first commit

backend/app/services/catalog.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from app.core_settings import AppSettings, get_settings
+from app.models.definitions import MetricDefinition
+
+
+@dataclass
+class MetricCatalog:
+    settings: AppSettings
+
+    def get(self, metric_id: str) -> MetricDefinition:
+        if metric_id not in self.settings.metrics:
+            raise KeyError(f"Unknown metric: {metric_id}")
+        return self.settings.metrics[metric_id]
+
+    def safe_get(self, metric_id: str) -> MetricDefinition | None:
+        return self.settings.metrics.get(metric_id)
+
+    def visible_entities(self) -> list[MetricDefinition]:
+        return [self.get(metric_id) for metric_id in self.settings.visible_entity_table if metric_id in self.settings.metrics]
+
+
+
+def get_catalog() -> MetricCatalog:
+    return MetricCatalog(get_settings())