Add migrations for heartbeats

src/Tgstation.Server.Host/Database/Migrations/20200511005957_MSAddHeartbeat.Designer.cs

@@ -0,0 +1,833 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	[DbContext(typeof(SqlServerDatabaseContext))]
+	[Migration("20200511005957_MSAddHeartbeat")]
+	partial class MSAddHeartbeat
+	{
+		/// <inheritdoc />
+		protected override void BuildTargetModel(ModelBuilder modelBuilder)
+		{
+#pragma warning disable 612, 618
+			modelBuilder
+				.HasAnnotation("ProductVersion", "3.1.3")
+				.HasAnnotation("Relational:MaxIdentifierLength", 128)
+				.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<int>("ChannelLimit")
+						.HasColumnType("int");
+
+					b.Property<string>("ConnectionString")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Enabled")
+						.HasColumnType("bit");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("nvarchar(100)")
+						.HasMaxLength(100);
+
+					b.Property<int>("Provider")
+						.HasColumnType("int");
+
+					b.Property<long>("ReconnectionInterval")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "Name")
+						.IsUnique();
+
+					b.ToTable("ChatBots");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<long>("ChatSettingsId")
+						.HasColumnType("bigint");
+
+					b.Property<decimal?>("DiscordChannelId")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<string>("IrcChannel")
+						.HasColumnType("nvarchar(100)")
+						.HasMaxLength(100);
+
+					b.Property<bool?>("IsAdminChannel")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("IsUpdatesChannel")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("IsWatchdogChannel")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<string>("Tag")
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("ChatSettingsId", "DiscordChannelId")
+						.IsUnique()
+						.HasFilter("[DiscordChannelId] IS NOT NULL");
+
+					b.HasIndex("ChatSettingsId", "IrcChannel")
+						.IsUnique()
+						.HasFilter("[IrcChannel] IS NOT NULL");
+
+					b.ToTable("ChatChannels");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("ByondVersion")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<int?>("DMApiMajorVersion")
+						.HasColumnType("int");
+
+					b.Property<int?>("DMApiMinorVersion")
+						.HasColumnType("int");
+
+					b.Property<int?>("DMApiPatchVersion")
+						.HasColumnType("int");
+
+					b.Property<Guid?>("DirectoryName")
+						.IsRequired()
+						.HasColumnType("uniqueidentifier");
+
+					b.Property<string>("DmeName")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<long>("JobId")
+						.HasColumnType("bigint");
+
+					b.Property<int>("MinimumSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<string>("Output")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("DirectoryName");
+
+					b.HasIndex("JobId")
+						.IsUnique();
+
+					b.HasIndex("RevisionInformationId");
+
+					b.ToTable("CompileJobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<bool?>("AllowWebClient")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("AutoStart")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<long>("HeartbeatSeconds")
+						.HasColumnType("bigint");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<int>("PrimaryPort")
+						.HasColumnType("int");
+
+					b.Property<int?>("ProcessId")
+						.HasColumnType("int");
+
+					b.Property<int>("SecondaryPort")
+						.HasColumnType("int");
+
+					b.Property<int>("SecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<bool?>("SoftRestart")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("SoftShutdown")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<long>("StartupTimeout")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamDaemonSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<int>("ApiValidationPort")
+						.HasColumnType("int");
+
+					b.Property<int>("ApiValidationSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("ProjectName")
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamMakerSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Instance", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<long>("AutoUpdateInterval")
+						.HasColumnType("bigint");
+
+					b.Property<int>("ChatBotLimit")
+						.HasColumnType("int");
+
+					b.Property<int>("ConfigurationType")
+						.HasColumnType("int");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Online")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<string>("Path")
+						.IsRequired()
+						.HasColumnType("nvarchar(450)");
+
+					b.HasKey("Id");
+
+					b.HasIndex("Path")
+						.IsUnique();
+
+					b.ToTable("Instances");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<decimal>("ByondRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal>("ChatBotRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal>("ConfigurationRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal>("DreamDaemonRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal>("DreamMakerRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<decimal>("InstanceUserRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal>("RepositoryRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<long?>("UserId")
+						.IsRequired()
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("UserId", "InstanceId")
+						.IsUnique();
+
+					b.ToTable("InstanceUsers");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<decimal?>("CancelRight")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<decimal?>("CancelRightsType")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<bool?>("Cancelled")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<long?>("CancelledById")
+						.HasColumnType("bigint");
+
+					b.Property<string>("Description")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<long?>("ErrorCode")
+						.HasColumnType("bigint");
+
+					b.Property<string>("ExceptionDetails")
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<DateTimeOffset?>("StartedAt")
+						.IsRequired()
+						.HasColumnType("datetimeoffset");
+
+					b.Property<long>("StartedById")
+						.HasColumnType("bigint");
+
+					b.Property<DateTimeOffset?>("StoppedAt")
+						.HasColumnType("datetimeoffset");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CancelledById");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("StartedById");
+
+					b.ToTable("Jobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("AccessIdentifier")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<long>("CompileJobId")
+						.HasColumnType("bigint");
+
+					b.Property<bool>("IsPrimary")
+						.HasColumnType("bit");
+
+					b.Property<int>("LaunchSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<int>("Port")
+						.HasColumnType("int");
+
+					b.Property<int>("ProcessId")
+						.HasColumnType("int");
+
+					b.Property<int>("RebootState")
+						.HasColumnType("int");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CompileJobId");
+
+					b.ToTable("ReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<string>("AccessUser")
