feat(ledger): the CSS consumer map — code_shape_consumers edges (shape → file whose markup names the class, count), migration 0086, resolve_consumers (own-file row when the template defines the class, else every other definition), sync_repo_consumers rebuilt from the archive on every refresh, consumers_of; derived, so not backed up (milestone 302 step 2, #2935)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_integration_shape_classify.py

@@ -683,6 +683,49 @@ async def test_derive_new_names_the_copy_that_joined_a_family_since_the_stamp(se
     assert derive_new_summary(rows, since=None)["count"] == 0
 
 
+@pytest.mark.integration
+async def test_consumer_map_syncs_edges_from_template_references(seeded):
+    """Milestone 302: the consumer edges follow the archive — own-file
+    resolution for a scoped class, fan-out to the shared sheet for a class a
+    template does not define, counts refreshed and stale edges removed on
+    the next sync, and a vanished row's edges gone with it."""
+    from scribe.services.shape_ledger import consumers_of, live_rows, sync_repo_consumers
+
+    pid = seeded["pid"]
+    defs = _defs(
+        ("v/A.vue", "css", "error-msg", ".error-msg {", ".error-msg { color: red }"),
+        ("v/B.vue", "css", "error-msg", ".error-msg {", ".error-msg { color: blue }"),
+        ("assets/components.css", "css", "btn-primary", ".btn-primary {", ".btn-primary { x: 1 }"),
+    )
+    await sync_repo_shapes(pid, REPO, defs, seen_marker="m1")
+    refs = {
+        "v/A.vue": {"error-msg": 2, "btn-primary": 1},
+        "v/B.vue": {"error-msg": 1},
+        "v/C.vue": {"error-msg": 1, "btn-primary": 4},
+    }
+    assert await sync_repo_consumers(pid, REPO, refs) == 5
+    rows = {(r.path, r.symbol): r.id for r in await live_rows(pid) if r.kind == "css"}
+    edges = await consumers_of(rows.values())
+    view = {(p, s): [(e.path, e.count) for e in edges.get(i, [])] for (p, s), i in rows.items()}
+    assert view[("v/A.vue", "error-msg")] == [("v/A.vue", 2)]
+    assert view[("v/B.vue", "error-msg")] == [("v/B.vue", 1), ("v/C.vue", 1)]
+    assert view[("assets/components.css", "btn-primary")] == [("v/A.vue", 1), ("v/C.vue", 4)]
+    assert view[("web/button.css", "btn")] == []            # the seeded row: no template names it
+
+    # The next tree: C stops using error-msg, A uses btn-primary twice now.
+    refs2 = {"v/A.vue": {"error-msg": 2, "btn-primary": 2}, "v/B.vue": {"error-msg": 1}}
+    assert await sync_repo_consumers(pid, REPO, refs2) == 3
+    edges = await consumers_of(rows.values())
+    assert [(e.path, e.count) for e in edges[rows[("v/B.vue", "error-msg")]]] == [("v/B.vue", 1)]
+    assert [(e.path, e.count) for e in edges[rows[("assets/components.css", "btn-primary")]]] == [("v/A.vue", 2)]
+
+    # B's rule vanishes from the tree → its edges go with the pass.
+    await sync_repo_shapes(pid, REPO, [d for d in defs if d[0] != "v/B.vue"], seen_marker="m2")
+    await sync_repo_consumers(pid, REPO, refs2)
+    edges = await consumers_of(rows.values())
+    assert rows[("v/B.vue", "error-msg")] not in edges
+
+
 # --- #2793: the divergence readout against real rows -------------------------
 
 

tests/test_shape_ledger.py

@@ -433,6 +433,44 @@ def test_compact_row_carries_identity_standing_and_the_proposers_word_only():
         assert noisy not in compact
 
 
+def test_resolve_consumers_prefers_the_own_file_and_fans_out_for_shared_names():
+    """Milestone 302: a class named in a template resolves to that file's
+    OWN row when it defines the class (a scoped rule, consumed by its own
+    markup); otherwise to every other definition of the name — one shared
+    sheet, or all of several (the map fans out rather than guessing)."""
+    from scribe.services.shape_ledger import resolve_consumers
+    css_rows = [
+        (1, "v/A.vue", "error-msg"),        # scoped, defined + used in A
+        (2, "v/B.vue", "error-msg"),        # scoped, defined in B, used in B and C
+        (3, "assets/components.css", "btn-primary"),   # the shared sheet
+        (4, "assets/a.css", "pill"), (5, "assets/b.css", "pill"),  # two shared defs
+        (6, "assets/c.css", "unused"),
+    ]
+    refs = {
+        "v/A.vue": {"error-msg": 2, "btn-primary": 1, "nothing-defined": 1},
+        "v/B.vue": {"error-msg": 1},
+        "v/C.vue": {"error-msg": 1, "pill": 3},
+    }
+    assert resolve_consumers(css_rows, refs) == {
+        (1, "v/A.vue"): 2,            # own row, not B's
+        (3, "v/A.vue"): 1,            # the shared sheet
+        (2, "v/B.vue"): 1,            # own row
+        (2, "v/C.vue"): 1,            # C defines nothing → the other file's row
+        (4, "v/C.vue"): 3, (5, "v/C.vue"): 3,   # ambiguous: both, not a guess
+    }
+    # Unknown tokens and an unreferenced row leave no trace.
+    assert all(sid != 6 for sid, _ in resolve_consumers(css_rows, refs))
+
+
+def test_consumer_edges_table_cascades_with_the_shape():
+    from scribe.models import Base
+    from scribe.models.code_shape import CONSUMER_BASES, CodeShapeConsumer
+    assert "code_shape_consumers" in Base.metadata.tables
+    cols = CodeShapeConsumer.__table__.c
+    assert next(iter(cols.shape_id.foreign_keys)).ondelete == "CASCADE"
+    assert CONSUMER_BASES == ("template",)
+
+
 def test_uses_edges_table_and_validation():
     """#2870: consumption is its own relation — a table that cascades with
     both ends, and `uses` on a classification must be a list of ids."""