Add timely reminder button*

* Add a check in Timely command that removes the reminder button if there already is a timely reminder in DB.
* Add ReminderType in db/models. As well as migrations.
* Set Normal reminders to be of `ReminderType.User`, and Timely reminders to be of `ReminderType.Timely`

src/NadekoBot/Migrations/Postgresql/20230813113832_timely-reminder-type.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace NadekoBot.Db.Migrations
+{
+    /// <inheritdoc />
+    public partial class timelyremindertype : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "type",
+                table: "reminders",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "type",
+                table: "reminders");
+        }
+    }
+}

src/NadekoBot/Migrations/Postgresql/PostgreSqlContextModelSnapshot.cs

@@ -17,7 +17,7 @@ namespace NadekoBot.Db.Migrations
         {
 #pragma warning disable 612, 618
             modelBuilder
-                .HasAnnotation("ProductVersion", "6.0.7")
+                .HasAnnotation("ProductVersion", "7.0.4")
                 .HasAnnotation("Relational:MaxIdentifierLength", 63);
 
             NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
@@ -2212,6 +2212,10 @@ namespace NadekoBot.Db.Migrations
                         .HasColumnType("numeric(20,0)")
                         .HasColumnName("serverid");
 
+                    b.Property<int>("Type")
+                        .HasColumnType("integer")
+                        .HasColumnName("type");
+
                     b.Property<decimal>("UserId")
                         .HasColumnType("numeric(20,0)")
                         .HasColumnName("userid");