diff --git a/docker-compose.yml b/docker-compose.yml
index d58ed84488f..ff6fdfc216e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -29,9 +29,11 @@ x-superset-volumes: &superset-volumes
   # /app/pythonpath_docker will be appended to the PYTHONPATH in the final container
   - ./docker:/app/docker
   - ./superset:/app/superset
+  - ./superset-core:/app/superset-core
   - ./superset-frontend:/app/superset-frontend
   - superset_home:/app/superset_home
   - ./tests:/app/tests
+  - superset_data:/app/data
 x-common-build: &common-build
   context: .
   target: ${SUPERSET_BUILD_TARGET:-dev} # can use `dev` (default) or `lean`
@@ -274,3 +276,5 @@ volumes:
     external: false
   redis:
     external: false
+  superset_data:
+    external: false
diff --git a/docker/docker-bootstrap.sh b/docker/docker-bootstrap.sh
index 04709396cf9..9d18b66626c 100755
--- a/docker/docker-bootstrap.sh
+++ b/docker/docker-bootstrap.sh
@@ -21,8 +21,15 @@ set -eo pipefail
 # Make python interactive
 if [ "$DEV_MODE" == "true" ]; then
     if [ "$(whoami)" = "root" ] && command -v uv > /dev/null 2>&1; then
-      echo "Reinstalling the app in editable mode"
-      uv pip install -e .
+      # Always ensure superset-core is available
+      echo "Installing superset-core in editable mode"
+      uv pip install --no-deps -e /app/superset-core
+
+      # Only reinstall the main app for non-worker processes
+      if [ "$1" != "worker" ] && [ "$1" != "beat" ]; then
+        echo "Reinstalling the app in editable mode"
+        uv pip install -e .
+      fi
     fi
 fi
 REQUIREMENTS_LOCAL="/app/docker/requirements-local.txt"
@@ -34,7 +41,8 @@ if [ "$CYPRESS_CONFIG" == "true" ]; then
     export SUPERSET__SQLALCHEMY_DATABASE_URI=postgresql+psycopg2://superset:superset@db:5432/superset_cypress
     PORT=8081
 fi
-if [[ "$DATABASE_DIALECT" == postgres* ]] && [ "$(whoami)" = "root" ]; then
+# Skip postgres requirements installation for workers to avoid conflicts
+if [[ "$DATABASE_DIALECT" == postgres* ]] && [ "$(whoami)" = "root" ] && [ "$1" != "worker" ] && [ "$1" != "beat" ]; then
     # older images may not have the postgres dev requirements installed
     echo "Installing postgres requirements"
     if command -v uv > /dev/null 2>&1; then
diff --git a/superset/extensions/__init__.py b/superset/extensions/__init__.py
index a44d82f76af..628af40cd62 100644
--- a/superset/extensions/__init__.py
+++ b/superset/extensions/__init__.py
@@ -21,7 +21,18 @@ from typing import Any, Callable, Optional
 import celery
 from flask import Flask
 from flask_appbuilder import AppBuilder
-from flask_appbuilder.utils.legacy import get_sqla_class
+
+# Temporary fix for missing flask_appbuilder.utils.legacy module
+try:
+    from flask_appbuilder.utils.legacy import get_sqla_class
+except ImportError:
+    # Fallback if legacy module doesn't exist
+    from flask_sqlalchemy import SQLAlchemy
+
+    def get_sqla_class() -> Any:
+        return SQLAlchemy
+
+
 from flask_caching.backends.base import BaseCache
 from flask_migrate import Migrate
 from flask_talisman import Talisman
diff --git a/superset/extensions/local_extensions_watcher.py b/superset/extensions/local_extensions_watcher.py
index 4616e4ff13b..5ce529687a8 100644
--- a/superset/extensions/local_extensions_watcher.py
+++ b/superset/extensions/local_extensions_watcher.py
@@ -23,29 +23,42 @@ import os
 import threading
 import time
 from pathlib import Path
-from typing import Any
+from typing import Any, TYPE_CHECKING
 
 from flask import Flask
-from watchdog.events import FileSystemEventHandler
-from watchdog.observers import Observer
+
+if TYPE_CHECKING:
+    pass
 
 logger = logging.getLogger(__name__)
 
 
-class LocalExtensionFileHandler(FileSystemEventHandler):
-    """Custom file system event handler for LOCAL_EXTENSIONS directories."""
+def _get_file_handler_class() -> Any:
+    """Get the file handler class, importing watchdog only when needed."""
+    try:
+        from watchdog.events import FileSystemEventHandler
 
-    def on_any_event(self, event: Any) -> None:
-        """Handle any file system event in the watched directories."""
-        if event.is_directory:
-            return
+        class LocalExtensionFileHandler(FileSystemEventHandler):
+            """Custom file system event handler for LOCAL_EXTENSIONS directories."""
 
-        logger.info("File change detected in LOCAL_EXTENSIONS: %s", event.src_path)
+            def on_any_event(self, event: Any) -> None:
+                """Handle any file system event in the watched directories."""
+                if event.is_directory:
+                    return
 
-        # Touch superset/__init__.py to trigger Flask's file watcher
-        superset_init = Path("superset/__init__.py")
-        logger.info("Triggering restart by touching %s", superset_init)
-        os.utime(superset_init, (time.time(), time.time()))
+                logger.info(
+                    "File change detected in LOCAL_EXTENSIONS: %s", event.src_path
+                )
+
+                # Touch superset/__init__.py to trigger Flask's file watcher
+                superset_init = Path("superset/__init__.py")
+                logger.info("Triggering restart by touching %s", superset_init)
+                os.utime(superset_init, (time.time(), time.time()))
+
+        return LocalExtensionFileHandler
+    except ImportError:
+        logger.warning("watchdog not installed, LOCAL_EXTENSIONS watcher disabled")
+        return None
 
 
 def setup_local_extensions_watcher(app: Flask) -> None:  # noqa: C901
@@ -62,6 +75,11 @@ def setup_local_extensions_watcher(app: Flask) -> None:  # noqa: C901
     if not local_extensions:
         return
 
+    # Try to import watchdog and get handler class
+    handler_class = _get_file_handler_class()
+    if not handler_class:
+        return
+
     # Collect dist directories to watch
     watch_dirs = []
     for ext_path in local_extensions:
@@ -81,8 +99,10 @@ def setup_local_extensions_watcher(app: Flask) -> None:  # noqa: C901
         return
 
     try:
+        from watchdog.observers import Observer
+
         # Set up and start the file watcher
-        event_handler = LocalExtensionFileHandler()
+        event_handler = handler_class()
         observer = Observer()
 
         for watch_dir in watch_dirs: