Add server configuration service and repo

RecNet.Infrastructure/Persistence/Repositories/ServerConfigRepository.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage;
+using RecNet.Domain.Entities.Configuration;
+using RecNet.Domain.Repositories;
+
+namespace RecNet.Infrastructure.Persistence.Repositories;
+
+public class ServerConfigRepository(DatabaseContext dbContext) : IServerConfigRepository
+{
+    public Task<ServerConfig?> GetAsync(string key, CancellationToken ct = default)
+        => dbContext.ServerConfigs
+            .FirstOrDefaultAsync(x => x.Key == key, ct);
+
+    public async Task SetAsync(string key, string value, CancellationToken ct = default)
+    {
+        var config = await GetAsync(key, ct);
+
+        if (config is null)
+        {
+            config = ServerConfig.Create(key, value);
+            await dbContext.ServerConfigs.AddAsync(config, ct);
+            return;
+        }
+
+        config.SetValue(value);
+    }
+
+    public Task SaveChangesAsync(CancellationToken ct = default)
+        => dbContext.SaveChangesAsync(ct);
+}