* Extended functionalities

* Added different UIs

MealPlan.Api/Data/SequenceMaintenance.cs

@@ -0,0 +1,50 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace MealPlan.Api.Data;
+
+/// <summary>
+/// Resyncs PostgreSQL identity sequences after bulk imports or manual ID inserts.
+/// </summary>
+public static class SequenceMaintenance
+{
+    private static readonly (string Table, string Column)[] IdentityTables =
+    [
+        ("Recipes", "Id"),
+        ("Ingredients", "Id"),
+        ("RecipeSteps", "Id"),
+        ("RecipeGeneratorSessions", "Id"),
+        ("DietGeneratorSessions", "Id"),
+        ("DietGeneratorDraftMeals", "Id"),
+        ("DietGeneratorDraftMealIngredients", "Id"),
+        ("MealPlanEntries", "Id"),
+    ];
+
+    public static async Task<IReadOnlyList<string>> ResyncIdentitySequencesAsync(
+        AppDbContext db,
+        CancellationToken ct = default)
+    {
+        var messages = new List<string>();
+
+        foreach (var (table, column) in IdentityTables)
+        {
+            var sql = $"""
+                SELECT setval(
+                    pg_get_serial_sequence('diet."{table}"', '{column}'),
+                    COALESCE((SELECT MAX("{column}") FROM diet."{table}"), 1),
+                    (SELECT MAX("{column}") IS NOT NULL FROM diet."{table}"))
+                """;
+
+            try
+            {
+                await db.Database.ExecuteSqlRawAsync(sql, ct);
+                messages.Add($"Resynced diet.\"{table}\".\"{column}\" sequence.");
+            }
+            catch (Exception ex)
+            {
+                messages.Add($"Skipped diet.\"{table}\": {ex.Message}");
+            }
+        }
+
+        return messages;
+    }
+}