Centralize Postgres connection string policy across all modules

Extract connection string building into PostgresConnectionStringPolicy so all
services use consistent pooling, application_name, and timeout settings.
Adopt the new policy in 20+ module DataSource/ServiceCollectionExtensions classes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Doctor/StellaOps.Doctor.WebService/Services/PostgresReportStorageService.cs

@@ -23,7 +23,7 @@ namespace StellaOps.Doctor.WebService.Services;
 /// </summary>
 public sealed class PostgresReportStorageService : IReportStorageService, IDisposable
 {
-    private readonly string _connectionString;
+    private readonly NpgsqlDataSource _dataSource;
     private readonly DoctorServiceOptions _options;
     private readonly ILogger<PostgresReportStorageService> _logger;
     private readonly Timer? _cleanupTimer;
@@ -37,9 +37,10 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
         IOptions<DoctorServiceOptions> options,
         ILogger<PostgresReportStorageService> logger)
     {
-        _connectionString = configuration.GetConnectionString("StellaOps")
+        var connectionString = configuration.GetConnectionString("StellaOps")
             ?? configuration["Database:ConnectionString"]
             ?? throw new InvalidOperationException("Database connection string not configured");
+        _dataSource = CreateDataSource(connectionString);
         _options = options.Value;
         _logger = logger;
 
@@ -60,8 +61,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
         var json = JsonSerializer.Serialize(report, JsonSerializerOptions.Default);
         var compressed = CompressJson(json);
 
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = """
             INSERT INTO doctor_reports (run_id, started_at, completed_at, overall_severity, 
@@ -104,8 +104,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
     /// <inheritdoc />
     public async Task<DoctorReport?> GetReportAsync(string runId, CancellationToken ct)
     {
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = "SELECT report_json_compressed FROM doctor_reports WHERE run_id = @runId";
 
@@ -126,8 +125,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
     /// <inheritdoc />
     public async Task<IReadOnlyList<ReportSummaryDto>> ListReportsAsync(int limit, int offset, CancellationToken ct)
     {
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = """
             SELECT run_id, started_at, completed_at, overall_severity,
@@ -170,8 +168,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
     /// <inheritdoc />
     public async Task<bool> DeleteReportAsync(string runId, CancellationToken ct)
     {
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = "DELETE FROM doctor_reports WHERE run_id = @runId";
 
@@ -185,8 +182,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
     /// <inheritdoc />
     public async Task<int> GetCountAsync(CancellationToken ct)
     {
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = "SELECT COUNT(*) FROM doctor_reports";
 
@@ -207,8 +203,7 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
 
         var cutoff = DateTimeOffset.UtcNow.AddDays(-_options.ReportRetentionDays);
 
-        await using var connection = new NpgsqlConnection(_connectionString);
-        await connection.OpenAsync(ct);
+        await using var connection = await _dataSource.OpenConnectionAsync(ct);
 
         const string sql = "DELETE FROM doctor_reports WHERE created_at < @cutoff";
 
@@ -261,7 +256,20 @@ public sealed class PostgresReportStorageService : IReportStorageService, IDispo
         if (!_disposed)
         {
             _cleanupTimer?.Dispose();
+            _dataSource.Dispose();
             _disposed = true;
         }
     }
+
+    private static NpgsqlDataSource CreateDataSource(string connectionString)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(connectionString);
+
+        var connectionStringBuilder = new NpgsqlConnectionStringBuilder(connectionString)
+        {
+            ApplicationName = "stellaops-doctor-report-storage"
+        };
+
+        return new NpgsqlDataSourceBuilder(connectionStringBuilder.ConnectionString).Build();
+    }
 }

src/Doctor/StellaOps.Doctor.WebService/TASKS.md

@@ -3,6 +3,7 @@
 ## Completed
 
 ### 2026-01-12 - Sprint 001_007 Implementation
+- [x] SPRINT_20260405_011-XPORT: named the PostgreSQL report-storage data source and aligned the runtime path with the shared transport attribution guardrail.
 - [x] Created project structure following Platform WebService pattern
 - [x] Implemented DoctorServiceOptions with authority configuration
 - [x] Defined DoctorPolicies and DoctorScopes for authorization