DbContext class separated.

code/MessengerBroker.Db/BrokerDbContext.cs

@@ -5,28 +5,10 @@ namespace MessengerBroker.Db
 {
     public class BrokerDbContext : DbContext
     {
-        private string connectionString;
-
         public DbSet<Sync> Syncs { get; }
 
         public DbSet<User> Users { get; }
 
         public DbSet<Message> Messages { get; }
-
-        public BrokerDbContext(string connectionString)
-        {
-            this.connectionString = connectionString;
-        }
-
-        protected override void OnModelCreating(ModelBuilder modelBuilder)
-        {
-            base.OnModelCreating(modelBuilder);
-        }
-
-        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
-        {
-            base.OnConfiguring(optionsBuilder);
-            optionsBuilder.UseSqlServer(this.connectionString);
-        }
     }
 }