core services and tests

src/dotnet/QuantEngine.Infrastructure/Properties/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("QuantEngine.Core.Tests")]

src/dotnet/QuantEngine.Infrastructure/Repositories/PostgresqlHistoryStore.cs

@@ -24,6 +24,14 @@ namespace QuantEngine.Infrastructure.Repositories
             _connectionFactory = connectionFactory;
         }
 
+        internal static IReadOnlyDictionary<string, string[]> GetDomainColumns() => DomainColumns;
+
+        internal static string BuildInsertSql(string domain, IReadOnlyList<string> insertColumns)
+            => $@"INSERT INTO engine_history.{domain} ({string.Join(", ", insertColumns)}) VALUES ({string.Join(", ", insertColumns.Select(column => $"@{column}"))})";
+
+        internal static string BuildSnapshotSql(string domain, int limit)
+            => $@"SELECT * FROM engine_history.{domain} ORDER BY created_at DESC LIMIT @Limit";
+
         public async Task<int> AppendAsync(string domain, IDictionary<string, object?> payload)
         {
             if (!DomainColumns.TryGetValue(domain, out var columns))
@@ -34,20 +42,17 @@ namespace QuantEngine.Infrastructure.Repositories
 
             var values = new DynamicParameters();
             var insertColumns = new List<string>(columns.Length + 1);
-            var placeholders = new List<string>(columns.Length + 1);
             foreach (var column in columns)
             {
                 insertColumns.Add(column);
-                placeholders.Add($"@{column}");
                 values.Add(column, payload.TryGetValue(column, out var value) ? value : null);
             }
 
             insertColumns.Add("provenance");
-            placeholders.Add("@provenance");
             var provenance = payload.TryGetValue("provenance", out var provenanceValue) ? provenanceValue : new Dictionary<string, object?>();
             values.Add("provenance", provenance is string s ? s : JsonSerializer.Serialize(provenance));
 
-            var sql = $@"INSERT INTO engine_history.{domain} ({string.Join(", ", insertColumns)}) VALUES ({string.Join(", ", placeholders)})";
+            var sql = BuildInsertSql(domain, insertColumns);
             return await conn.ExecuteAsync(sql, values);
         }
 
@@ -59,7 +64,7 @@ namespace QuantEngine.Infrastructure.Repositories
             using var conn = _connectionFactory.CreateConnection();
             conn.Open();
 
-            var sql = $@"SELECT * FROM engine_history.{domain} ORDER BY created_at DESC LIMIT @Limit";
+            var sql = BuildSnapshotSql(domain, limit);
             var rows = await conn.QueryAsync(sql, new { Limit = limit });
             return rows.Select(row => (IDictionary<string, object?>)row).ToList();
         }