feat: rewrite database schema for localized autoproxy

PluralKit.Core/Database/Functions/MessageContext.cs

@@ -15,10 +15,6 @@ public class MessageContext
     public bool InLogBlacklist { get; }
     public bool LogCleanupEnabled { get; }
     public bool ProxyEnabled { get; }
-    public AutoproxyMode AutoproxyMode { get; }
-    public MemberId? AutoproxyMember { get; }
-    public ulong? LastMessage { get; }
-    public MemberId? LastMessageMember { get; }
     public SwitchId? LastSwitch { get; }
     public MemberId[] LastSwitchMembers { get; } = new MemberId[0];
     public Instant? LastSwitchTimestamp { get; }

PluralKit.Core/Database/Functions/functions.sql

@@ -6,10 +6,6 @@
         in_log_blacklist bool,
         log_cleanup_enabled bool,
         proxy_enabled bool,
-        autoproxy_mode int,
-        autoproxy_member int,
-        last_message bigint,
-        last_message_member int,
         last_switch int,
         last_switch_members int[],
         last_switch_timestamp timestamp,
@@ -28,8 +24,7 @@ as $$
             left join system_config on system_config.system = accounts.system
             left join system_guild on system_guild.system = accounts.system and system_guild.guild = guild_id
             where accounts.uid = account_id),
-        guild as (select * from servers where id = guild_id),
-        last_message as (select * from messages where messages.guild = guild_id and messages.sender = account_id order by mid desc limit 1)
+        guild as (select * from servers where id = guild_id)
     select
         system.id as system_id,
         guild.log_channel,
@@ -37,10 +32,6 @@ as $$
         (channel_id = any(guild.log_blacklist)) as in_log_blacklist,
         coalesce(guild.log_cleanup_enabled, false),
         coalesce(system_guild.proxy_enabled, true) as proxy_enabled,
-        coalesce(system_guild.autoproxy_mode, 1) as autoproxy_mode,
-        system_guild.autoproxy_member,
-        last_message.mid as last_message,
-        last_message.member as last_message_member,
         system_last_switch.switch as last_switch,
         system_last_switch.members as last_switch_members,
         system_last_switch.timestamp as last_switch_timestamp,
@@ -55,7 +46,6 @@ as $$
     from (select 1) as _placeholder
         left join system on true
         left join guild on true
-        left join last_message on true
         left join system_last_switch on system_last_switch.system = system.id
         left join system_guild on system_guild.system = system.id and system_guild.guild = guild_id
 $$ language sql stable rows 1;

PluralKit.Core/Database/Migrations/27.sql

@@ -0,0 +1,36 @@
+-- schema version 27
+-- autoproxy locations
+
+-- mode pseudo-enum: (copied from 3.sql)
+-- 1 = autoproxy off
+-- 2 = front mode (first fronter)
+-- 3 = latch mode (last proxyer)
+-- 4 = member mode (specific member)
+
+create table autoproxy (
+    system int references systems(id) on delete cascade,
+    channel_id bigint,
+    guild_id bigint,
+    autoproxy_mode int check (mode in (1, 2, 3, 4)) not null default 1,
+    autoproxy_member int references members(id) on delete set null,
+    last_latch_timestamp timestamp,
+    check (
+        (channel_id  = 0 and guild_id  = 0)
+     or (channel_id != 0 and guild_id  = 0)
+     or (channel_id  = 0 and guild_id != 0)
+    ),
+    primary key (system, channel_id, guild_id)
+);
+
+insert into autoproxy select
+    system,
+    0 as channel_id,
+    guild as guild_id,
+    autoproxy_mode,
+    autoproxy_member
+from system_guild;
+
+alter table system_guild drop column autoproxy_mode;
+alter table system_guild drop column autoproxy_member;
+
+update info set schema_version = 27;

PluralKit.Core/Database/Repository/ModelRepository.Autoproxy.cs

@@ -0,0 +1,35 @@
+using Dapper;
+
+using SqlKata;
+
+namespace PluralKit.Core;
+
+public partial class ModelRepository
+{
+    public async Task UpdateAutoproxy(SystemId system, ulong? guildId, ulong? channelId, AutoproxyPatch patch)
+    {
+        var locationStr = guildId != null ? "guild" : (channelId != null ? "channel" : "global");
+        _logger.Information("Updated autoproxy for {SystemId} in location {location}: {@AutoproxyPatch}", system, locationStr, patch);
+
+        var query = patch.Apply(new Query("autoproxy")
+            .Where("system", system)
+            .Where("guild_id", guildId ?? 0)
+            .Where("channel_id", channelId ?? 0)
+        );
+        _ = _dispatch.Dispatch(system, guildId, channelId, patch);
+        await _db.ExecuteQuery(query);
+    }
+
+    // todo: this might break with differently scoped autoproxy
+    public async Task<AutoproxySettings> GetAutoproxySettings(SystemId system, ulong? guildId, ulong? channelId)
+        => await _db.QueryFirst<AutoproxySettings>(new Query("autoproxy").AsInsert(new {
+            system = system,
+            guild_id = guildId ?? 0,
+            channel_id = channelId ?? 0,
+        })
+            .Where("system", system)
+            .Where("guild_id", guildId ?? 0)
+            .Where("channel_id", channelId ?? 0),
+            "on conflict (system, guild_id, channel_id) do update set system = $1 returning *"
+        );
+}

PluralKit.Core/Database/Utils/DatabaseMigrator.cs

@@ -9,7 +9,7 @@ namespace PluralKit.Core;
 internal class DatabaseMigrator
 {
     private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-    private const int TargetSchemaVersion = 26;
+    private const int TargetSchemaVersion = 27;
     private readonly ILogger _logger;
 
     public DatabaseMigrator(ILogger logger)