Added support for table prefix

[argxh]

Added support for table prefix

The feature was required for integration in a multi-database web service and aligns PostgreSQL behavior with other DB providers.

Table prefixing is applied after migrations execution, so it does not affect existing or future raw SQL migrations and remains fully backward compatible.

Whats new?

• Added parameters UseTablePrefix and TablePrefixName in PostgreSqlStorageOptions
• Added handlers in all the db operations
• Added unit tests

How to use?

Both parameters have default values like false for UseTablePrefix and "hangfire"_ for TablePrefixName, so you can customize it or leave it default.

You can simply define them in your database configuration within your project:

services.AddHangfire(config =>
 {
     config.UsePostgreSqlStorage(options =>
     {
         options.UseNpgsqlConnection(connectionString);
     }, new PostgreSqlStorageOptions
     {
         QueuePollInterval = TimeSpan.FromSeconds(15),
         PrepareSchemaIfNecessary = true,
         DistributedLockTimeout = TimeSpan.FromMinutes(10),
         InvisibilityTimeout = TimeSpan.FromMinutes(30),
         UseTablePrefix = true,
         TablePrefixName = "prefix_here"
     });
     config.UseSimpleAssemblyNameTypeSerializer();
     config.UseRecommendedSerializerSettings();
     
 });

[azygis]

I would prefer less verbosity - instead of two properties, use one, TablePrefix, default to nothing. At that point there's no need for a bunch of conditionals, simply format the string with $"{tablePrefix}{tableName}. You opt-in to this by simply setting one property for prefix.