adding cache

OpenCand.API/Repository/OpenCandRepository.cs

@@ -1,29 +1,45 @@
 using Dapper;
+using Microsoft.Extensions.Caching.Memory;
 using Npgsql;
 using OpenCand.Core.Models;
 using OpenCand.Repository;
 
 namespace OpenCand.API.Repository
-{
-    public class OpenCandRepository : BaseRepository
+{    public class OpenCandRepository : BaseRepository
     {
-        public OpenCandRepository(IConfiguration configuration) : base(configuration)
+        public OpenCandRepository(IConfiguration configuration, IMemoryCache? cache = null) : base(configuration, cache)
         {
         }
 
         public async Task<OpenCandStats> GetOpenCandStatsAsync()
         {
-            using (var connection = new NpgsqlConnection(ConnectionString))
+            string cacheKey = GenerateCacheKey("OpenCandStats");
+            
+            var result = await GetOrSetCacheAsync(cacheKey, async () =>
             {
-                var stats = await connection.QueryFirstOrDefaultAsync<OpenCandStats>(@"
-                    SELECT 
-                        (SELECT COUNT(idcandidato) FROM candidato) AS TotalCandidatos,
-                        (SELECT COUNT(*) FROM bem_candidato) AS TotalBemCandidatos,
-                        (SELECT SUM(valor) FROM bem_candidato) AS TotalValorBemCandidatos,
-                        (SELECT COUNT(*) FROM rede_social) AS TotalRedesSociais,
-                        (SELECT COUNT(DISTINCT ano) FROM candidato_mapping) AS TotalEleicoes;");
-                return stats ?? new OpenCandStats();
-            }
+                using (var connection = new NpgsqlConnection(ConnectionString))
+                {
+                    var stats = await connection.QueryFirstOrDefaultAsync<OpenCandStats>(@"
+                        SELECT 
+                            (SELECT COUNT(idcandidato) FROM candidato) AS TotalCandidatos,
+                            (SELECT COUNT(*) FROM bem_candidato) AS TotalBemCandidatos,
+                            (SELECT SUM(valor) FROM bem_candidato) AS TotalValorBemCandidatos,
+                            (SELECT COUNT(*) FROM rede_social) AS TotalRedesSociais,
+                            (SELECT COUNT(DISTINCT ano) FROM candidato_mapping) AS TotalEleicoes;");
+                    
+                    return stats ?? new OpenCandStats();
+                }
+            });
+            
+            return result ?? new OpenCandStats();
+        }
+
+        /// <summary>
+        /// Clears the cached OpenCand statistics, forcing a fresh fetch on the next call
+        /// </summary>
+        public void ClearStatsCache()
+        {
+            ClearCache(GenerateCacheKey("OpenCandStats"));
         }
     }
 }