Canonical TSAPI series DB schema v1.0.0

Single source of truth for the timeseries PostgreSQL schema shared by the
Python (TSAPI_SERIESDB_PG_PY) and C++ (TSAPI_POSTGRES_CPP) libraries. SQL
seeded byte-for-byte from TSAPI_SERIESDB_PG_PY/tsapi_pgdb/sql on 2026-09-02.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sql/06_triggers.sql

@@ -0,0 +1,37 @@
+-- Triggers and event triggers
+-- Generated: 2025-10-15T12:24:56.582392
+
+-- Event triggers
+-- Event trigger: prevent_series_drops
+CREATE OR REPLACE FUNCTION meta.prevent_direct_drop()
+ RETURNS event_trigger
+ LANGUAGE plpgsql
+AS $function$
+DECLARE
+    obj record;
+BEGIN
+    -- Get the current context
+    IF current_setting('application.dropping_series', true) = 'true' THEN
+        -- Allow the drop if it's coming from our procedures
+        RETURN;
+    END IF;
+
+    FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects()
+    WHERE object_type = 'table'
+    LOOP
+        IF EXISTS (
+            SELECT 1 FROM meta.series
+            WHERE table_name = obj.object_name
+            AND db_schema = obj.schema_name
+        ) THEN
+            RAISE EXCEPTION 'Table %.% is registered in series and can only be dropped using TimeseriesDB.drop_series()',
+                obj.schema_name, obj.object_name;
+        END IF;
+    END LOOP;
+END;
+$function$;
+
+
+CREATE EVENT TRIGGER prevent_series_drops
+  ON sql_drop
+  EXECUTE FUNCTION meta.prevent_direct_drop();