feat(pricing): add workspace user rates and price units

apps/projects/api/serializers.py

@@ -3,8 +3,6 @@ from core.serializers.base import BaseModelSerializer
 from apps.projects.models import (
     Project, 
     ProjectMembership, 
-    ProjectRate, 
-    ProjectUserRate,
 )
 from core.serializers.mini import UserMiniSerializer
 
@@ -97,49 +95,3 @@ class ProjectMembershipCreateSerializer(serializers.Serializer):
 class ProjectMembershipUpdateSerializer(serializers.Serializer):
     role = serializers.ChoiceField(choices=ProjectMembership.Role.choices, required=False)
     is_active = serializers.BooleanField(required=False)
-
-
-class ProjectRateSerializer(BaseModelSerializer):
-    class Meta:
-        model = ProjectRate
-        fields = BaseModelSerializer.Meta.fields + (
-            "project",
-            "hourly_rate",
-            "currency",
-        )
-        read_only_fields = fields
-
-
-class ProjectRateCreateSerializer(serializers.Serializer):
-    project_id = serializers.UUIDField()
-    hourly_rate = serializers.DecimalField(max_digits=10, decimal_places=2)
-    currency = serializers.CharField(max_length=3, default="USD")
-
-
-class ProjectRateUpdateSerializer(serializers.Serializer):
-    hourly_rate = serializers.DecimalField(max_digits=10, decimal_places=2, required=False)
-    currency = serializers.CharField(max_length=3, required=False)
-
-
-class ProjectUserRateSerializer(BaseModelSerializer):
-    class Meta:
-        model = ProjectUserRate
-        fields = BaseModelSerializer.Meta.fields + (
-            "project",
-            "user",
-            "hourly_rate",
-            "currency",
-        )
-        read_only_fields = fields
-
-
-class ProjectUserRateCreateSerializer(serializers.Serializer):
-    project_id = serializers.UUIDField()
-    user_id = serializers.UUIDField()
-    hourly_rate = serializers.DecimalField(max_digits=10, decimal_places=2)
-    currency = serializers.CharField(max_length=3, default="USD")
-
-
-class ProjectUserRateUpdateSerializer(serializers.Serializer):
-    hourly_rate = serializers.DecimalField(max_digits=10, decimal_places=2, required=False)
-    currency = serializers.CharField(max_length=3, required=False)

apps/projects/api/urls.py

@@ -4,8 +4,6 @@ from rest_framework.routers import DefaultRouter
 from apps.projects.api.views import (
     ProjectViewSet,
     ProjectMembershipViewSet,
-    ProjectRateViewSet,
-    ProjectUserRateViewSet
 )
 
 app_name = "projects"
@@ -13,8 +11,6 @@ app_name = "projects"
 router = DefaultRouter()
 router.register(r"projects", ProjectViewSet, basename="project")
 router.register(r"memberships", ProjectMembershipViewSet, basename="membership")
-router.register(r"rates", ProjectRateViewSet, basename="rate")
-router.register(r"user-rates", ProjectUserRateViewSet, basename="user-rate")
 