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("AutoUpdatesKeepTestMerges")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("AutoUpdatesSynchronize")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<string>("CommitterEmail")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<string>("CommitterName")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<bool?>("PostTestMergeComment")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("PushTestMergeCommits")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<bool?>("ShowTestMergeCommitters")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("RepositorySettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("bigint");
+
+					b.Property<long>("TestMergeId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("RevisionInformationId");
+
+					b.HasIndex("TestMergeId");
+
+					b.ToTable("RevInfoTestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("CommitSha")
+						.IsRequired()
+						.HasColumnType("nvarchar(40)")
+						.HasMaxLength(40);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("OriginCommitSha")
+						.IsRequired()
+						.HasColumnType("nvarchar(40)")
+						.HasMaxLength(40);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "CommitSha")
+						.IsUnique();
+
+					b.ToTable("RevisionInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<string>("Author")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<string>("BodyAtMerge")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<string>("Comment")
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<DateTimeOffset>("MergedAt")
+						.HasColumnType("datetimeoffset");
+
+					b.Property<long>("MergedById")
+						.HasColumnType("bigint");
+
+					b.Property<int>("Number")
+						.HasColumnType("int");
+
+					b.Property<long?>("PrimaryRevisionInformationId")
+						.IsRequired()
+						.HasColumnType("bigint");
+
+					b.Property<string>("PullRequestRevision")
+						.IsRequired()
+						.HasColumnType("nvarchar(40)")
+						.HasMaxLength(40);
+
+					b.Property<string>("TitleAtMerge")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<string>("Url")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)");
+
+					b.HasKey("Id");
+
+					b.HasIndex("MergedById");
+
+					b.HasIndex("PrimaryRevisionInformationId")
+						.IsUnique();
+
+					b.ToTable("TestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.Property<long?>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<decimal>("AdministrationRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<string>("CanonicalName")
+						.IsRequired()
+						.HasColumnType("nvarchar(450)");
+
+					b.Property<DateTimeOffset?>("CreatedAt")
+						.IsRequired()
+						.HasColumnType("datetimeoffset");
+
+					b.Property<long?>("CreatedById")
+						.HasColumnType("bigint");
+
+					b.Property<bool?>("Enabled")
+						.IsRequired()
+						.HasColumnType("bit");
+
+					b.Property<decimal>("InstanceManagerRights")
+						.HasColumnType("decimal(20,0)");
+
+					b.Property<DateTimeOffset?>("LastPasswordUpdate")
+						.HasColumnType("datetimeoffset");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("nvarchar(max)")
+						.HasMaxLength(10000);
+
+					b.Property<string>("PasswordHash")
+						.HasColumnType("nvarchar(max)");
+
+					b.Property<string>("SystemIdentifier")
+						.HasColumnType("nvarchar(450)");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CanonicalName")
+						.IsUnique();
+
+					b.HasIndex("CreatedById");
+
+					b.HasIndex("SystemIdentifier")
+						.IsUnique()
+						.HasFilter("[SystemIdentifier] IS NOT NULL");
+
+					b.ToTable("Users");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint")
+						.HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);
+
+					b.Property<long?>("AlphaId")
+						.HasColumnType("bigint");
+
+					b.Property<bool>("AlphaIsActive")
+						.HasColumnType("bit");
+
+					b.Property<long?>("BravoId")
+						.HasColumnType("bigint");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("AlphaId");
+
+					b.HasIndex("BravoId");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("WatchdogReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("ChatSettings")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ChatBot", "ChatSettings")
+						.WithMany("Channels")
+						.HasForeignKey("ChatSettingsId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Job", "Job")
+						.WithOne()
+						.HasForeignKey("Tgstation.Server.Host.Models.CompileJob", "JobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("CompileJobs")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamDaemonSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamDaemonSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamMakerSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamMakerSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("InstanceUsers")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", null)
+						.WithMany("InstanceUsers")
+						.HasForeignKey("UserId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CancelledBy")
+						.WithMany()
+						.HasForeignKey("CancelledById");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("Jobs")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", "StartedBy")
+						.WithMany()
+						.HasForeignKey("StartedById")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.CompileJob", "CompileJob")
+						.WithMany()
+						.HasForeignKey("CompileJobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("RepositorySettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.RepositorySettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("ActiveTestMerges")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.TestMerge", "TestMerge")
+						.WithMany("RevisonInformations")
+						.HasForeignKey("TestMergeId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("RevisionInformations")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "MergedBy")
+						.WithMany("TestMerges")
+						.HasForeignKey("MergedById")
+						.OnDelete(DeleteBehavior.Restrict)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "PrimaryRevisionInformation")
+						.WithOne("PrimaryTestMerge")
+						.HasForeignKey("Tgstation.Server.Host.Models.TestMerge", "PrimaryRevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CreatedBy")
+						.WithMany("CreatedUsers")
+						.HasForeignKey("CreatedById");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Alpha")
+						.WithMany()
+						.HasForeignKey("AlphaId");
+
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Bravo")
+						.WithMany()
+						.HasForeignKey("BravoId");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", null)
+						.WithOne("WatchdogReattachInformation")
+						.HasForeignKey("Tgstation.Server.Host.Models.WatchdogReattachInformation", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+#pragma warning restore 612, 618
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/20200511005957_MSAddHeartbeat.cs

