feat: add project collaborators relations

Defined `projectCollaborators` relations in the database schema. Updated `usersRelations` and `projectsRelations` to include `projectCollaborations` and `collaborators` respectively. Added `projectCollaboratorsRelations` to establish relationships with `projects` and `users`.

backend/src/database/schema/relations.ts

@@ -7,12 +7,14 @@ import { tags } from './tags';
 import { personToGroup } from './personToGroup';
 import { personToTag } from './personToTag';
 import { projectToTag } from './projectToTag';
+import { projectCollaborators } from './projectCollaborators';
 
 /**
  * Define relations for users table
  */
 export const usersRelations = relations(users, ({ many }) => ({
   projects: many(projects),
+  projectCollaborations: many(projectCollaborators),
 }));
 
 /**
@@ -26,6 +28,7 @@ export const projectsRelations = relations(projects, ({ one, many }) => ({
   persons: many(persons),
   groups: many(groups),
   projectToTags: many(projectToTag),
+  collaborators: many(projectCollaborators),
 }));
 
 /**
@@ -99,4 +102,18 @@ export const projectToTagRelations = relations(projectToTag, ({ one }) => ({
     fields: [projectToTag.tagId],
     references: [tags.id],
   }),
-}));
+}));
+
+/**
+ * Define relations for projectCollaborators table
+ */
+export const projectCollaboratorsRelations = relations(projectCollaborators, ({ one }) => ({
+  project: one(projects, {
+    fields: [projectCollaborators.projectId],
+    references: [projects.id],
+  }),
+  user: one(users, {
+    fields: [projectCollaborators.userId],
+    references: [users.id],
+  }),
+}));