Improve workers for backtests

src/Managing.Application.Abstractions/Repositories/IJobRepository.cs

@@ -62,6 +62,24 @@ public interface IJobRepository
     /// </summary>
     Task<IEnumerable<Job>> GetByGeneticRequestIdAsync(string geneticRequestId);
 
+    /// <summary>
+    /// Gets running job counts per user for a specific job type across all workers (global limit per user)
+    /// </summary>
+    /// <param name="workerId">The ID of the worker (kept for interface compatibility, not used for filtering)</param>
+    /// <param name="jobType">The job type to filter by</param>
+    /// <returns>Dictionary mapping UserId to count of running jobs</returns>
+    Task<Dictionary<int, int>> GetRunningJobCountsByUserIdAsync(string workerId, JobType jobType);
+
+    /// <summary>
+    /// Claims a random available job, atomically excluding users that have reached their capacity.
+    /// The capacity check happens within the SQL query using a subquery, ensuring thread-safety across multiple workers.
+    /// Returns null if no jobs are available.
+    /// </summary>
+    /// <param name="workerId">The ID of the worker claiming the job</param>
+    /// <param name="jobType">The job type to claim</param>
+    /// <param name="maxConcurrentPerUser">Maximum concurrent jobs allowed per user</param>
+    Task<Job?> ClaimRandomJobAsync(string workerId, JobType jobType, int maxConcurrentPerUser);
+
     /// <summary>
     /// Gets paginated jobs with optional filters and sorting
     /// </summary>
@@ -91,6 +109,12 @@ public interface IJobRepository
     /// </summary>
     /// <returns>Summary containing counts by status, job type, and their combinations</returns>
     Task<JobSummary> GetSummaryAsync();
+
+    /// <summary>
+    /// Deletes a job by its ID
+    /// </summary>
+    /// <param name="jobId">The job ID to delete</param>
+    Task DeleteAsync(Guid jobId);
 }
 
 /// <summary>