OP#188 add env file

templates/prune.env.erb

@@ -0,0 +1,20 @@
+# /opt/prometheus-prune/prune.env
+
+# PostgreSQL connection
+PGHOST=<%= @ps_pg_host %>
+PGPORT=<%= @ps_pg_port %>
+PGDATABASE=<%= @ps_pg_db %>
+PGUSER=<%= @ps_pg_user %>
+PGPASSWORD=<%= @ps_pg_pass %>
+
+# Dry-run mode (true = just log, false = actually delete)
+DRY_RUN=<%= @ps_dry_run %>
+
+# Minimum block age in hours before pruning
+MIN_AGE_HOURS=<%= @ps_min_age_hours %>
+
+# Grace period in hours to be extra safe
+GRACE_HOURS=<%= @ps_grace_hours %>
+
+# SQL template to check if block exists in PostgreSQL
+CHECK_SQL_TEMPLATE="SELECT 1 FROM metric_values WHERE metric_time >= to_timestamp({min}/1000.0) AND metric_time <= to_timestamp({max}/1000.0) LIMIT 1;"