diff --git a/src/lib/userProject.ts b/src/lib/userProject.ts
new file mode 100644
index 0000000..8658329
--- /dev/null
+++ b/src/lib/userProject.ts
@@ -0,0 +1,33 @@
+"use server";
+import { prisma } from "@/lib/prisma";
+
+async function createUserProject(userId: string, projectId: string) {
+    const existing = await prisma.userProject.findUnique({ where: { userId_projectId: { userId, projectId, deletedAt: null } }});
+    if (existing) {
+        throw new Error("User project already exists");
+    }
+    return await prisma.userProject.upsert({
+        where: { userId_projectId: { userId, projectId } },
+        update: {deletedAt: null},
+        create: { userId, projectId } });
+}
+
+async function getUserProject(userId: string, projectId: string) { 
+    return await prisma.userProject.findUnique({
+        where: { userId_projectId: { userId, projectId, deletedAt: null } } }
+    );
+}
+    
+
+async function getUserProjects({userId, projectId}: { userId?: string, projectId?: string }) {
+    return await prisma.userProject.findMany({
+        where: { userId, projectId, deletedAt: null },
+    });
+}
+
+async function removeUserFromProject(userId: string, projectId: string) {
+    return await prisma.userProject.update({
+        where: { userId_projectId: { userId, projectId, deletedAt: null } },
+        data: { deletedAt: new Date() }
+    });
+}