@@ -0,0 +1,35 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using System;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	/// <summary>
+	/// Add heartbeat support for MSSQL.
+	/// </summary>
+	public partial class MSAddHeartbeat : Migration
+	{
+		/// <inheritdoc />
+		protected override void Up(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.AddColumn<long>(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings",
+				nullable: false,
+				defaultValue: 0L);
+		}
+
+		/// <inheritdoc />
+		protected override void Down(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.DropColumn(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings");
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/20200511011048_MYAddHeartbeat.Designer.cs

@@ -0,0 +1,822 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	[DbContext(typeof(MySqlDatabaseContext))]
+	[Migration("20200511011048_MYAddHeartbeat")]
+	partial class MYAddHeartbeat
+	{
+		/// <inheritdoc />
+		protected override void BuildTargetModel(ModelBuilder modelBuilder)
+		{
+#pragma warning disable 612, 618
+			modelBuilder
+				.HasAnnotation("ProductVersion", "3.1.3")
+				.HasAnnotation("Relational:MaxIdentifierLength", 64);
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<ushort?>("ChannelLimit")
+						.IsRequired()
+						.HasColumnType("smallint unsigned");
+
+					b.Property<string>("ConnectionString")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Enabled")
+						.HasColumnType("tinyint(1)");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("varchar(100) CHARACTER SET utf8mb4")
+						.HasMaxLength(100);
+
+					b.Property<int>("Provider")
+						.HasColumnType("int");
+
+					b.Property<uint?>("ReconnectionInterval")
+						.IsRequired()
+						.HasColumnType("int unsigned");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "Name")
+						.IsUnique();
+
+					b.ToTable("ChatBots");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<long>("ChatSettingsId")
+						.HasColumnType("bigint");
+
+					b.Property<ulong?>("DiscordChannelId")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<string>("IrcChannel")
+						.HasColumnType("varchar(100) CHARACTER SET utf8mb4")
+						.HasMaxLength(100);
+
+					b.Property<bool?>("IsAdminChannel")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("IsUpdatesChannel")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("IsWatchdogChannel")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<string>("Tag")
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("ChatSettingsId", "DiscordChannelId")
+						.IsUnique();
+
+					b.HasIndex("ChatSettingsId", "IrcChannel")
+						.IsUnique();
+
+					b.ToTable("ChatChannels");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("ByondVersion")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<int?>("DMApiMajorVersion")
+						.HasColumnType("int");
+
+					b.Property<int?>("DMApiMinorVersion")
+						.HasColumnType("int");
+
+					b.Property<int?>("DMApiPatchVersion")
+						.HasColumnType("int");
+
+					b.Property<Guid?>("DirectoryName")
+						.IsRequired()
+						.HasColumnType("char(36)");
+
+					b.Property<string>("DmeName")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<long>("JobId")
+						.HasColumnType("bigint");
+
+					b.Property<int>("MinimumSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<string>("Output")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("DirectoryName");
+
+					b.HasIndex("JobId")
+						.IsUnique();
+
+					b.HasIndex("RevisionInformationId");
+
+					b.ToTable("CompileJobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<bool?>("AllowWebClient")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("AutoStart")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<uint?>("HeartbeatSeconds")
+						.IsRequired()
+						.HasColumnType("int unsigned");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<ushort?>("PrimaryPort")
+						.IsRequired()
+						.HasColumnType("smallint unsigned");
+
+					b.Property<int?>("ProcessId")
+						.HasColumnType("int");
+
+					b.Property<ushort?>("SecondaryPort")
+						.IsRequired()
+						.HasColumnType("smallint unsigned");
+
+					b.Property<int>("SecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<bool?>("SoftRestart")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("SoftShutdown")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<uint?>("StartupTimeout")
+						.IsRequired()
+						.HasColumnType("int unsigned");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamDaemonSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<ushort?>("ApiValidationPort")
+						.IsRequired()
+						.HasColumnType("smallint unsigned");
+
+					b.Property<int>("ApiValidationSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("ProjectName")
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamMakerSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Instance", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<uint?>("AutoUpdateInterval")
+						.IsRequired()
