diff --git a/backend/projects_registry.py b/backend/projects_registry.py
index 8833da4..449f287 100644
--- a/backend/projects_registry.py
+++ b/backend/projects_registry.py
@@ -16,16 +16,60 @@ def load_projects():
         return []
 
 
-def save_project(project: dict):
-    projects = load_projects()
-
-    existing = [p for p in projects if p.get('repo_url') != project.get('repo_url')]
-    existing.append(project)
-
+def save_projects(projects: list[dict]) -> list[dict]:
     REGISTRY_FILE.parent.mkdir(parents=True, exist_ok=True)
     REGISTRY_FILE.write_text(
-        json.dumps(existing, ensure_ascii=False, indent=2),
+        json.dumps(projects, ensure_ascii=False, indent=2),
         encoding='utf-8'
     )
+    return projects
 
-    return existing
+
+def save_project(project: dict):
+    projects = load_projects()
+    existing_project = None
+
+    for item in projects:
+        if item.get('repo_url') == project.get('repo_url') or item.get('workspace') == project.get('workspace'):
+            existing_project = item
+            break
+
+    if existing_project:
+        merged = {**existing_project, **project}
+        projects = [merged if p is existing_project else p for p in projects]
+    else:
+        projects.append(project)
+
+    return save_projects(projects)
+
+
+def find_project_by_workspace(workspace: str) -> dict | None:
+    for project in load_projects():
+        if project.get('workspace') == workspace:
+            return project
+    return None
+
+
+def find_project_by_repo(repo_url: str) -> dict | None:
+    for project in load_projects():
+        if project.get('repo_url') == repo_url:
+            return project
+    return None
+
+
+def update_project_settings(workspace: str, settings: dict) -> dict | None:
+    projects = load_projects()
+    updated = None
+
+    for index, project in enumerate(projects):
+        if project.get('workspace') == workspace:
+            merged = {**project, **settings}
+            projects[index] = merged
+            updated = merged
+            break
+
+    if updated is None:
+        return None
+
+    save_projects(projects)
+    return updated