 urlpatterns = [
     path("", include(router.urls)),

apps/projects/api/views.py

@@ -22,14 +22,10 @@ from apps.clients.models import Client
 from apps.projects.models import (
     Project, 
     ProjectMembership, 
-    ProjectRate, 
-    ProjectUserRate,
 )
 from apps.projects.api.serializers import (
     ProjectSerializer, ProjectCreateSerializer, ProjectUpdateSerializer,
     ProjectMembershipSerializer, ProjectMembershipCreateSerializer, ProjectMembershipUpdateSerializer,
-    ProjectRateSerializer, ProjectRateCreateSerializer, ProjectRateUpdateSerializer,
-    ProjectUserRateSerializer, ProjectUserRateCreateSerializer, ProjectUserRateUpdateSerializer
 )
 from apps.projects.api.permissions import IsProjectMember, IsProjectManager
 from apps.projects.services.projects import (
@@ -38,10 +34,6 @@ from apps.projects.services.projects import (
     toggle_project_archive
 )
 from apps.projects.services.memberships import add_project_member, update_project_member
-from apps.projects.services.rates import (
-    create_project_rate, update_project_rate, 
-    create_project_user_rate, update_project_user_rate
-)
 from apps.workspaces.services import (
     PROJECTS_ARCHIVE,
     PROJECTS_CREATE,
@@ -363,96 +355,3 @@ class ProjectMembershipViewSet(BaseProjectNestedViewSet):
             role=role,
         )
         return Response(status=status.HTTP_204_NO_CONTENT)
-
-
-class ProjectRateViewSet(BaseProjectNestedViewSet):
-    filterset_fields = ["project", "currency"]
-
-    def get_queryset(self):
-        if not self.request.user.is_authenticated: return ProjectRate.objects.none()
-        return ProjectRate.objects.filter(
-            project__memberships__user=self.request.user,
-            project__memberships__is_active=True,
-            is_deleted=False
-        ).distinct()
-
-    def get_serializer_class(self):
-        if self.action == "create": return ProjectRateCreateSerializer
-        if self.action in ["update", "partial_update"]: return ProjectRateUpdateSerializer
-        return ProjectRateSerializer
-
-    def create(self, request, *args, **kwargs):
-        serializer = self.get_serializer(data=request.data)
-        serializer.is_valid(raise_exception=True)
-        
-        project_id = serializer.validated_data["project_id"]
-        self.verify_manager_access(project_id)
-        
-        project = get_object_or_404(Project, id=project_id, is_deleted=False)
-        rate = create_project_rate(
-            project=project,
-            hourly_rate=serializer.validated_data["hourly_rate"],
-            currency=serializer.validated_data.get("currency", "USD")
-        )
-        return Response(ProjectRateSerializer(rate).data, status=status.HTTP_201_CREATED)
-
-    def update(self, request, *args, **kwargs):
-        rate = self.get_object()
-        serializer = self.get_serializer(data=request.data, partial=kwargs.pop("partial", False))
-        serializer.is_valid(raise_exception=True)
-        
-        updated_rate = update_project_rate(rate, **serializer.validated_data)
-        return Response(ProjectRateSerializer(updated_rate).data, status=status.HTTP_200_OK)
-
-    def destroy(self, request, *args, **kwargs):
-        rate = self.get_object()
-        rate.is_deleted = True
-        rate.save(update_fields=["is_deleted", "updated_at"])
-        return Response(status=status.HTTP_204_NO_CONTENT)
-
-
-class ProjectUserRateViewSet(BaseProjectNestedViewSet):
-    filterset_fields = ["project", "user", "currency"]
-
-    def get_queryset(self):
-        if not self.request.user.is_authenticated: return ProjectUserRate.objects.none()
-        return ProjectUserRate.objects.filter(
-            project__memberships__user=self.request.user,
-            project__memberships__is_active=True,
-            is_deleted=False
-        ).distinct()
-
-    def get_serializer_class(self):
-        if self.action == "create": return ProjectUserRateCreateSerializer
-        if self.action in ["update", "partial_update"]: return ProjectUserRateUpdateSerializer
-        return ProjectUserRateSerializer
-
-    def create(self, request, *args, **kwargs):
-        serializer = self.get_serializer(data=request.data)
-        serializer.is_valid(raise_exception=True)
-        
-        project_id = serializer.validated_data["project_id"]
-        self.verify_manager_access(project_id)
-        
-        project = get_object_or_404(Project, id=project_id, is_deleted=False)
-        user_rate = create_project_user_rate(
-            project=project,
-            user_id=serializer.validated_data["user_id"],
-            hourly_rate=serializer.validated_data["hourly_rate"],
-            currency=serializer.validated_data.get("currency", "USD")
-        )
-        return Response(ProjectUserRateSerializer(user_rate).data, status=status.HTTP_201_CREATED)
-
-    def update(self, request, *args, **kwargs):
-        user_rate = self.get_object()
-        serializer = self.get_serializer(data=request.data, partial=kwargs.pop("partial", False))
-        serializer.is_valid(raise_exception=True)
-        
-        updated_user_rate = update_project_user_rate(user_rate, **serializer.validated_data)
-        return Response(ProjectUserRateSerializer(updated_user_rate).data, status=status.HTTP_200_OK)
-
-    def destroy(self, request, *args, **kwargs):
-        user_rate = self.get_object()
-        user_rate.is_deleted = True
-        user_rate.save(update_fields=["is_deleted", "updated_at"])
-        return Response(status=status.HTTP_204_NO_CONTENT)

