Refactor app architecture and clean local artifacts

Backend/Repositories/AdminAuditRepository.cs

@@ -0,0 +1,9 @@
+using Backend.Data;
+using Backend.Domain;
+
+namespace Backend.Repositories;
+
+public sealed class AdminAuditRepository(AwardsDbContext dbContext) : IAdminAuditRepository
+{
+    public void Add(AdminAuditEntry entry) => dbContext.AdminAuditEntries.Add(entry);
+}

Backend/Repositories/IAdminAuditRepository.cs

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+using Backend.Domain;
+
+namespace Backend.Repositories;
+
+public interface IAdminAuditRepository
+{
+    void Add(AdminAuditEntry entry);
+}

Backend/Repositories/IRiskFlagRepository.cs

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+using Backend.Domain;
+
+namespace Backend.Repositories;
+
+public interface IRiskFlagRepository
+{
+    Task<bool> ExistsOpenRecentAsync(
+        int? seasonId,
+        string? twitchUserId,
+        string source,
+        string type,
+        string clientIp,
+        DateTimeOffset threshold,
+        CancellationToken cancellationToken = default);
+
+    void Add(RiskFlag riskFlag);
+}

Backend/Repositories/IUserSessionRepository.cs

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+using Backend.Domain;
+
+namespace Backend.Repositories;
+
+public interface IUserSessionRepository
+{
+    Task<UserSession?> GetActiveByTokenAsync(string token, CancellationToken cancellationToken = default);
+    Task<int> CountRecentSessionsFromIpAsync(string ipAddress, DateTimeOffset since, CancellationToken cancellationToken = default);
+    void Add(UserSession session);
+    Task SaveChangesAsync(CancellationToken cancellationToken = default);
+}

Backend/Repositories/RiskFlagRepository.cs

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+using Backend.Data;
+using Backend.Domain;
+using Microsoft.EntityFrameworkCore;
+
+namespace Backend.Repositories;
+
+public sealed class RiskFlagRepository(AwardsDbContext dbContext) : IRiskFlagRepository
+{
+    public Task<bool> ExistsOpenRecentAsync(
+        int? seasonId,
+        string? twitchUserId,
+        string source,
+        string type,
+        string clientIp,
+        DateTimeOffset threshold,
+        CancellationToken cancellationToken = default) =>
+        dbContext.RiskFlags.AnyAsync(
+            item => item.Status == "open"
+                && item.Source == source
+                && item.Type == type
+                && item.TwitchUserId == twitchUserId
+                && item.CreatedFromIp == clientIp
+                && item.SeasonId == seasonId
+                && item.CreatedAt >= threshold,
+            cancellationToken);
+
+    public void Add(RiskFlag riskFlag) => dbContext.RiskFlags.Add(riskFlag);
+}

Backend/Repositories/UserSessionRepository.cs

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+using Backend.Data;
+using Backend.Domain;
+using Microsoft.EntityFrameworkCore;
+
+namespace Backend.Repositories;
+
+public sealed class UserSessionRepository(AwardsDbContext dbContext) : IUserSessionRepository
+{
+    public Task<UserSession?> GetActiveByTokenAsync(string token, CancellationToken cancellationToken = default) =>
+        dbContext.UserSessions.FirstOrDefaultAsync(
+            item => item.SessionToken == token && item.IsActive,
+            cancellationToken);
+
+    public Task<int> CountRecentSessionsFromIpAsync(string ipAddress, DateTimeOffset since, CancellationToken cancellationToken = default) =>
+        dbContext.UserSessions.CountAsync(
+            item => item.CreatedFromIp == ipAddress && item.CreatedAt >= since,
+            cancellationToken);
+
+    public void Add(UserSession session) => dbContext.UserSessions.Add(session);
+
+    public Task SaveChangesAsync(CancellationToken cancellationToken = default) =>
+        dbContext.SaveChangesAsync(cancellationToken);
+}