diff --git a/python/ktx-daemon/src/ktx_daemon/semantic_layer.py b/python/ktx-daemon/src/ktx_daemon/semantic_layer.py
index d6c15cd0..e813575e 100644
--- a/python/ktx-daemon/src/ktx_daemon/semantic_layer.py
+++ b/python/ktx-daemon/src/ktx_daemon/semantic_layer.py
@@ -2,18 +2,23 @@
 
 from __future__ import annotations
 
+import time
 from typing import Any
 
-from pydantic import BaseModel, Field
+from ktx_daemon.telemetry import error_class, track_telemetry_event
+from pydantic import BaseModel, ConfigDict, Field
 from semantic_layer.duplicate_check import validate_measure_duplicates
 from semantic_layer.engine import SemanticEngine
 from semantic_layer.models import QueryResult, SourceDefinition
 
 
 class SemanticLayerQueryRequest(BaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+
     sources: list[dict[str, Any]]
     query: dict[str, Any]
     dialect: str = "postgres"
+    project_id: str | None = Field(default=None, alias="projectId")
 
 
 class SemanticLayerQueryResponse(BaseModel):
@@ -79,15 +84,73 @@ def _response_columns(result: QueryResult) -> list[dict[str, Any]]:
 def query_semantic_layer(
     request: SemanticLayerQueryRequest,
 ) -> SemanticLayerQueryResponse:
-    sources = _load_sources(request.sources)
-    engine = SemanticEngine.from_sources(sources, dialect=request.dialect)
-    result = engine.query(request.query)
-    return SemanticLayerQueryResponse(
-        sql=result.sql,
-        dialect=result.dialect,
-        columns=_response_columns(result),
-        plan=result.resolved_plan.model_dump(mode="json"),
-    )
+    started = time.perf_counter()
+    stage = "parse"
+    source_count = 0
+    join_count = 0
+    sql_started = started
+    try:
+        sources = _load_sources(request.sources)
+        source_count = len(sources)
+        join_count = sum(len(source.joins) for source in sources.values())
+        stage = "resolve"
+        engine = SemanticEngine.from_sources(sources, dialect=request.dialect)
+        stage = "compile"
+        sql_started = time.perf_counter()
+        result = engine.query(request.query)
+        stage = "transpile"
+        track_telemetry_event(
+            "sl_plan_completed",
+            {
+                "outcome": "ok",
+                "stage": stage,
+                "durationMs": max(0, (time.perf_counter() - started) * 1000),
+                "sourceCount": source_count,
+                "joinCount": join_count,
+            },
+            project_id=request.project_id,
+        )
+        track_telemetry_event(
+            "sql_gen_completed",
+            {
+                "outcome": "ok",
+                "dialect": result.dialect,
+                "durationMs": max(0, (time.perf_counter() - sql_started) * 1000),
+            },
+            project_id=request.project_id,
+        )
+        return SemanticLayerQueryResponse(
+            sql=result.sql,
+            dialect=result.dialect,
+            columns=_response_columns(result),
+            plan=result.resolved_plan.model_dump(mode="json"),
+        )
+    except Exception as error:
+        klass = error_class(error)
+        fields: dict[str, Any] = {
+            "outcome": "error",
+            "stage": stage,
+            "durationMs": max(0, (time.perf_counter() - started) * 1000),
+            "sourceCount": source_count,
+            "joinCount": join_count,
+        }
+        if klass:
+            fields["errorClass"] = klass
+        track_telemetry_event(
+            "sl_plan_completed", fields, project_id=request.project_id
+        )
+        if stage in {"compile", "transpile"}:
+            sql_fields: dict[str, Any] = {
+                "outcome": "error",
+                "dialect": request.dialect,
+                "durationMs": max(0, (time.perf_counter() - sql_started) * 1000),
+            }
+            if klass:
+                sql_fields["errorClass"] = klass
+            track_telemetry_event(
+                "sql_gen_completed", sql_fields, project_id=request.project_id
+            )
+        raise
 
 
 def validate_semantic_layer(request: ValidateSourcesRequest) -> ValidateSourcesResponse:
diff --git a/python/ktx-daemon/tests/test_semantic_layer.py b/python/ktx-daemon/tests/test_semantic_layer.py
index 7a75c019..9a3f0f6f 100644
--- a/python/ktx-daemon/tests/test_semantic_layer.py
+++ b/python/ktx-daemon/tests/test_semantic_layer.py
@@ -1,5 +1,8 @@
 from __future__ import annotations
 
+import json
+from pathlib import Path
+
 from ktx_daemon.semantic_layer import (
     SemanticLayerQueryRequest,
     ValidateSourcesRequest,
@@ -46,6 +49,49 @@ def test_query_semantic_layer_generates_sql_and_plan() -> None:
     assert response.plan["sources_used"] == ["orders"]
 
 
+def test_query_semantic_layer_emits_plan_and_sql_debug_events(
+    tmp_path: Path,
+    monkeypatch,
+    capsys,
+) -> None:
+    from ktx_daemon.telemetry.identity import reset_identity_cache
+
+    reset_identity_cache()
+    identity_path = tmp_path / ".ktx" / "telemetry.json"
+    identity_path.parent.mkdir(parents=True)
+    identity_path.write_text(
+        json.dumps(
+            {
+                "installId": "00000000-0000-4000-8000-000000000000",
+                "enabled": True,
+                "createdAt": "2026-05-22T14:33:02.000Z",
+            }
+        )
+        + "\n",
+        encoding="utf-8",
+    )
+    monkeypatch.setenv("HOME", str(tmp_path))
+    monkeypatch.setenv("KTX_TELEMETRY_DEBUG", "1")
+
+    query_semantic_layer(
+        SemanticLayerQueryRequest(
+            sources=[ORDERS_SOURCE],
+            dialect="postgres",
+            projectId="a" * 64,
+            query={
+                "measures": ["orders.order_count"],
+                "dimensions": ["orders.status"],
+                "limit": 25,
+            },
+        )
+    )
+
+    captured = capsys.readouterr()
+    assert '"event": "sl_plan_completed"' in captured.err
+    assert '"event": "sql_gen_completed"' in captured.err
+    assert "public.orders" not in captured.err
+
+
 def test_validate_semantic_layer_reports_duplicate_measure_names() -> None:
     invalid_source = {
         **ORDERS_SOURCE,