+						.HasColumnType("int unsigned");
+
+					b.Property<ushort?>("ChatBotLimit")
+						.IsRequired()
+						.HasColumnType("smallint unsigned");
+
+					b.Property<int>("ConfigurationType")
+						.HasColumnType("int");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Online")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<string>("Path")
+						.IsRequired()
+						.HasColumnType("varchar(255) CHARACTER SET utf8mb4");
+
+					b.HasKey("Id");
+
+					b.HasIndex("Path")
+						.IsUnique();
+
+					b.ToTable("Instances");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<ulong>("ByondRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong>("ChatBotRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong>("ConfigurationRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong>("DreamDaemonRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong>("DreamMakerRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<ulong>("InstanceUserRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong>("RepositoryRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<long?>("UserId")
+						.IsRequired()
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("UserId", "InstanceId")
+						.IsUnique();
+
+					b.ToTable("InstanceUsers");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<ulong?>("CancelRight")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<ulong?>("CancelRightsType")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<bool?>("Cancelled")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<long?>("CancelledById")
+						.HasColumnType("bigint");
+
+					b.Property<string>("Description")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<uint?>("ErrorCode")
+						.HasColumnType("int unsigned");
+
+					b.Property<string>("ExceptionDetails")
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<DateTimeOffset?>("StartedAt")
+						.IsRequired()
+						.HasColumnType("datetime(6)");
+
+					b.Property<long>("StartedById")
+						.HasColumnType("bigint");
+
+					b.Property<DateTimeOffset?>("StoppedAt")
+						.HasColumnType("datetime(6)");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CancelledById");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("StartedById");
+
+					b.ToTable("Jobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("AccessIdentifier")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<long>("CompileJobId")
+						.HasColumnType("bigint");
+
+					b.Property<bool>("IsPrimary")
+						.HasColumnType("tinyint(1)");
+
+					b.Property<int>("LaunchSecurityLevel")
+						.HasColumnType("int");
+
+					b.Property<ushort>("Port")
+						.HasColumnType("smallint unsigned");
+
+					b.Property<int>("ProcessId")
+						.HasColumnType("int");
+
+					b.Property<int>("RebootState")
+						.HasColumnType("int");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CompileJobId");
+
+					b.ToTable("ReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<string>("AccessUser")
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("AutoUpdatesKeepTestMerges")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("AutoUpdatesSynchronize")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<string>("CommitterEmail")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<string>("CommitterName")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<bool?>("PostTestMergeComment")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("PushTestMergeCommits")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<bool?>("ShowTestMergeCommitters")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("RepositorySettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("bigint");
+
+					b.Property<long>("TestMergeId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("RevisionInformationId");
+
+					b.HasIndex("TestMergeId");
+
+					b.ToTable("RevInfoTestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("CommitSha")
+						.IsRequired()
+						.HasColumnType("varchar(40) CHARACTER SET utf8mb4")
+						.HasMaxLength(40);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.Property<string>("OriginCommitSha")
+						.IsRequired()
+						.HasColumnType("varchar(40) CHARACTER SET utf8mb4")
+						.HasMaxLength(40);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "CommitSha")
+						.IsUnique();
+
+					b.ToTable("RevisionInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<string>("Author")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<string>("BodyAtMerge")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<string>("Comment")
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<DateTimeOffset>("MergedAt")
+						.HasColumnType("datetime(6)");
+
+					b.Property<long>("MergedById")
+						.HasColumnType("bigint");
+
+					b.Property<int>("Number")
+						.HasColumnType("int");
+
+					b.Property<long?>("PrimaryRevisionInformationId")
+						.IsRequired()
+						.HasColumnType("bigint");
+
+					b.Property<string>("PullRequestRevision")
+						.IsRequired()
