Added Card model, updated database initialization, udated readme.

SDG-Backend-Barracuda/Models/CardModel.cs

@@ -0,0 +1,50 @@
+using Dapper;
+using Npgsql;
+
+namespace SDG_Backend_Barracuda.Models;
+
+public record Card(int Id, string Value);
+public record CardInput(string Value);
+
+public interface ICardModel : IDatabaseModel<Card, CardInput>
+{
+}
+
+public class CardModel(NpgsqlDataSource dataSource) : ICardModel
+{
+    public async Task<IEnumerable<Card>> GetAllAsync()
+    {
+        await using var connection = await dataSource.OpenConnectionAsync();
+        var sql = """SELECT "Id", "Value" FROM "Card";""";
+        return await connection.QueryAsync<Card>(sql);
+    }
+
+    public async Task<Card?> GetByIdAsync(int id)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync();
+        var sql = """SELECT "Id", "Value" FROM "Card" WHERE "Id" = @Id;""";
+        return await connection.QueryFirstOrDefaultAsync<Card>(sql, new { Id = id });
+    }
+
+    public async Task<Card> CreateAsync(CardInput input)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync();
+        var sql = """INSERT INTO "Card" ("Value") VALUES (@Value) RETURNING "Id", "Value";""";
+        return await connection.QuerySingleAsync<Card>(sql, input);
+    }
+
+    public async Task<Card?> UpdateAsync(int id, CardInput input)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync();
+        var sql = """UPDATE "Card" SET "Value" = @Value WHERE "Id" = @Id RETURNING "Id", "Value";""";
+        return await connection.QueryFirstOrDefaultAsync<Card>(sql, new { Id = id, Value = input.Value });
+    }
+
+    public async Task<bool> DeleteAsync(int id)
+    {
+        await using var connection = await dataSource.OpenConnectionAsync();
+        var sql = """DELETE FROM "Card" WHERE "Id" = @Id;""";
+        var rowsAffected = await connection.ExecuteAsync(sql, new { Id = id });
+        return rowsAffected > 0;
+    }
+}