Adds option pattern for smart config

Core/Configurations/SmartConfigProvider/Repositories/PostgresConfigurationRepository.cs

@@ -0,0 +1,35 @@
+using System.Data;
+using Core.Configurations.SmartConfiguration;
+using Insight.Database;
+
+namespace Core.Configurations.SmartConfigProvider.Repositories;
+public class PostgresConfigurationRepository : IConfigurationRepository
+{
+    private IDbConnection _connection;
+    public string ConnectionString { get; set; }
+
+
+    public PostgresConfigurationRepository(string connectionString)
+    {
+        _connection = new Npgsql.NpgsqlConnection(connectionString);
+    }
+    public PostgresConfigurationRepository()
+    {
+
+    }
+    public IEnumerable<AppConfiguration> GetActiveConfigurations()
+    {
+        _connection ??= new Npgsql.NpgsqlConnection(ConnectionString);
+
+        const string sql = @"
+            SELECT id, ""key"", value, label, content_type, 
+                   valid_from, expires_at, created_at, modified_at, etag 
+            FROM app_configuration 
+            WHERE CURRENT_TIMESTAMP BETWEEN valid_from AND expires_at
+               OR (valid_from IS NULL AND expires_at IS NULL)";
+
+
+        return _connection.QuerySql<AppConfiguration>(sql);
+
+    }
+}