+						.HasColumnType("varchar(40) CHARACTER SET utf8mb4")
+						.HasMaxLength(40);
+
+					b.Property<string>("TitleAtMerge")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<string>("Url")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.HasKey("Id");
+
+					b.HasIndex("MergedById");
+
+					b.HasIndex("PrimaryRevisionInformationId")
+						.IsUnique();
+
+					b.ToTable("TestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.Property<long?>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<ulong>("AdministrationRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<string>("CanonicalName")
+						.IsRequired()
+						.HasColumnType("varchar(255) CHARACTER SET utf8mb4");
+
+					b.Property<DateTimeOffset?>("CreatedAt")
+						.IsRequired()
+						.HasColumnType("datetime(6)");
+
+					b.Property<long?>("CreatedById")
+						.HasColumnType("bigint");
+
+					b.Property<bool?>("Enabled")
+						.IsRequired()
+						.HasColumnType("tinyint(1)");
+
+					b.Property<ulong>("InstanceManagerRights")
+						.HasColumnType("bigint unsigned");
+
+					b.Property<DateTimeOffset?>("LastPasswordUpdate")
+						.HasColumnType("datetime(6)");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("longtext CHARACTER SET utf8mb4")
+						.HasMaxLength(10000);
+
+					b.Property<string>("PasswordHash")
+						.HasColumnType("longtext CHARACTER SET utf8mb4");
+
+					b.Property<string>("SystemIdentifier")
+						.HasColumnType("varchar(255) CHARACTER SET utf8mb4");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CanonicalName")
+						.IsUnique();
+
+					b.HasIndex("CreatedById");
+
+					b.HasIndex("SystemIdentifier")
+						.IsUnique();
+
+					b.ToTable("Users");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("bigint");
+
+					b.Property<long?>("AlphaId")
+						.HasColumnType("bigint");
+
+					b.Property<bool>("AlphaIsActive")
+						.HasColumnType("tinyint(1)");
+
+					b.Property<long?>("BravoId")
+						.HasColumnType("bigint");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("bigint");
+
+					b.HasKey("Id");
+
+					b.HasIndex("AlphaId");
+
+					b.HasIndex("BravoId");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("WatchdogReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("ChatSettings")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ChatBot", "ChatSettings")
+						.WithMany("Channels")
+						.HasForeignKey("ChatSettingsId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Job", "Job")
+						.WithOne()
+						.HasForeignKey("Tgstation.Server.Host.Models.CompileJob", "JobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("CompileJobs")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamDaemonSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamDaemonSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamMakerSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamMakerSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("InstanceUsers")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", null)
+						.WithMany("InstanceUsers")
+						.HasForeignKey("UserId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CancelledBy")
+						.WithMany()
+						.HasForeignKey("CancelledById");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("Jobs")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", "StartedBy")
+						.WithMany()
+						.HasForeignKey("StartedById")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.CompileJob", "CompileJob")
+						.WithMany()
+						.HasForeignKey("CompileJobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("RepositorySettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.RepositorySettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("ActiveTestMerges")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.TestMerge", "TestMerge")
+						.WithMany("RevisonInformations")
+						.HasForeignKey("TestMergeId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("RevisionInformations")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "MergedBy")
+						.WithMany("TestMerges")
+						.HasForeignKey("MergedById")
+						.OnDelete(DeleteBehavior.Restrict)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "PrimaryRevisionInformation")
+						.WithOne("PrimaryTestMerge")
+						.HasForeignKey("Tgstation.Server.Host.Models.TestMerge", "PrimaryRevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CreatedBy")
+						.WithMany("CreatedUsers")
+						.HasForeignKey("CreatedById");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Alpha")
+						.WithMany()
+						.HasForeignKey("AlphaId");
+
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Bravo")
+						.WithMany()
+						.HasForeignKey("BravoId");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", null)
+						.WithOne("WatchdogReattachInformation")
+						.HasForeignKey("Tgstation.Server.Host.Models.WatchdogReattachInformation", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+#pragma warning restore 612, 618
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/20200511011048_MYAddHeartbeat.cs

