feat(clients): add clients app basic structure and endpoints

apps/clients/models.py

@@ -0,0 +1,34 @@
+from django.db import models
+from apps.workspaces.models import Workspace
+
+from core.models.base import BaseModel
+
+
+class Client(BaseModel):
+    workspace = models.ForeignKey(
+        Workspace,
+        on_delete=models.CASCADE,
+        related_name="clients",
+    )
+
+    name = models.CharField(max_length=255)
+
+    notes = models.TextField(blank=True)
+
+    class Meta:
+        db_table = "client"
+        ordering = ("-updated_at", "-created_at")
+        indexes = [
+            models.Index(fields=["id"], name="client_id_idx"),
+            models.Index(fields=["workspace"], name="client_workspace_idx"),
+        ]
+        constraints = [
+            models.UniqueConstraint(
+                fields=["workspace", "name"],
+                name="unique_client_name_per_workspace",
+                condition=models.Q(is_deleted=False),
+            )
+        ]
+
+    def __str__(self):
+        return self.name