feat(reports): refine exports and restore project access

apps/projects/models.py

@@ -130,3 +130,31 @@ class ProjectUserRate(BaseModel):
             models.Index(fields=["project"], name="pur_project_idx"),
             models.Index(fields=["user"], name="pur_user_idx"),
         ]
+
+
+class ProjectAccess(BaseModel):
+    project = models.ForeignKey(
+        Project,
+        on_delete=models.CASCADE,
+        related_name="access_memberships",
+    )
+    user = models.ForeignKey(
+        User,
+        on_delete=models.CASCADE,
+        related_name="project_accesses",
+    )
+
+    class Meta:
+        db_table = "project_access"
+        ordering = ("-created_at",)
+        constraints = [
+            models.UniqueConstraint(
+                fields=["project", "user"],
+                name="unique_project_access",
+                condition=models.Q(is_deleted=False),
+            )
+        ]
+        indexes = [
+            models.Index(fields=["project"], name="project_access_project_idx"),
+            models.Index(fields=["user"], name="project_access_user_idx"),
+        ]