@@ -0,0 +1,35 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using System;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	/// <summary>
+	/// Add heartbeat support for MYSQL.
+	/// </summary>
+	public partial class MYAddHeartbeat : Migration
+	{
+		/// <inheritdoc />
+		protected override void Up(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.AddColumn<uint>(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings",
+				nullable: false,
+				defaultValue: 0u);
+		}
+
+		/// <inheritdoc />
+		protected override void Down(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.DropColumn(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings");
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/20200511012117_SLAddHeartbeat.Designer.cs

@@ -0,0 +1,821 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	[DbContext(typeof(SqliteDatabaseContext))]
+	[Migration("20200511012117_SLAddHeartbeat")]
+	partial class SLAddHeartbeat
+	{
+		/// <inheritdoc />
+		protected override void BuildTargetModel(ModelBuilder modelBuilder)
+		{
+#pragma warning disable 612, 618
+			modelBuilder
+				.HasAnnotation("ProductVersion", "3.1.3");
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort?>("ChannelLimit")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("ConnectionString")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Enabled")
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(100);
+
+					b.Property<int>("Provider")
+						.HasColumnType("INTEGER");
+
+					b.Property<uint?>("ReconnectionInterval")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "Name")
+						.IsUnique();
+
+					b.ToTable("ChatBots");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("ChatSettingsId")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong?>("DiscordChannelId")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("IrcChannel")
+						.HasColumnType("TEXT")
+						.HasMaxLength(100);
+
+					b.Property<bool?>("IsAdminChannel")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("IsUpdatesChannel")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("IsWatchdogChannel")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Tag")
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("ChatSettingsId", "DiscordChannelId")
+						.IsUnique();
+
+					b.HasIndex("ChatSettingsId", "IrcChannel")
+						.IsUnique();
+
+					b.ToTable("ChatChannels");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("ByondVersion")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<int?>("DMApiMajorVersion")
+						.HasColumnType("INTEGER");
+
+					b.Property<int?>("DMApiMinorVersion")
+						.HasColumnType("INTEGER");
+
+					b.Property<int?>("DMApiPatchVersion")
+						.HasColumnType("INTEGER");
+
+					b.Property<Guid?>("DirectoryName")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<string>("DmeName")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<long>("JobId")
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("MinimumSecurityLevel")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Output")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("DirectoryName");
+
+					b.HasIndex("JobId")
+						.IsUnique();
+
+					b.HasIndex("RevisionInformationId");
+
+					b.ToTable("CompileJobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("TEXT");
+
+					b.Property<bool?>("AllowWebClient")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("AutoStart")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<uint?>("HeartbeatSeconds")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort?>("PrimaryPort")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<int?>("ProcessId")
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort?>("SecondaryPort")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("SecurityLevel")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("SoftRestart")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("SoftShutdown")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<uint?>("StartupTimeout")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamDaemonSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort?>("ApiValidationPort")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("ApiValidationSecurityLevel")
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("ProjectName")
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("DreamMakerSettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Instance", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<uint?>("AutoUpdateInterval")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort?>("ChatBotLimit")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("ConfigurationType")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("Online")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Path")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.HasKey("Id");
+
+					b.HasIndex("Path")
+						.IsUnique();
+
+					b.ToTable("Instances");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("ByondRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("ChatBotRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("ConfigurationRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("DreamDaemonRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("DreamMakerRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("InstanceUserRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("RepositoryRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<long?>("UserId")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("UserId", "InstanceId")
+						.IsUnique();
+
+					b.ToTable("InstanceUsers");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong?>("CancelRight")
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong?>("CancelRightsType")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("Cancelled")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<long?>("CancelledById")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Description")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<uint?>("ErrorCode")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("ExceptionDetails")
+						.HasColumnType("TEXT");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<DateTimeOffset?>("StartedAt")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<long>("StartedById")
+						.HasColumnType("INTEGER");
+
+					b.Property<DateTimeOffset?>("StoppedAt")
+						.HasColumnType("TEXT");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CancelledById");
+
+					b.HasIndex("InstanceId");
+
+					b.HasIndex("StartedById");
+
+					b.ToTable("Jobs");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("AccessIdentifier")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<long>("CompileJobId")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool>("IsPrimary")
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("LaunchSecurityLevel")
+						.HasColumnType("INTEGER");
+
+					b.Property<ushort>("Port")
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("ProcessId")
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("RebootState")
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CompileJobId");
+
+					b.ToTable("ReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("AccessToken")
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<string>("AccessUser")
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<bool?>("AutoUpdatesKeepTestMerges")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("AutoUpdatesSynchronize")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("CommitterEmail")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<string>("CommitterName")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("PostTestMergeComment")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("PushTestMergeCommits")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("ShowTestMergeCommitters")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("RepositorySettings");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("RevisionInformationId")
