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AMREZ.EOP.Infrastructures/Tenancy/TenantRlsInterceptor.cs

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+using System.Data.Common;
+using Microsoft.EntityFrameworkCore.Diagnostics;
+
+namespace AMREZ.EOP.Infrastructures.Tenancy;
+
+public sealed class TenantRlsInterceptor : DbConnectionInterceptor
+{
+    private string _tenant = "";
+    public void Configure(string tenantId) => _tenant = tenantId?.Trim() ?? "";
+
+    public override async Task ConnectionOpenedAsync(
+        DbConnection connection,
+        ConnectionEndEventData eventData,
+        CancellationToken cancellationToken = default)
+    {
+        // ตั้งแค่ RLS session param เท่านั้น
+        if (!string.IsNullOrWhiteSpace(_tenant))
+        {
+            await using var cmd = connection.CreateCommand();
+            var v = _tenant.Replace("'", "''");
+            cmd.CommandText = $"SET LOCAL app.tenant_id = '{v}';";
+            await cmd.ExecuteNonQueryAsync(cancellationToken);
+        }
+
+        await base.ConnectionOpenedAsync(connection, eventData, cancellationToken);
+    }
+}