Adding of archive items is mostly operational. Need to handle file upload

OpenArchival.Database/Defects/DefectsProvider.cs

@@ -0,0 +1,69 @@
+using Dapper;
+using Npgsql;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Quic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenArchival.Database;
+
+public class DefectsProvider : IDefectsProvider
+{
+    NpgsqlDataSource _dataSource;
+
+    public DefectsProvider(NpgsqlDataSource dataSource)
+    {
+        _dataSource = dataSource;
+    }
+
+    public async Task<bool> AddDefect(string defect)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"INSERT INTO defects (defect) VALUES (@Defect)";
+
+        var rowsAffected = await connection.ExecuteAsync(sql, new {Defect=defect});
+
+        return rowsAffected == 1;
+    }
+
+    public async Task<bool> RemoveDefect(string defect)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"DELETE FROM defects WHERE defect = @Defect";
+
+        var rowsAffected = await connection.ExecuteAsync(sql, new {Defect=defect});
+
+        return rowsAffected == 1;
+    }
+
+    public async Task<bool> ContainsDefect(string defect)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"SELECT EXISTS(SELECT 1 FROM defects WHERE defect = @Defect)";
+
+        return await connection.QueryFirstOrDefaultAsync<bool>(sql, new { Defect = defect });
+    }
+
+    public async Task<IEnumerable<string>> SearchDefects(string query)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"SELECT defect FROM defects WHERE POSITION(LOWER(@Query) in LOWER(defect)) > 0";
+
+        return await connection.QueryAsync<string>(sql, new { Query=query });
+    }
+
+    public async Task<IEnumerable<string>> TopDefects(int resultCount)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = $@"SELECT defect FROM defects ORDER BY defect ASC LIMIT {resultCount}";
+
+        return await connection.QueryAsync<string>(sql);
+    }
+}