Log server ID in connection logs table (#21911)

Content.Server/Database/ServerDbEntryManager.cs

@@ -0,0 +1,39 @@
+using System.Threading.Tasks;
+using Content.Shared.CCVar;
+using Robust.Shared.Configuration;
+
+namespace Content.Server.Database;
+
+/// <summary>
+/// Stupid tiny manager whose sole purpose is keeping track of the <see cref="Server"/> database entry for this server.
+/// </summary>
+/// <remarks>
+/// This allows the value to be cached,
+/// so it can be easily retrieved by later code that needs to log the server ID to the database.
+/// </remarks>
+public sealed class ServerDbEntryManager
+{
+    [Dependency] private readonly IConfigurationManager _cfg = default!;
+    [Dependency] private readonly IServerDbManager _db = default!;
+    [Dependency] private readonly ILogManager _logManager = default!;
+
+    private Task<Server>? _serverEntityTask;
+
+    /// <summary>
+    /// The entity that represents this server in the database.
+    /// </summary>
+    /// <remarks>
+    /// This value is cached when first requested. Do not re-use this entity; if you need data like the rounds,
+    /// request it manually with <see cref="IServerDbManager.AddOrGetServer"/>.
+    /// </remarks>
+    public Task<Server> ServerEntity => _serverEntityTask ??= GetServerEntity();
+
+    private async Task<Server> GetServerEntity()
+    {
+        var name = _cfg.GetCVar(CCVars.AdminLogsServerName);
+        var server = await _db.AddOrGetServer(name);
+
+        _logManager.GetSawmill("db").Verbose("Server name: {Name}, ID in database: {Id}", server, server.Id);
+        return server;
+    }
+}