME);
+process.env[SUPERSET_HOME_DIR_ENV] = SUPERSET_HOME_DIR;
 
 export const SUPERSET_HOME_DIR_MODE = 0o700;
 export const SUPERSET_SENSITIVE_FILE_MODE = 0o600;
diff --git a/apps/desktop/src/main/lib/notifications/map-event-type.ts b/apps/desktop/src/main/lib/notifications/map-event-type.ts
new file mode 100644
index 00000000000..8d01eae3757
--- /dev/null
+++ b/apps/desktop/src/main/lib/notifications/map-event-type.ts
@@ -0,0 +1,24 @@
+/**
+ * Maps incoming event types to canonical lifecycle events.
+ * Handles variations from different agent CLIs.
+ *
+ * Returns null for unknown events so callers can ignore safely
+ * for forward compatibility.
+ */
+export function mapEventType(
+	eventType: string | undefined,
+): "Start" | "Stop" | "PermissionRequest" | null {
+	if (!eventType) {
+		return null;
+	}
+	if (eventType === "Start" || eventType === "UserPromptSubmit") {
+		return "Start";
+	}
+	if (eventType === "PermissionRequest") {
+		return "PermissionRequest";
+	}
+	if (eventType === "Stop" || eventType === "agent-turn-complete") {
+		return "Stop";
+	}
+	return null;
+}
diff --git a/apps/desktop/src/main/lib/notifications/server.test.ts b/apps/desktop/src/main/lib/notifications/server.test.ts
index 94e095508e9..c83562d2a11 100644
--- a/apps/desktop/src/main/lib/notifications/server.test.ts
+++ b/apps/desktop/src/main/lib/notifications/server.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from "bun:test";
-import { mapEventType } from "./server";
+import { mapEventType } from "./map-event-type";
 
 describe("notifications/server", () => {
 	describe("mapEventType", () => {
diff --git a/apps/desktop/src/main/lib/notifications/server.ts b/apps/desktop/src/main/lib/notifications/server.ts
index 7f4e849d50b..54e54b8d542 100644
--- a/apps/desktop/src/main/lib/notifications/server.ts
+++ b/apps/desktop/src/main/lib/notifications/server.ts
@@ -5,6 +5,7 @@ import { env } from "shared/env.shared";
 import type { AgentLifecycleEvent } from "shared/notification-types";
 import { appState } from "../app-state";
 import { HOOK_PROTOCOL_VERSION } from "../terminal/env";
+import { mapEventType } from "./map-event-type";
 
 // Re-export types for backwards compatibility
 export type {
@@ -36,36 +37,6 @@ app.use((req, res, next) => {
 	next();
 });
 
-/**
- * Maps incoming event types to canonical lifecycle events.
- * Handles variations from different agent CLIs.
- *
- * Returns null for unknown events - caller should ignore these gracefully
- * to maintain forward compatibility with newer hook versions.
- *
- * Note: We no longer default missing eventType to "Stop" to prevent
- * parse failures from being treated as completions.
- *
- * @internal Exported for testing
- */
-export function mapEventType(
-	eventType: string | undefined,
-): "Start" | "Stop" | "PermissionRequest" | null {
-	if (!eventType) {
-		return null; // Missing eventType should be ignored, not treated as Stop
-	}
-	if (eventType === "Start" || eventType === "UserPromptSubmit") {
-		return "Start";
-	}
-	if (eventType === "PermissionRequest") {
-		return "PermissionRequest";
-	}
-	if (eventType === "Stop" || eventType === "agent-turn-complete") {
-		return "Stop";
-	}
-	return null; // Unknown events are ignored for forward compatibility
-}
-
 /**
  * Resolves paneId from tabId or workspaceId using synced tabs state.
  * Falls back to focused pane in active tab.