Hi

src/NadekoBot/Migrations/MigrationQueries.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace NadekoBot.Migrations;
+
+public static class MigrationQueries
+{
+    public static void MigrateRero(MigrationBuilder migrationBuilder)
+    {
+        if (migrationBuilder.IsMySql())
+        {
+            migrationBuilder.Sql(
+                """
+                    INSERT IGNORE into reactionroles(guildid, channelid, messageid, emote, roleid, `group`, levelreq, dateadded)
+                    select guildid, channelid, messageid, emotename, roleid, exclusive, 0, reactionrolemessage.dateadded
+                    from reactionrole
+                    left join reactionrolemessage on reactionrolemessage.id = reactionrole.reactionrolemessageid
+                    left join guildconfigs on reactionrolemessage.guildconfigid = guildconfigs.id;
+                    """);
+        }
+        else if (migrationBuilder.IsSqlite())
+        {
+            migrationBuilder.Sql(
+                """
+                    insert or ignore into reactionroles(guildid, channelid, messageid, emote, roleid, 'group', levelreq, dateadded)
+                    select guildid, channelid, messageid, emotename, roleid, exclusive, 0, reactionrolemessage.dateadded
+                    from reactionrole
+                    left join reactionrolemessage on reactionrolemessage.id = reactionrole.reactionrolemessageid
+                    left join guildconfigs on reactionrolemessage.guildconfigid = guildconfigs.id;
+                    """);
+        }
+        else if (migrationBuilder.IsNpgsql())
+        {
+            migrationBuilder.Sql("""
+                insert into reactionroles(guildid, channelid, messageid, emote, roleid, "group", levelreq, dateadded)
+                            select guildid, channelid, messageid, emotename, roleid, exclusive::int, 0, reactionrolemessage.dateadded
+                                from reactionrole
+                                left join reactionrolemessage on reactionrolemessage.id = reactionrole.reactionrolemessageid
+                            left join guildconfigs on reactionrolemessage.guildconfigid = guildconfigs.id
+                            ON CONFLICT DO NOTHING;
+                """);
+        }
+        else
+        {
+            throw new NotSupportedException("This database provider doesn't have an implementation for MigrateRero");
+        }
+    }
+}