fix repeatable migrations

db/routines/R__047_fn_telemetry_ev_charger_sample.sql

@@ -0,0 +1,35 @@
+create or replace function ems.fn_telemetry_ev_charger_sample(
+  p_site_id int,
+  p_charger_id int,
+  p_measured_at timestamptz,
+  p_connector_id int,
+  p_status text,
+  p_power_w int,
+  p_energy_kwh double precision
+)
+returns void
+language sql
+as $fn$
+  insert into ems.telemetry_ev_charger (
+    site_id,
+    charger_id,
+    measured_at,
+    connector_id,
+    status,
+    power_w,
+    energy_kwh
+  )
+  values (
+    p_site_id,
+    p_charger_id,
+    p_measured_at,
+    p_connector_id,
+    p_status,
+    p_power_w,
+    p_energy_kwh
+  )
+  on conflict (charger_id, connector_id, measured_at) do nothing;
+$fn$;
+
+comment on function ems.fn_telemetry_ev_charger_sample is
+  'Insert telemetrie nabíječky EV (placeholder Modbus).';