Adding Admin API

src/api/MicCheck.Api/Features/FeatureStateService.cs

@@ -0,0 +1,46 @@
+using MicCheck.Api.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace MicCheck.Api.Features;
+
+public class FeatureStateService(MicCheckDbContext db)
+{
+    public async Task<IReadOnlyList<FeatureState>> ListByEnvironmentAsync(int environmentId, CancellationToken ct = default)
+    {
+        return await db.FeatureStates
+            .Where(fs => fs.EnvironmentId == environmentId && fs.IdentityId == null && fs.FeatureSegmentId == null)
+            .ToListAsync(ct);
+    }
+
+    public async Task<FeatureState?> FindByIdAsync(int id, int environmentId, CancellationToken ct = default)
+    {
+        return await db.FeatureStates
+            .FirstOrDefaultAsync(fs => fs.Id == id && fs.EnvironmentId == environmentId, ct);
+    }
+
+    public async Task<FeatureState> UpdateAsync(int id, bool enabled, string? value, CancellationToken ct = default)
+    {
+        var state = await db.FeatureStates.FirstOrDefaultAsync(fs => fs.Id == id, ct)
+            ?? throw new KeyNotFoundException($"FeatureState {id} not found.");
+
+        state.Enabled = enabled;
+        state.Value = value;
+        state.UpdatedAt = DateTimeOffset.UtcNow;
+        state.Version++;
+        await db.SaveChangesAsync(ct);
+        return state;
+    }
+
+    public async Task<FeatureState> PatchAsync(int id, bool? enabled, string? value, CancellationToken ct = default)
+    {
+        var state = await db.FeatureStates.FirstOrDefaultAsync(fs => fs.Id == id, ct)
+            ?? throw new KeyNotFoundException($"FeatureState {id} not found.");
+
+        if (enabled.HasValue) state.Enabled = enabled.Value;
+        if (value is not null) state.Value = value;
+        state.UpdatedAt = DateTimeOffset.UtcNow;
+        state.Version++;
+        await db.SaveChangesAsync(ct);
+        return state;
+    }
+}