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diff --git a/tests/conftest.py b/tests/conftest.py
index 4894da3..f404fc9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -24,6 +24,8 @@ import app.models.task  # noqa: F401
 import app.models.role_permission  # noqa: F401
 import app.models.activity  # noqa: F401
 import app.models.propose  # noqa: F401
+import app.models.essential  # noqa: F401
+import app.models.proposal  # noqa: F401
 try:
     import app.models.apikey  # noqa: F401
 except ImportError:
diff --git a/tests/test_propose.py b/tests/test_propose.py
index 97469e2..ca7b0c9 100644
--- a/tests/test_propose.py
+++ b/tests/test_propose.py
@@ -1,15 +1,16 @@
-"""P13.3 — Propose backend tests.
+"""Proposal backend tests (renamed from Propose).
 
 Covers:
 - CRUD: create, list, get, update
 - propose_code per-project incrementing
-- accept → auto-generate feature story task + feat_task_id
+- accept → auto-generate story tasks from Essentials (feat_task_id deprecated per BE-PR-010)
 - accept with non-open milestone → fail
 - reject → status change
 - rejected → reopen back to open
-- feat_task_id cannot be set manually
-- edit restrictions (only open proposes editable)
+- feat_task_id cannot be set manually (deprecated, read-only)
+- edit restrictions (only open proposals editable)
 - permission checks for accept/reject/reopen
+- Legacy /proposes endpoint still works
 """
 import pytest
 from app.models.milestone import MilestoneStatus
@@ -20,19 +21,47 @@ from app.models.task import TaskStatus
 # Helpers
 # ---------------------------------------------------------------------------
 
-def _propose_url(project_id: int, propose_id: int | None = None) -> str:
+def _proposal_url(project_id: int, proposal_id: int | None = None) -> str:
+    """Canonical /proposals URL."""
+    base = f"/projects/{project_id}/proposals"
+    return f"{base}/{proposal_id}" if proposal_id else base
+
+
+def _legacy_propose_url(project_id: int, propose_id: int | None = None) -> str:
+    """Legacy /proposes URL for backward-compat tests."""
     base = f"/projects/{project_id}/proposes"
     return f"{base}/{propose_id}" if propose_id else base
 
 
+def _essential_url(project_id: int, proposal_id: int) -> str:
+    """Essential CRUD URL under a Proposal."""
+    return f"/projects/{project_id}/proposals/{proposal_id}/essentials"
+
+
+def _add_essential(client, project_id: int, proposal_id: int, headers, *,
+                   title: str = "Default Essential", type: str = "feature",
+                   description: str | None = None) -> dict:
+    """Helper: create an Essential under a Proposal (required for accept)."""
+    body = {"title": title, "type": type}
+    if description:
+        body["description"] = description
+    resp = client.post(
+        _essential_url(project_id, proposal_id),
+        json=body,
+        headers=headers,
+    )
+    assert resp.status_code == 201, f"Failed to create essential: {resp.text}"
+    return resp.json()
+
+
 # ===========================================================================
 # CRUD
 # ===========================================================================
 
-class TestProposeCRUD:
+class TestProposalCRUD:
     """Basic create / list / get / update."""
 
-    def test_create_propose(
+    def test_create_proposal(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -41,7 +70,7 @@ class TestProposeCRUD:
         make_member(project.id, user.id, dev_role.id)
 
         resp = client.post(
-            _propose_url(project.id),
+            _proposal_url(project.id),
             json={"title": "New Feature Idea", "description": "Some details"},
             headers=auth_header(user),
         )
@@ -50,9 +79,9 @@ class TestProposeCRUD:
         assert data["title"] == "New Feature Idea"
         assert data["status"] == "open"
         assert data["propose_code"].startswith("PROJ:P")
-        assert data["feat_task_id"] is None
+        assert data["feat_task_id"] is None  # DEPRECATED (BE-PR-010): always None for new proposals
 
-    def test_list_proposes(
+    def test_list_proposals(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -60,15 +89,15 @@ class TestProposeCRUD:
         project = make_project(owner_id=user.id)
         make_member(project.id, user.id, dev_role.id)
 
-        # Create two proposes
-        client.post(_propose_url(project.id), json={"title": "P1"}, headers=auth_header(user))
-        client.post(_propose_url(project.id), json={"title": "P2"}, headers=auth_header(user))
+        # Create two proposals
+        client.post(_proposal_url(project.id), json={"title": "P1"}, headers=auth_header(user))
+        client.post(_proposal_url(project.id), json={"title": "P2"}, headers=auth_header(user))
 
-        resp = client.get(_propose_url(project.id), headers=auth_header(user))
+        resp = client.get(_proposal_url(project.id), headers=auth_header(user))
         assert resp.status_code == 200
         assert len(resp.json()) == 2
 