apps/projects/services/rates.py

@@ -1,42 +0,0 @@
-from apps.projects.models import ProjectRate, ProjectUserRate
-
-def create_project_rate(project, hourly_rate, currency="USD"):
-    return ProjectRate.objects.create(
-        project=project,
-        hourly_rate=hourly_rate,
-        currency=currency
-    )
-
-def update_project_rate(rate_instance, **kwargs):
-    update_fields = []
-    for field, value in kwargs.items():
-        if hasattr(rate_instance, field) and getattr(rate_instance, field) != value:
-            setattr(rate_instance, field, value)
-            update_fields.append(field)
-            
-    if update_fields:
-        update_fields.append("updated_at")
-        rate_instance.save(update_fields=update_fields)
-        
-    return rate_instance
-
-def create_project_user_rate(project, user_id, hourly_rate, currency="USD"):
-    return ProjectUserRate.objects.create(
-        project=project,
-        user_id=user_id,
-        hourly_rate=hourly_rate,
-        currency=currency
-    )
-
-def update_project_user_rate(user_rate_instance, **kwargs):
-    update_fields = []
-    for field, value in kwargs.items():
-        if hasattr(user_rate_instance, field) and getattr(user_rate_instance, field) != value:
-            setattr(user_rate_instance, field, value)
-            update_fields.append(field)
-            
-    if update_fields:
-        update_fields.append("updated_at")
-        user_rate_instance.save(update_fields=update_fields)
-        
-    return user_rate_instance

apps/time_entries/services/rates.py

@@ -1,22 +1,15 @@
-from apps.projects.models import ProjectRate, ProjectUserRate
+from apps.workspaces.models import WorkspaceUserRate
 
 
 def resolve_rate(user, project):
-    user_rate = ProjectUserRate.objects.filter(
+    workspace_user_rate = WorkspaceUserRate.objects.filter(
         user=user,
-        project=project,
+        workspace=project.workspace,
         is_active=True,
+        is_deleted=False,
     ).order_by("-effective_from").first()
 
-    if user_rate:
+    if workspace_user_rate:
-        return user_rate.hourly_rate, user_rate.currency
+        return workspace_user_rate.hourly_rate, workspace_user_rate.currency
 
-    project_rate = ProjectRate.objects.filter(
+    return None, ""
-        project=project,
-        is_active=True,
-    ).order_by("-effective_from").first()
-
-    if project_rate:
-        return project_rate.hourly_rate, project_rate.currency
-
-    return None, "USD"

apps/workspaces/api/serializers.py

@@ -1,9 +1,11 @@
+from decimal import Decimal
+
 from rest_framework import serializers
 
 from apps.notifications.services import notify_workspace_membership_added
 from apps.users.models import User
 from core.serializers.base import BaseModelSerializer
-from apps.workspaces.models import Workspace, WorkspaceMembership
+from apps.workspaces.models import PriceUnit, Workspace, WorkspaceMembership, WorkspaceUserRate
 from core.serializers.mini import UserMiniSerializer
 
 
@@ -90,3 +92,68 @@ class WorkspaceMembershipSerializer(BaseModelSerializer):
             context=self.context
         ).data
         return data
+
+
+class PriceUnitSerializer(BaseModelSerializer):
+    class Meta:
+        model = PriceUnit
+        fields = BaseModelSerializer.Meta.fields + (
+            "code",
+            "name",
+            "local_name",
+            "symbol",
+        )
+        read_only_fields = fields
+
+
+class WorkspaceUserRateSerializer(BaseModelSerializer):
+    user_details = UserMiniSerializer(source="user", read_only=True)
+    price_unit = serializers.SerializerMethodField()
+
+    class Meta:
+        model = WorkspaceUserRate
+        fields = BaseModelSerializer.Meta.fields + (
+            "workspace",
+            "user",
+            "user_details",
+            "hourly_rate",
+            "currency",
+            "price_unit",
+            "effective_from",
+        )
+        read_only_fields = fields
+
+    def get_price_unit(self, obj):
+        unit = PriceUnit.objects.filter(code=obj.currency, is_deleted=False).first()
+        if not unit:
+            return None
+        return PriceUnitSerializer(unit, context=self.context).data
+
+
+class WorkspaceUserRateCreateSerializer(serializers.Serializer):
+    workspace_id = serializers.UUIDField()
+    user_id = serializers.UUIDField()
+    hourly_rate = serializers.DecimalField(max_digits=10, decimal_places=2, min_value=Decimal("0.01"))
+    currency = serializers.CharField(max_length=3, default="USD")
+
+    def validate_currency(self, value):
+        code = value.upper()
+        if not PriceUnit.objects.filter(code=code, is_deleted=False).exists():
+            raise serializers.ValidationError("Selected price unit is invalid.")
+        return code
+
+
+class WorkspaceUserRateUpdateSerializer(serializers.Serializer):
+    hourly_rate = serializers.DecimalField(
+        max_digits=10,
+        decimal_places=2,
+        min_value=Decimal("0.01"),
+        required=False,
+    )
+    currency = serializers.CharField(max_length=3, required=False)
+
+    def validate_currency(self, value):
+        code = value.upper()
+        if not PriceUnit.objects.filter(code=code, is_deleted=False).exists():
+            raise serializers.ValidationError("Selected price unit is invalid.")
+        return code

apps/workspaces/api/urls.py

@@ -1,11 +1,18 @@
 from django.urls import path, include
 from rest_framework.routers import DefaultRouter
 
