✨ Social credit, leveling service

DysonNetwork.Pass/Credit/SocialCreditRecord.cs

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+using System.ComponentModel.DataAnnotations;
+using DysonNetwork.Shared.Data;
+using NodaTime;
+
+namespace DysonNetwork.Pass.Credit;
+
+public class SocialCreditRecord : ModelBase
+{
+    public Guid Id { get; set; }
+    [MaxLength(1024)] public string ReasonType { get; set; } = string.Empty;
+    [MaxLength(1024)] public string Reason { get; set; } = string.Empty;
+    public double Delta { get; set; }
+    public Instant? ExpiredAt { get; set; }
+    
+    public Guid AccountId { get; set; }
+    public Account.Account Account { get; set; } = null!;
+}

DysonNetwork.Pass/Credit/SocialCreditService.cs

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+using DysonNetwork.Shared.Cache;
+using Microsoft.EntityFrameworkCore;
+
+namespace DysonNetwork.Pass.Credit;
+
+public class SocialCreditService(AppDatabase db, ICacheService cache)
+{
+    private const string CacheKeyPrefix = "account:credits:";
+    
+    public async Task<SocialCreditRecord> AddRecord(string reasonType, string reason, double delta, Guid accountId)
+    {
+        var record = new SocialCreditRecord
+        {
+            ReasonType = reasonType,
+            Reason = reason,
+            Delta = delta,
+            AccountId = accountId,
+        };
+        db.SocialCreditRecords.Add(record);
+        await db.SaveChangesAsync();
+        return record;
+    }
+    
+    private const double BaseSocialCredit = 100;
+    
+    public async Task<double> GetSocialCredit(Guid accountId)
+    {
+        var cached = await cache.GetAsync<double?>($"{CacheKeyPrefix}{accountId}");
+        if (cached.HasValue) return cached.Value;
+        
+        var records = await db.SocialCreditRecords
+            .Where(x => x.AccountId == accountId)
+            .SumAsync(x => x.Delta);
+        records += BaseSocialCredit;
+        await cache.SetAsync($"{CacheKeyPrefix}{accountId}", records);
+        return records;
+    }
+}