-    def test_get_propose(
+    def test_get_proposal(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -76,14 +105,14 @@ class TestProposeCRUD:
         project = make_project(owner_id=user.id)
         make_member(project.id, user.id, dev_role.id)
 
-        create_resp = client.post(_propose_url(project.id), json={"title": "P1"}, headers=auth_header(user))
-        propose_id = create_resp.json()["id"]
+        create_resp = client.post(_proposal_url(project.id), json={"title": "P1"}, headers=auth_header(user))
+        proposal_id = create_resp.json()["id"]
 
-        resp = client.get(_propose_url(project.id, propose_id), headers=auth_header(user))
+        resp = client.get(_proposal_url(project.id, proposal_id), headers=auth_header(user))
         assert resp.status_code == 200
         assert resp.json()["title"] == "P1"
 
-    def test_update_propose_open(
+    def test_update_proposal_open(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -91,11 +120,11 @@ class TestProposeCRUD:
         project = make_project(owner_id=user.id)
         make_member(project.id, user.id, dev_role.id)
 
-        create_resp = client.post(_propose_url(project.id), json={"title": "Old"}, headers=auth_header(user))
-        propose_id = create_resp.json()["id"]
+        create_resp = client.post(_proposal_url(project.id), json={"title": "Old"}, headers=auth_header(user))
+        proposal_id = create_resp.json()["id"]
 
         resp = client.patch(
-            _propose_url(project.id, propose_id),
+            _proposal_url(project.id, proposal_id),
             json={"title": "New Title", "description": "Updated"},
             headers=auth_header(user),
         )
@@ -105,11 +134,11 @@ class TestProposeCRUD:
 
 
 # ===========================================================================
-# Propose Code
+# Proposal Code
 # ===========================================================================
 
-class TestProposeCode:
-    """P1.4 — propose_code increments per project independently."""
+class TestProposalCode:
+    """propose_code increments per project independently."""
 
     def test_code_increments_per_project(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
@@ -122,11 +151,11 @@ class TestProposeCode:
         make_member(proj_b.id, user.id, dev_role.id)
 
         # Create 2 in ALPHA
-        r1 = client.post(_propose_url(proj_a.id), json={"title": "A1"}, headers=auth_header(user))
-        r2 = client.post(_propose_url(proj_a.id), json={"title": "A2"}, headers=auth_header(user))
+        r1 = client.post(_proposal_url(proj_a.id), json={"title": "A1"}, headers=auth_header(user))
+        r2 = client.post(_proposal_url(proj_a.id), json={"title": "A2"}, headers=auth_header(user))
 
         # Create 1 in BETA
-        r3 = client.post(_propose_url(proj_b.id), json={"title": "B1"}, headers=auth_header(user))
+        r3 = client.post(_proposal_url(proj_b.id), json={"title": "B1"}, headers=auth_header(user))
 
         code1 = r1.json()["propose_code"]
         code2 = r2.json()["propose_code"]
@@ -144,7 +173,7 @@ class TestProposeCode:
 # ===========================================================================
 
 class TestAccept:
-    """P6.2 — accept propose → create feature story task."""
+    """accept proposal → create feature story task."""
 
     def test_accept_success(
         self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
@@ -157,33 +186,30 @@ class TestAccept:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)
 
         create_resp = client.post(
-            _propose_url(project.id),
+            _proposal_url(project.id),
             json={"title": "Cool Feature", "description": "Do something cool"},
             headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # New accept flow requires at least one Essential (BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr),
+                       title="Cool Feature", type="feature", description="Do something cool")
 
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
         assert resp.status_code == 200
         data = resp.json()
         assert data["status"] == "accepted"
-        assert data["feat_task_id"] is not None
+        # BE-PR-010: feat_task_id is no longer written by new accept flow
+        assert data["feat_task_id"] is None
 
-        # Verify the generated task exists
-        from app.models.task import Task
-        task = db.query(Task).filter(Task.id == int(data["feat_task_id"])).first()
-        assert task is not None
-        assert task.title == "Cool Feature"
-        assert task.description == "Do something cool"
-        assert task.task_type == "story"
-        assert task.task_subtype == "feature"
-        task_status = task.status.value if hasattr(task.status, "value") else task.status
-        assert task_status == "pending"
-        assert task.milestone_id == ms.id
+        # Tasks are tracked via generated_tasks (source_proposal_id)
+        assert "generated_tasks" in data
+        assert len(data["generated_tasks"]) >= 1
 
     def test_accept_non_open_milestone_fails(
         self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
@@ -196,14 +222,17 @@ class TestAccept:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.FREEZE)
 
         create_resp = client.post(
-            _propose_url(project.id),
+            _proposal_url(project.id),
             json={"title": "Feature X"},
             headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr))
 