-from apps.workspaces.api.views import WorkspaceViewSet, WorkspaceMembershipViewSet
+from apps.workspaces.api.views import (
+    PriceUnitViewSet,
+    WorkspaceViewSet,
+    WorkspaceMembershipViewSet,
+    WorkspaceUserRateViewSet,
+)
 
 router = DefaultRouter()
 router.register(r'workspaces', WorkspaceViewSet, basename='workspace')
 router.register(r'workspace-memberships', WorkspaceMembershipViewSet, basename='workspace-membership')
+router.register(r'price-units', PriceUnitViewSet, basename='price-unit')
+router.register(r'workspace-user-rates', WorkspaceUserRateViewSet, basename='workspace-user-rate')
 
 urlpatterns = [
     path('', include(router.urls)),

apps/workspaces/api/views.py

@@ -1,6 +1,7 @@
 from django.db.models import Q
 from django.shortcuts import get_object_or_404
 from rest_framework import status
+from rest_framework.exceptions import PermissionDenied
 from rest_framework.response import Response
 from rest_framework.filters import OrderingFilter, SearchFilter
 from django_filters.rest_framework import DjangoFilterBackend
@@ -19,14 +20,24 @@ from apps.workspaces.api.permissions import (
     IsWorkspaceMember,
     IsWorkspaceOwner,
 )
-from apps.workspaces.api.serializers import WorkspaceMembershipSerializer, WorkspaceSerializer
+from apps.workspaces.api.serializers import (
+    PriceUnitSerializer,
+    WorkspaceMembershipSerializer,
+    WorkspaceSerializer,
+    WorkspaceUserRateSerializer,
+    WorkspaceUserRateCreateSerializer,
+    WorkspaceUserRateUpdateSerializer,
+)
 from apps.workspaces.api.filters import WorkspaceFilter, WorkspaceMembershipFilter
-from apps.workspaces.models import Workspace, WorkspaceMembership
+from apps.workspaces.models import PriceUnit, Workspace, WorkspaceMembership, WorkspaceUserRate
 from apps.workspaces.services import (
     WORKSPACE_MEMBERS_VIEW,
+    WORKSPACE_EDIT,
     can_assign_workspace_role,
     can_change_workspace_membership,
     has_workspace_capability,
+    upsert_workspace_user_rate,
+    update_workspace_user_rate,
 )
 from core.paginations.limit_offset import CustomLimitOffsetPagination
 
