Handle duplicate setting, feature and permission records

[maliming]

Resolve #26208

SettingManagementStore and FeatureManagementStore no longer throw on duplicate records: reads use the record FindAsync returns and saves delete the extra ones. Revoking a permission now deletes all matching grants.

Concurrent first saves can still insert duplicate rows. The unique index doesn't cover rows with a NULL ProviderKey, because EF Core adds an IS NOT NULL filter to it on SQL Server. On SQL Server, you can stop this at the database level:

1. Remove the existing duplicates first, otherwise the migration will fail. This lists them with their values:

SELECT s.Id, s.Name, s.ProviderName, s.Value
FROM AbpSettings s
WHERE s.ProviderKey IS NULL
  AND EXISTS (
      SELECT 1 FROM AbpSettings d
      WHERE d.ProviderKey IS NULL
        AND d.Name = s.Name
        AND d.ProviderName = s.ProviderName
        AND d.Id <> s.Id)
ORDER BY s.Name, s.ProviderName;

Keep one row for each setting (the one with the value you want) and delete the others by Id.

2. Add a filtered unique index in your own DbContext, after builder.ConfigureSettingManagement(), then add a new migration:

builder.Entity<Setting>(b =>
{
    b.HasIndex(x => new { x.Name, x.ProviderName })
        .IsUnique()
        .HasFilter("[ProviderKey] IS NULL");
});

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[codecov]

Codecov Report

❌ Patch coverage is 69.70954% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.95%. Comparing base (c80c6f8) to head (769ccc4).
⚠️ Report is 33 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ment/ResourcePermissionManagementProvider_Tests.cs	0.00%	30 Missing ⚠️
...ssionManagement/ResourcePermissionManager_Tests.cs	0.00%	30 Missing ⚠️
...onManagement/PermissionManagementProvider_Tests.cs	0.00%	11 Missing ⚠️
...lo/Abp/FeatureManagement/FeatureManagementStore.cs	97.22%	0 Missing and 1 partial ⚠️
...lo/Abp/SettingManagement/SettingManagementStore.cs	97.95%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #26209      +/-   ##
==========================================
+ Coverage   49.90%   49.95%   +0.04%     
==========================================
  Files        3842     3843       +1     
  Lines      135458   135679     +221     
  Branches    10271    10282      +11     
==========================================
+ Hits        67597    67774     +177     
- Misses      65823    65867      +44     
  Partials     2038     2038              

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[Copilot]

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🟢 Approval recommended

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