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
@@ -221,28 +250,36 @@ class TestAccept:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr))
 
         # First accept
         client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
 
         # Second accept should fail
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
         assert resp.status_code == 400
 
-    def test_accept_auto_fills_feat_task_id(
+    def test_accept_does_not_write_feat_task_id(
         self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
     ):
+        """BE-PR-010: new accept flow does NOT populate feat_task_id.
+
+        feat_task_id is deprecated; tasks are now tracked via
+        Task.source_proposal_id / source_essential_id.
+        """
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
         mgr = make_user()
         project = make_project(owner_id=mgr.id)
@@ -251,21 +288,25 @@ class TestAccept:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr))
 
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
         data = resp.json()
-        assert data["feat_task_id"] is not None
+        # feat_task_id should remain None — deprecated field
+        assert data["feat_task_id"] is None
 
         # Re-fetch to confirm persistence
-        get_resp = client.get(_propose_url(project.id, propose_id), headers=auth_header(mgr))
-        assert get_resp.json()["feat_task_id"] == data["feat_task_id"]
+        get_resp = client.get(_proposal_url(project.id, proposal_id), headers=auth_header(mgr))
+        assert get_resp.json()["feat_task_id"] is None
 
     def test_accept_no_permission_fails(
         self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
@@ -280,15 +321,18 @@ class TestAccept:
 
         ms = make_milestone(project.id, owner.id, status=MilestoneStatus.OPEN)
 
-        # Dev creates the propose
+        # Dev creates the proposal
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(dev_user))
 
         # Dev tries to accept — should fail
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(dev_user),
         )
@@ -300,7 +344,7 @@ class TestAccept:
 # ===========================================================================
 
 class TestReject:
-    """P6.3 — reject propose."""
+    """reject proposal."""
 
     def test_reject_success(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
@@ -311,12 +355,12 @@ class TestReject:
         make_member(project.id, mgr.id, mgr_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "Not needed"},
             headers=auth_header(mgr),
         )
@@ -334,20 +378,23 @@ class TestReject:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr))
 
         # Accept first
         client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
 
         # Now reject should fail
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "Changed mind"},
             headers=auth_header(mgr),
         )
@@ -364,12 +411,12 @@ class TestReject:
         make_member(project.id, dev_user.id, dev_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "nah"},
             headers=auth_header(dev_user),
         )
@@ -381,7 +428,7 @@ class TestReject:
 # ===========================================================================
 
 class TestReopen:
-    """P6.4 — reopen rejected propose."""
+    """reopen rejected proposal."""
 
     def test_reopen_success(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
@@ -392,20 +439,20 @@ class TestReopen:
         make_member(project.id, mgr.id, mgr_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         # Reject first
         client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "wait"},
             headers=auth_header(mgr),
         )
 
         # Reopen
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reopen",
+            _proposal_url(project.id, proposal_id) + "/reopen",
             headers=auth_header(mgr),
         )
         assert resp.status_code == 200
@@ -420,13 +467,13 @@ class TestReopen:
         make_member(project.id, mgr.id, mgr_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
-        # Try reopen on open propose — should fail
+        # Try reopen on open proposal — should fail
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reopen",
+            _proposal_url(project.id, proposal_id) + "/reopen",
             headers=auth_header(mgr),
         )
         assert resp.status_code == 400
@@ -442,31 +489,31 @@ class TestReopen:
         make_member(project.id, dev_user.id, dev_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(dev_user),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         # Owner rejects
         client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "nah"},
             headers=auth_header(owner),
         )
 
         # Dev tries to reopen — should fail
         resp = client.post(
-            _propose_url(project.id, propose_id) + "/reopen",
+            _proposal_url(project.id, proposal_id) + "/reopen",
             headers=auth_header(dev_user),
         )
         assert resp.status_code == 403
 
 
 # ===========================================================================
-# feat_task_id protection
+# feat_task_id protection (DEPRECATED per BE-PR-010)
 # ===========================================================================
 
 class TestFeatTaskIdProtection:
-    """P6.5 — feat_task_id is server-side only, cannot be set by client."""
+    """feat_task_id is deprecated and read-only; cannot be set by client."""
 
     def test_update_cannot_set_feat_task_id(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
@@ -477,18 +524,18 @@ class TestFeatTaskIdProtection:
         make_member(project.id, user.id, dev_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(user),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(user),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         # Try to set feat_task_id via PATCH
         resp = client.patch(
-            _propose_url(project.id, propose_id),
+            _proposal_url(project.id, proposal_id),
             json={"feat_task_id": "999"},
             headers=auth_header(user),
         )
         assert resp.status_code == 200
-        # feat_task_id should still be None (server ignores it)
+        # feat_task_id should still be None — deprecated, read-only (BE-PR-010)
         assert resp.json()["feat_task_id"] is None
 
 
@@ -497,9 +544,9 @@ class TestFeatTaskIdProtection:
 # ===========================================================================
 
 class TestEditRestrictions:
-    """Propose editing is only allowed in open status."""
+    """Proposal editing is only allowed in open status."""
 