@@ -236,3 +247,99 @@ class WorkspaceMembershipViewSet(ModelViewSet):
             role=role,
         )
         return Response(status=status.HTTP_204_NO_CONTENT)
+
+
+class PriceUnitViewSet(ModelViewSet):
+    serializer_class = PriceUnitSerializer
+    permission_classes = [IsAuthenticated]
+    http_method_names = ["get", "head", "options"]
+    pagination_class = None
+    filter_backends = (SearchFilter, OrderingFilter)
+    search_fields = ("code", "name", "local_name", "symbol")
+    ordering_fields = ("code", "name")
+    ordering = ("code",)
+
+    def get_queryset(self):
+        return PriceUnit.objects.filter(is_deleted=False)
+
+
+class WorkspaceUserRateViewSet(ModelViewSet):
+    serializer_class = WorkspaceUserRateSerializer
+    pagination_class = CustomLimitOffsetPagination
+    filter_backends = (DjangoFilterBackend, OrderingFilter)
+    filterset_fields = ("workspace", "user", "currency")
+    ordering_fields = ("effective_from", "updated_at", "created_at")
+    ordering = ("-effective_from", "-updated_at")
+
+    def get_queryset(self):
+        user = self.request.user
+        if not user.is_authenticated:
+            return WorkspaceUserRate.objects.none()
+        return WorkspaceUserRate.objects.filter(
+            workspace__memberships__user=user,
+            workspace__memberships__is_active=True,
+            is_deleted=False,
+        ).distinct()
+
+    def get_serializer_class(self):
+        if self.action == "create":
+            return WorkspaceUserRateCreateSerializer
+        if self.action in ["update", "partial_update"]:
+            return WorkspaceUserRateUpdateSerializer
+        return WorkspaceUserRateSerializer
+
+    def _ensure_manage_access(self, user, workspace):
+        if not has_workspace_capability(user, workspace, WORKSPACE_EDIT):
+            raise PermissionDenied("You do not have permission to manage workspace rates.")
+
+    def list(self, request, *args, **kwargs):
+        workspace_id = request.query_params.get("workspace")
+        if not workspace_id:
+            return Response(
+                {"detail": "workspace query parameter is required."},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        workspace = get_object_or_404(Workspace, id=workspace_id, is_deleted=False)
+        self._ensure_manage_access(request.user, workspace)
+        return super().list(request, *args, **kwargs)
+
+    def create(self, request, *args, **kwargs):
+        serializer = self.get_serializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        workspace = get_object_or_404(
+            Workspace,
+            id=serializer.validated_data["workspace_id"],
+            is_deleted=False,
+        )
+        self._ensure_manage_access(request.user, workspace)
+        rate = upsert_workspace_user_rate(
+            workspace=workspace,
+            user_id=serializer.validated_data["user_id"],
+            hourly_rate=serializer.validated_data["hourly_rate"],
+            currency=serializer.validated_data.get("currency", "USD"),
+        )
+        return Response(
+            WorkspaceUserRateSerializer(rate, context=self.get_serializer_context()).data,
+            status=status.HTTP_201_CREATED,
+        )
+
+    def update(self, request, *args, **kwargs):
+        rate = self.get_object()
+        self._ensure_manage_access(request.user, rate.workspace)
+        serializer = self.get_serializer(data=request.data, partial=kwargs.pop("partial", False))
+        serializer.is_valid(raise_exception=True)
+        updated_rate = update_workspace_user_rate(rate, **serializer.validated_data)
+        return Response(
+            WorkspaceUserRateSerializer(updated_rate, context=self.get_serializer_context()).data,
+            status=status.HTTP_200_OK,
+        )
+
+    def partial_update(self, request, *args, **kwargs):
+        kwargs["partial"] = True
+        return self.update(request, *args, **kwargs)
+
+    def destroy(self, request, *args, **kwargs):
+        rate = self.get_object()
+        self._ensure_manage_access(request.user, rate.workspace)
+        rate.delete()
+        return Response(status=status.HTTP_204_NO_CONTENT)

apps/workspaces/management/__init__.py

@@ -0,0 +1 @@
+

apps/workspaces/management/commands/__init__.py

@@ -0,0 +1 @@
+

apps/workspaces/management/commands/populate_price_units.py

@@ -0,0 +1,44 @@
+from django.core.management.base import BaseCommand
+
+from apps.workspaces.models import PriceUnit
+
+
+PRICE_UNITS = [
+    {"code": "USD", "name": "US Dollar", "local_name": "دلار آمریکا", "symbol": "$"},
+    {"code": "EUR", "name": "Euro", "local_name": "یورو", "symbol": "€"},
+    {"code": "GBP", "name": "British Pound", "local_name": "پوند بریتانیا", "symbol": "£"},
+    {"code": "AED", "name": "UAE Dirham", "local_name": "درهم امارات", "symbol": "AED"},
+    {"code": "TRY", "name": "Turkish Lira", "local_name": "لیر ترکیه", "symbol": "₺"},
+    {"code": "IRR", "name": "Iranian Rial", "local_name": "ریال", "symbol": "ریال"},
+    {"code": "IRT", "name": "Iranian Toman", "local_name": "تومان", "symbol": "تومان"},
+]
+
+
+class Command(BaseCommand):
+    help = "Populate popular price units for workspace billing rates."
+
+    def handle(self, *args, **options):
+        created = 0
+        updated = 0
+
+        for payload in PRICE_UNITS:
+            unit, was_created = PriceUnit.all_objects.update_or_create(
+                code=payload["code"],
+                defaults={
+                    "name": payload["name"],
+                    "local_name": payload["local_name"],
+                    "symbol": payload["symbol"],
+                    "is_deleted": False,
+                    "deleted_at": None,
+                },
+            )
+            if was_created:
+                created += 1
+            else:
+                updated += 1
+
+        self.stdout.write(
+            self.style.SUCCESS(
+                f"Price units populated. created={created} updated={updated}"
+            )
+        )

