Add NixOS module options for deletion requests

nix/module.nix

@@ -250,6 +250,29 @@ let
         '';
       };
 
+      deletionRequestDisrespector = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Archival relay mode that ignores NIP-09 deletion requests.
+          When true, all deletion requests are ignored and events are retained permanently.
+          Prevents "left-pad" scenarios where critical code is deleted from the network.
+          Useful for archival relays that prioritize data preservation.
+        '';
+      };
+
+      archiveRetentionSecs = mkOption {
+        type = types.int;
+        default = 7776000;
+        description = ''
+          Archive retention period in seconds for deleted events and git data.
+          How long to keep archived events and git data before permanent deletion.
+          Default: 7776000 seconds (90 days).
+          Set to lower values for testing (e.g., 60 for 1 minute).
+          Has no effect if deletionRequestDisrespector is true (events never deleted).
+        '';
+      };
+
       user = mkOption {
         type = types.str;
         default = "ngit-grasp-${name}";
@@ -295,6 +318,9 @@ let
       NGIT_REPOSITORY_WHITELIST = concatStringsSep "," cfg.repositoryWhitelist;
       NGIT_REPOSITORY_BLACKLIST = concatStringsSep "," cfg.repositoryBlacklist;
       NGIT_EVENT_BLACKLIST = concatStringsSep "," cfg.eventBlacklist;
+      NGIT_DELETION_REQUEST_DISRESPECTOR =
+        if cfg.deletionRequestDisrespector then "true" else "false";
+      NGIT_ARCHIVE_RETENTION_SECS = toString cfg.archiveRetentionSecs;
       RUST_LOG = cfg.logLevel;
     } // optionalAttrs (cfg.relayName != null) {
       NGIT_RELAY_NAME = cfg.relayName;