-    def test_edit_accepted_propose_fails(
+    def test_edit_accepted_proposal_fails(
         self, client, db, make_user, make_project, make_milestone, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -510,27 +557,30 @@ class TestEditRestrictions:
         ms = make_milestone(project.id, mgr.id, status=MilestoneStatus.OPEN)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
+
+        # Add Essential (required for accept per BE-PR-007)
+        _add_essential(client, project.id, proposal_id, auth_header(mgr))
 
         # Accept
         client.post(
-            _propose_url(project.id, propose_id) + "/accept",
+            _proposal_url(project.id, proposal_id) + "/accept",
             json={"milestone_id": ms.id},
             headers=auth_header(mgr),
         )
 
         # Try to edit
         resp = client.patch(
-            _propose_url(project.id, propose_id),
+            _proposal_url(project.id, proposal_id),
             json={"title": "Changed"},
             headers=auth_header(mgr),
         )
         assert resp.status_code == 400
         assert "open" in resp.json()["detail"].lower()
 
-    def test_edit_rejected_propose_fails(
+    def test_edit_rejected_proposal_fails(
         self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
     ):
         admin_role, mgr_role, dev_role = seed_roles_and_permissions
@@ -539,21 +589,79 @@ class TestEditRestrictions:
         make_member(project.id, mgr.id, mgr_role.id)
 
         create_resp = client.post(
-            _propose_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
+            _proposal_url(project.id), json={"title": "F"}, headers=auth_header(mgr),
         )
-        propose_id = create_resp.json()["id"]
+        proposal_id = create_resp.json()["id"]
 
         # Reject
         client.post(
-            _propose_url(project.id, propose_id) + "/reject",
+            _proposal_url(project.id, proposal_id) + "/reject",
             json={"reason": "no"},
             headers=auth_header(mgr),
         )
 
         # Try to edit
         resp = client.patch(
-            _propose_url(project.id, propose_id),
+            _proposal_url(project.id, proposal_id),
             json={"title": "Changed"},
             headers=auth_header(mgr),
         )
         assert resp.status_code == 400
+
+
+# ===========================================================================
+# Legacy /proposes endpoint backward compatibility
+# ===========================================================================
+
+class TestLegacyProposeEndpoint:
+    """Verify the old /proposes URL still works."""
+
+    def test_legacy_create_and_list(
+        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
+    ):
+        admin_role, mgr_role, dev_role = seed_roles_and_permissions
+        user = make_user()
+        project = make_project(owner_id=user.id, project_code="LEG")
+        make_member(project.id, user.id, dev_role.id)
+
+        # Create via legacy endpoint
+        resp = client.post(
+            _legacy_propose_url(project.id),
+            json={"title": "Legacy Proposal"},
+            headers=auth_header(user),
+        )
+        assert resp.status_code == 201
+        assert resp.json()["title"] == "Legacy Proposal"
+
+        # List via legacy endpoint
+        resp = client.get(_legacy_propose_url(project.id), headers=auth_header(user))
+        assert resp.status_code == 200
+        assert len(resp.json()) >= 1
+
+    def test_legacy_get_and_update(
+        self, client, db, make_user, make_project, seed_roles_and_permissions, make_member, auth_header,
+    ):
+        admin_role, mgr_role, dev_role = seed_roles_and_permissions
+        user = make_user()
+        project = make_project(owner_id=user.id)
+        make_member(project.id, user.id, dev_role.id)
+
+        # Create via new endpoint
+        create_resp = client.post(
+            _proposal_url(project.id), json={"title": "Cross"}, headers=auth_header(user),
+        )
+        pid = create_resp.json()["id"]
+
+        # Get via legacy
+        resp = client.get(_legacy_propose_url(project.id, pid), headers=auth_header(user))
+        assert resp.status_code == 200
+        assert resp.json()["title"] == "Cross"
+
+        # Update via legacy
+        resp = client.patch(
+            _legacy_propose_url(project.id, pid),
+            json={"title": "Updated Cross"},
+            headers=auth_header(user),
+        )
+        assert resp.status_code == 200
+        assert resp.json()["title"] == "Updated Cross"