apps/workspaces/migrations/0002_workspaceuserrate.py

@@ -0,0 +1,89 @@
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+import uuid
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("workspaces", "0001_initial"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="WorkspaceUserRate",
+            fields=[
+                ("id", models.UUIDField(default=uuid.uuid7, primary_key=True, serialize=False)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("deleted_at", models.DateTimeField(blank=True, null=True)),
+                ("is_deleted", models.BooleanField(default=False)),
+                ("is_active", models.BooleanField(default=False)),
+                (
+                    "created_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="created_workspaces_workspaceuserrate_set",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "updated_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="updated_workspaces_workspaceuserrate_set",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                ("hourly_rate", models.DecimalField(decimal_places=2, max_digits=10)),
+                ("currency", models.CharField(default="USD", max_length=3)),
+                ("effective_from", models.DateTimeField()),
+                (
+                    "user",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="workspace_rates",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "workspace",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="user_rates",
+                        to="workspaces.workspace",
+                    ),
+                ),
+            ],
+            options={
+                "db_table": "workspace_user_rate",
+                "ordering": ("-effective_from",),
+            },
+        ),
+        migrations.AddIndex(
+            model_name="workspaceuserrate",
+            index=models.Index(fields=["id"], name="workspaceuserrate_id_idx"),
+        ),
+        migrations.AddIndex(
+            model_name="workspaceuserrate",
+            index=models.Index(fields=["workspace"], name="wur_workspace_idx"),
+        ),
+        migrations.AddIndex(
+            model_name="workspaceuserrate",
+            index=models.Index(fields=["user"], name="wur_user_idx"),
+        ),
+        migrations.AddConstraint(
+            model_name="workspaceuserrate",
+            constraint=models.UniqueConstraint(
+                condition=models.Q(("is_deleted", False)),
+                fields=("workspace", "user"),
+                name="unique_workspace_user_rate",
+            ),
+        ),
+    ]

apps/workspaces/migrations/0003_remove_workspaceuserrate_workspaceuserrate_id_idx_and_more.py

@@ -0,0 +1,30 @@
+# Generated by Django 5.2.12 on 2026-04-26 05:53
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('workspaces', '0002_workspaceuserrate'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.RemoveIndex(
+            model_name='workspaceuserrate',
+            name='workspaceuserrate_id_idx',
+        ),
+        migrations.AlterField(
+            model_name='workspaceuserrate',
+            name='created_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='created_%(app_label)s_%(class)s_set', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='workspaceuserrate',
+            name='updated_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='updated_%(app_label)s_%(class)s_set', to=settings.AUTH_USER_MODEL),
+        ),
+    ]

apps/workspaces/migrations/0004_priceunit.py

@@ -0,0 +1,45 @@
+import uuid
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("workspaces", "0003_remove_workspaceuserrate_workspaceuserrate_id_idx_and_more"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PriceUnit",
+            fields=[
+                ("id", models.UUIDField(default=uuid.uuid7, primary_key=True, serialize=False)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("deleted_at", models.DateTimeField(blank=True, null=True)),
+                ("is_deleted", models.BooleanField(default=False)),
+                ("is_active", models.BooleanField(default=False)),
+                ("code", models.CharField(max_length=8, unique=True)),
+                ("name", models.CharField(max_length=64)),
+                ("local_name", models.CharField(blank=True, max_length=64)),
+                ("symbol", models.CharField(blank=True, max_length=16)),
+                ("created_by", models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name="created_workspaces_priceunit_set", to=settings.AUTH_USER_MODEL)),
+                ("updated_by", models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name="updated_workspaces_priceunit_set", to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                "db_table": "price_unit",
+                "ordering": ("code",),
+            },
+        ),
+        migrations.AddIndex(
+            model_name="priceunit",
+            index=models.Index(fields=["id"], name="priceunit_id_idx"),
+        ),
+        migrations.AddIndex(
+            model_name="priceunit",
+            index=models.Index(fields=["code"], name="price_unit_code_idx"),
+        ),
+    ]

apps/workspaces/migrations/0005_remove_priceunit_priceunit_id_idx_and_more.py

@@ -0,0 +1,30 @@
+# Generated by Django 5.2.12 on 2026-04-26 06:25
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('workspaces', '0004_priceunit'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.RemoveIndex(
+            model_name='priceunit',
+            name='priceunit_id_idx',
+        ),
+        migrations.AlterField(
+            model_name='priceunit',
+            name='created_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='created_%(app_label)s_%(class)s_set', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AlterField(
+            model_name='priceunit',
+            name='updated_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='updated_%(app_label)s_%(class)s_set', to=settings.AUTH_USER_MODEL),
+        ),
+    ]

