stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.ReachGraph.Persistence/PostgresReachGraphRepository.Tenant.cs

@@ -0,0 +1,18 @@
+// Licensed to StellaOps under the BUSL-1.1 license.
+using Npgsql;
+
+namespace StellaOps.ReachGraph.Persistence;
+
+public sealed partial class PostgresReachGraphRepository
+{
+    private static async Task SetTenantContextAsync(
+        NpgsqlConnection connection,
+        string tenantId,
+        CancellationToken cancellationToken)
+    {
+        await using var command = connection.CreateCommand();
+        command.CommandText = "SELECT set_config('app.tenant_id', @TenantId, false);";
+        command.Parameters.AddWithValue("TenantId", tenantId);
+        await command.ExecuteNonQueryAsync(cancellationToken).ConfigureAwait(false);
+    }
+}