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("TestMergeId")
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("RevisionInformationId");
+
+					b.HasIndex("TestMergeId");
+
+					b.ToTable("RevInfoTestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("CommitSha")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(40);
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("OriginCommitSha")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(40);
+
+					b.HasKey("Id");
+
+					b.HasIndex("InstanceId", "CommitSha")
+						.IsUnique();
+
+					b.ToTable("RevisionInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("Author")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<string>("BodyAtMerge")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<string>("Comment")
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<DateTimeOffset>("MergedAt")
+						.HasColumnType("TEXT");
+
+					b.Property<long>("MergedById")
+						.HasColumnType("INTEGER");
+
+					b.Property<int>("Number")
+						.HasColumnType("INTEGER");
+
+					b.Property<long?>("PrimaryRevisionInformationId")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("PullRequestRevision")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(40);
+
+					b.Property<string>("TitleAtMerge")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<string>("Url")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.HasKey("Id");
+
+					b.HasIndex("MergedById");
+
+					b.HasIndex("PrimaryRevisionInformationId")
+						.IsUnique();
+
+					b.ToTable("TestMerges");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.Property<long?>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("AdministrationRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<string>("CanonicalName")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<DateTimeOffset?>("CreatedAt")
+						.IsRequired()
+						.HasColumnType("TEXT");
+
+					b.Property<long?>("CreatedById")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool?>("Enabled")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
+					b.Property<ulong>("InstanceManagerRights")
+						.HasColumnType("INTEGER");
+
+					b.Property<DateTimeOffset?>("LastPasswordUpdate")
+						.HasColumnType("TEXT");
+
+					b.Property<string>("Name")
+						.IsRequired()
+						.HasColumnType("TEXT")
+						.HasMaxLength(10000);
+
+					b.Property<string>("PasswordHash")
+						.HasColumnType("TEXT");
+
+					b.Property<string>("SystemIdentifier")
+						.HasColumnType("TEXT");
+
+					b.HasKey("Id");
+
+					b.HasIndex("CanonicalName")
+						.IsUnique();
+
+					b.HasIndex("CreatedById");
+
+					b.HasIndex("SystemIdentifier")
+						.IsUnique();
+
+					b.ToTable("Users");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.Property<long>("Id")
+						.ValueGeneratedOnAdd()
+						.HasColumnType("INTEGER");
+
+					b.Property<long?>("AlphaId")
+						.HasColumnType("INTEGER");
+
+					b.Property<bool>("AlphaIsActive")
+						.HasColumnType("INTEGER");
+
+					b.Property<long?>("BravoId")
+						.HasColumnType("INTEGER");
+
+					b.Property<long>("InstanceId")
+						.HasColumnType("INTEGER");
+
+					b.HasKey("Id");
+
+					b.HasIndex("AlphaId");
+
+					b.HasIndex("BravoId");
+
+					b.HasIndex("InstanceId")
+						.IsUnique();
+
+					b.ToTable("WatchdogReattachInformations");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatBot", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("ChatSettings")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ChatChannel", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ChatBot", "ChatSettings")
+						.WithMany("Channels")
+						.HasForeignKey("ChatSettingsId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.CompileJob", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Job", "Job")
+						.WithOne()
+						.HasForeignKey("Tgstation.Server.Host.Models.CompileJob", "JobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("CompileJobs")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamDaemonSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamDaemonSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamDaemonSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.DreamMakerSettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("DreamMakerSettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.DreamMakerSettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.InstanceUser", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("InstanceUsers")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", null)
+						.WithMany("InstanceUsers")
+						.HasForeignKey("UserId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.Job", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CancelledBy")
+						.WithMany()
+						.HasForeignKey("CancelledById");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("Jobs")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.User", "StartedBy")
+						.WithMany()
+						.HasForeignKey("StartedById")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.ReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.CompileJob", "CompileJob")
+						.WithMany()
+						.HasForeignKey("CompileJobId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RepositorySettings", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithOne("RepositorySettings")
+						.HasForeignKey("Tgstation.Server.Host.Models.RepositorySettings", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevInfoTestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "RevisionInformation")
+						.WithMany("ActiveTestMerges")
+						.HasForeignKey("RevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.TestMerge", "TestMerge")
+						.WithMany("RevisonInformations")
+						.HasForeignKey("TestMergeId")
+						.OnDelete(DeleteBehavior.ClientNoAction)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.RevisionInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.Instance", "Instance")
+						.WithMany("RevisionInformations")
+						.HasForeignKey("InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.TestMerge", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "MergedBy")
+						.WithMany("TestMerges")
+						.HasForeignKey("MergedById")
+						.OnDelete(DeleteBehavior.Restrict)
+						.IsRequired();
+
+					b.HasOne("Tgstation.Server.Host.Models.RevisionInformation", "PrimaryRevisionInformation")
+						.WithOne("PrimaryTestMerge")
+						.HasForeignKey("Tgstation.Server.Host.Models.TestMerge", "PrimaryRevisionInformationId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.User", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.User", "CreatedBy")
+						.WithMany("CreatedUsers")
+						.HasForeignKey("CreatedById");
+				});
+
+			modelBuilder.Entity("Tgstation.Server.Host.Models.WatchdogReattachInformation", b =>
+				{
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Alpha")
+						.WithMany()
+						.HasForeignKey("AlphaId");
+
+					b.HasOne("Tgstation.Server.Host.Models.ReattachInformation", "Bravo")
+						.WithMany()
+						.HasForeignKey("BravoId");
+
+					b.HasOne("Tgstation.Server.Host.Models.Instance", null)
+						.WithOne("WatchdogReattachInformation")
+						.HasForeignKey("Tgstation.Server.Host.Models.WatchdogReattachInformation", "InstanceId")
+						.OnDelete(DeleteBehavior.Cascade)
+						.IsRequired();
+				});
+#pragma warning restore 612, 618
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/20200511012117_SLAddHeartbeat.cs