apps/workspaces/models.py

@@ -75,3 +75,57 @@ class WorkspaceMembership(BaseModel):
 
     def __str__(self):
         return f"{self.user} @ {self.workspace}"
+
+
+class PriceUnit(BaseModel):
+    code = models.CharField(max_length=8, unique=True)
+    name = models.CharField(max_length=64)
+    local_name = models.CharField(max_length=64, blank=True)
+    symbol = models.CharField(max_length=16, blank=True)
+
+    class Meta:
+        db_table = "price_unit"
+        ordering = ("code",)
+        indexes = [
+            models.Index(fields=["code"], name="price_unit_code_idx"),
+        ]
+
+    def __str__(self):
+        return self.code
+
+
+class WorkspaceUserRate(BaseModel):
+    workspace = models.ForeignKey(
+        Workspace,
+        on_delete=models.CASCADE,
+        related_name="user_rates",
+    )
+    user = models.ForeignKey(
+        User,
+        on_delete=models.CASCADE,
+        related_name="workspace_rates",
+    )
+    hourly_rate = models.DecimalField(
+        max_digits=10,
+        decimal_places=2,
+    )
+    currency = models.CharField(
+        max_length=3,
+        default="USD",
+    )
+    effective_from = models.DateTimeField()
+
+    class Meta:
+        db_table = "workspace_user_rate"
+        ordering = ("-effective_from",)
+        constraints = [
+            models.UniqueConstraint(
+                fields=["workspace", "user"],
+                name="unique_workspace_user_rate",
+                condition=models.Q(is_deleted=False),
+            )
+        ]
+        indexes = [
+            models.Index(fields=["workspace"], name="wur_workspace_idx"),
+            models.Index(fields=["user"], name="wur_user_idx"),
+        ]

apps/workspaces/services/__init__.py

@@ -33,6 +33,10 @@ from apps.workspaces.services.permissions import (
     has_project_capability,
     has_workspace_capability,
 )
+from apps.workspaces.services.rates import (
+    upsert_workspace_user_rate,
+    update_workspace_user_rate,
+)
 
 __all__ = [
     "WORKSPACE_VIEW",
@@ -68,4 +72,6 @@ __all__ = [
     "can_manage_workspace_members",
     "can_assign_workspace_role",
     "can_change_workspace_membership",
+    "upsert_workspace_user_rate",
+    "update_workspace_user_rate",
 ]

apps/workspaces/services/rates.py

@@ -0,0 +1,54 @@
+from django.utils import timezone
+
+from apps.workspaces.models import WorkspaceUserRate
+
+
+def upsert_workspace_user_rate(workspace, user_id, hourly_rate, currency="USD"):
+    currency = currency.upper()
+    rate = WorkspaceUserRate.objects.filter(
+        workspace=workspace,
+        user_id=user_id,
+        is_deleted=False,
+    ).first()
+
+    if rate:
+        update_fields = []
+        if rate.hourly_rate != hourly_rate:
+            rate.hourly_rate = hourly_rate
+            update_fields.append("hourly_rate")
+        if rate.currency != currency:
+            rate.currency = currency
+            update_fields.append("currency")
+        if not rate.is_active:
+            rate.is_active = True
+            update_fields.append("is_active")
+        if update_fields:
+            update_fields.append("updated_at")
+            rate.save(update_fields=update_fields)
+        return rate
+
+    return WorkspaceUserRate.objects.create(
+        workspace=workspace,
+        user_id=user_id,
+        hourly_rate=hourly_rate,
+        currency=currency,
+        effective_from=timezone.now(),
+        is_active=True,
+    )
+
+
+def update_workspace_user_rate(rate_instance, **kwargs):
+    if "currency" in kwargs and kwargs["currency"]:
+        kwargs["currency"] = kwargs["currency"].upper()
+
+    update_fields = []
+    for field, value in kwargs.items():
+        if hasattr(rate_instance, field) and getattr(rate_instance, field) != value:
+            setattr(rate_instance, field, value)
+            update_fields.append(field)
+
+    if update_fields:
+        update_fields.append("updated_at")
+        rate_instance.save(update_fields=update_fields)
+
+    return rate_instance

