chore(humans): delete a dead repository read, and say why its neighbour stays

Core/Pgan.PoracleWebNet.Core.Abstractions/Repositories/IHumanRepository.cs

@@ -8,7 +8,6 @@ public interface IHumanRepository
 
     /// <summary>The webhook humans, id and name. Used to resolve a delegated webhook named by name.</summary>
     public Task<IEnumerable<Human>> GetWebhooksAsync();
-    public Task<Human?> GetByIdAsync(string id);
     public Task<IEnumerable<Human>> GetByIdsAsync(IEnumerable<string> ids);
     public Task<bool> ExistsAsync(string id);
     public Task<bool> DeleteUserAsync(string userId);

Core/Pgan.PoracleWebNet.Core.Repositories/HumanRepository.cs

@@ -23,12 +23,6 @@ public async Task<IEnumerable<Human>> GetWebhooksAsync()
         return entities.Select(e => e.ToModel());
     }
 
-    public async Task<Human?> GetByIdAsync(string id)
-    {
-        var entity = await this._context.Humans.FirstOrDefaultAsync(h => h.Id == id);
-        return entity is null ? null : entity.ToModel();
-    }
-
     public async Task<IEnumerable<Human>> GetByIdsAsync(IEnumerable<string> ids)
     {
         var idArray = ids.ToArray();

Core/Pgan.PoracleWebNet.Core.Services/UserPurgeService.cs

@@ -26,6 +26,11 @@ public partial class UserPurgeService(
 
     public async Task<bool> PurgeAsync(string userId)
     {
+        // Deliberately the DATABASE, not IHumanService.ExistsAsync, which is otherwise identical and
+        // already injected here. That one reads through the proxy, and the proxy answers null for any
+        // non-success -- so a Poracle that is merely unreachable is indistinguishable from an account
+        // that does not exist, and this method would answer false. The caller turns false into 404, so
+        // an outage would tell an admin the account they are deleting is already gone.
         if (!await this._humanRepository.ExistsAsync(userId))
         {
             return false;