- Database namespace is now NadekoBot.Db

- Db related code is now in src/NadekoBot/Db
- Finished major part of the db refactor, but many optimizations are left to be made

src/NadekoBot/Db/Extensions/CustomReactionsExtensions.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.Linq;
+using LinqToDB;
+using NadekoBot.Core.Services.Database.Models;
+
+namespace NadekoBot.Db
+{
+    public static class CustomReactionsExtensions
+    {
+        public static int ClearFromGuild(this DbSet<CustomReaction> crs, ulong guildId)
+        {
+            return crs.Delete(x => x.GuildId == guildId);
+        }
+
+        public static IEnumerable<CustomReaction> ForId(this DbSet<CustomReaction> crs, ulong id)
+        {
+            return crs
+                .AsNoTracking()
+                .AsQueryable()
+                .Where(x => x.GuildId == id)
+                .ToArray();
+        }
+
+        public static CustomReaction GetByGuildIdAndInput(this DbSet<CustomReaction> crs, ulong? guildId, string input)
+        {
+            return crs.FirstOrDefault(x => x.GuildId == guildId && x.Trigger.ToUpper() == input);
+        }
+    }
+}