apps/workspaces/tests/test_rates.py

@@ -0,0 +1,132 @@
+from decimal import Decimal
+
+import pytest
+from rest_framework.test import APIClient
+
+from apps.projects.models import Project, ProjectMembership
+from apps.time_entries.services.rates import resolve_rate
+from apps.users.models import User
+from apps.workspaces.models import PriceUnit, Workspace, WorkspaceMembership, WorkspaceUserRate
+
+
+@pytest.fixture()
+def api_client():
+    return APIClient()
+
+
+@pytest.fixture()
+def owner(db):
+    return User.objects.create_user(mobile="09127770001", password="secret123")
+
+
+@pytest.fixture()
+def admin(db):
+    return User.objects.create_user(mobile="09127770002", password="secret123")
+
+
+@pytest.fixture()
+def member(db):
+    return User.objects.create_user(mobile="09127770003", password="secret123")
+
+
+@pytest.fixture()
+def workspace(owner, admin, member):
+    workspace = Workspace.objects.create(name="Rates", owner=owner)
+    WorkspaceMembership.objects.create(workspace=workspace, user=admin, role=WorkspaceMembership.Role.ADMIN, is_active=True)
+    WorkspaceMembership.objects.create(workspace=workspace, user=member, role=WorkspaceMembership.Role.MEMBER, is_active=True)
+    return workspace
+
+
+@pytest.fixture()
+def project(workspace, owner, admin, member):
+    project = Project.objects.create(workspace=workspace, name="Billing")
+    ProjectMembership.objects.create(project=project, user=owner, role=ProjectMembership.Role.MANAGER, is_active=True)
+    ProjectMembership.objects.create(project=project, user=admin, role=ProjectMembership.Role.MANAGER, is_active=True)
+    ProjectMembership.objects.create(project=project, user=member, role=ProjectMembership.Role.MEMBER, is_active=True)
+    return project
+
+
+@pytest.fixture()
+def price_units(db):
+    PriceUnit.objects.create(code="USD", name="US Dollar", local_name="دلار آمریکا", symbol="$")
+    PriceUnit.objects.create(code="EUR", name="Euro", local_name="یورو", symbol="€")
+
+
+def test_resolve_rate_uses_workspace_user_rate(workspace, project, member):
+    WorkspaceUserRate.objects.create(
+        workspace=workspace,
+        user=member,
+        hourly_rate=Decimal("40.00"),
+        currency="EUR",
+        effective_from=project.created_at,
+        is_active=True,
+    )
+
+    hourly_rate, currency = resolve_rate(member, project)
+
+    assert hourly_rate == Decimal("40.00")
+    assert currency == "EUR"
+
+
+def test_resolve_rate_falls_back_to_workspace_user_rate(workspace, project, member):
+    WorkspaceUserRate.objects.create(
+        workspace=workspace,
+        user=member,
+        hourly_rate=Decimal("40.00"),
+        currency="EUR",
+        effective_from=project.created_at,
+        is_active=True,
+    )
+
+    hourly_rate, currency = resolve_rate(member, project)
+
+    assert hourly_rate == Decimal("40.00")
+    assert currency == "EUR"
+
+
+def test_admin_can_manage_workspace_user_rates(api_client, admin, member, workspace, price_units):
+    api_client.force_authenticate(user=admin)
+
+    create_response = api_client.post(
+        "/api/workspace-user-rates/",
+        {
+            "workspace_id": str(workspace.id),
+            "user_id": str(member.id),
+            "hourly_rate": "35.50",
+            "currency": "USD",
+        },
+        format="json",
+    )
+
+    assert create_response.status_code == 201
+    rate_id = create_response.data["id"]
+    assert WorkspaceUserRate.objects.filter(id=rate_id, is_deleted=False).exists()
+
+    update_response = api_client.patch(
+        f"/api/workspace-user-rates/{rate_id}/",
+        {"hourly_rate": "42.00"},
+        format="json",
+    )
+    assert update_response.status_code == 200
+    assert update_response.data["hourly_rate"] == "42.00"
+
+    delete_response = api_client.delete(f"/api/workspace-user-rates/{rate_id}/")
+    assert delete_response.status_code == 204
+    assert WorkspaceUserRate.all_objects.get(id=rate_id).is_deleted is True
+
+
+def test_member_cannot_manage_rates(api_client, member, workspace, price_units):
+    api_client.force_authenticate(user=member)
+
+    workspace_response = api_client.post(
+        "/api/workspace-user-rates/",
+        {
+            "workspace_id": str(workspace.id),
+            "user_id": str(member.id),
+            "hourly_rate": "25.00",
+            "currency": "USD",
+        },
+        format="json",
+    )
+
+    assert workspace_response.status_code == 403