Add per-system member/group limit override

PluralKit.Core/Database/Database.cs

@@ -19,7 +19,7 @@ namespace PluralKit.Core
     internal class Database: IDatabase
     {
         private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-        private const int TargetSchemaVersion = 9;
+        private const int TargetSchemaVersion = 10;
         
         private readonly CoreConfig _config;
         private readonly ILogger _logger;

PluralKit.Core/Database/Migrations/10.sql

@@ -0,0 +1,11 @@
+-- SCHEMA VERSION 10: 2020-10-09 --
+-- Member/group limit override per-system
+
+alter table systems add column member_limit_override smallint default null;
+alter table systems add column group_limit_override smallint default null;
+
+-- Lowering global limit to 1000 in this commit, so increase it for systems already above that
+update systems s set member_count_override = 1500
+    where (select count(*) from members m where m.system = s.id) > 1000;
+
+update info set schema_version = 10;

PluralKit.Core/Models/PKSystem.cs

@@ -23,6 +23,8 @@ namespace PluralKit.Core {
         public PrivacyLevel FrontPrivacy { get; }
         public PrivacyLevel FrontHistoryPrivacy { get; }
         public PrivacyLevel GroupListPrivacy { get; }
+        public int? MemberLimitOverride { get; }
+        public int? GroupLimitOverride { get; }
         
         [JsonIgnore] public DateTimeZone Zone => DateTimeZoneProviders.Tzdb.GetZoneOrNull(UiTz);
     }

PluralKit.Core/Utils/Limits.cs

@@ -5,7 +5,7 @@ namespace PluralKit.Core {
 
         public static readonly int MaxSystemNameLength = 100;
         public static readonly int MaxSystemTagLength = MaxProxyNameLength - 1;
-        public static readonly int MaxMemberCount = 1500;
+        public static readonly int MaxMemberCount = 1000;
         public static readonly int MaxMembersWarnThreshold = MaxMemberCount - 50;
         public static readonly int MaxGroupCount = 250;
         public static readonly int MaxDescriptionLength = 1000;