@@ -0,0 +1,35 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using System;
+
+namespace Tgstation.Server.Host.Database.Migrations
+{
+	/// <summary>
+	/// Add heartbeat support for SQLite.
+	/// </summary>
+	public partial class SLAddHeartbeat : Migration
+	{
+		/// <inheritdoc />
+		protected override void Up(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.AddColumn<uint>(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings",
+				nullable: false,
+				defaultValue: 0u);
+		}
+
+		/// <inheritdoc />
+		protected override void Down(MigrationBuilder migrationBuilder)
+		{
+			if (migrationBuilder == null)
+				throw new ArgumentNullException(nameof(migrationBuilder));
+
+			migrationBuilder.DropColumn(
+				name: "HeartbeatSeconds",
+				table: "DreamDaemonSettings");
+		}
+	}
+}

src/Tgstation.Server.Host/Database/Migrations/MySqlDatabaseContextModelSnapshot.cs

@@ -168,6 +168,10 @@ namespace Tgstation.Server.Host.Database.Migrations
 						.IsRequired()
 						.HasColumnType("tinyint(1)");
 
+					b.Property<uint?>("HeartbeatSeconds")
+						.IsRequired()
+						.HasColumnType("int unsigned");
+
 					b.Property<long>("InstanceId")
 						.HasColumnType("bigint");
 

src/Tgstation.Server.Host/Database/Migrations/SqlServerDatabaseContextModelSnapshot.cs

@@ -174,6 +174,9 @@ namespace Tgstation.Server.Host.Database.Migrations
 						.IsRequired()
 						.HasColumnType("bit");
 
+					b.Property<long>("HeartbeatSeconds")
+						.HasColumnType("bigint");
+
 					b.Property<long>("InstanceId")
 						.HasColumnType("bigint");
 

src/Tgstation.Server.Host/Database/Migrations/SqliteDatabaseContextModelSnapshot.cs

@@ -167,6 +167,10 @@ namespace Tgstation.Server.Host.Database.Migrations
 						.IsRequired()
 						.HasColumnType("INTEGER");
 
+					b.Property<uint?>("HeartbeatSeconds")
+						.IsRequired()
+						.HasColumnType("INTEGER");
+
 					b.Property<long>("InstanceId")
 						.HasColumnType("INTEGER");