[AZ-351][AZ-352][AZ-363] Refactor 03 batch 1: critical defensive fixes

AZ-351: Resolve ILogger<DatabaseMigrator> directly from DI in
Program.cs instead of casting ILogger<Program> (which always
returned null). Migrator now logs through Serilog at startup.

AZ-352: Drop empty catch in
RouteProcessingService.ExtractTileCoordinatesFromFilename. Convert
the method from private static to internal instance so it can use
the existing _logger (per coderule: side-effecting code must not be
static). Add typed null-guard via ArgumentNullException.ThrowIfNull
so unexpected exceptions propagate. Adds InternalsVisibleTo on the
RouteManagement csproj for SatelliteProvider.Tests, plus 4 unit
tests in RouteProcessingServiceTests.cs covering AC-1 (valid /
malformed / non-numeric) and AC-2 (null path propagation).

AZ-363: Delete _totalEnqueued / _totalDequeued fields and the two
non-atomic ++ writes in RegionRequestQueue. Fields were write-only
dead code and a thread-safety hazard.

Tests: 44/44 unit + 5/5 smoke (scripts/run-tests.sh --smoke).
Code review verdict: PASS, 0 findings, 0 auto-fix attempts.
Batch report: _docs/03_implementation/batch_07_report.md.

Co-authored-by: Cursor <cursoragent@cursor.com>

SatelliteProvider.Api/Program.cs

@@ -79,8 +79,8 @@ builder.Services.AddSwaggerGen(c =>
 
 var app = builder.Build();
 
-var logger = app.Services.GetRequiredService<ILogger<Program>>();
-var migrator = new DatabaseMigrator(connectionString, logger as ILogger<DatabaseMigrator>);
+var migratorLogger = app.Services.GetRequiredService<ILogger<DatabaseMigrator>>();
+var migrator = new DatabaseMigrator(connectionString, migratorLogger);
 if (!migrator.RunMigrations())
 {
     throw new Exception("Database migration failed. Application cannot start.");

SatelliteProvider.Services.RegionProcessing/RegionRequestQueue.cs

@@ -9,8 +9,6 @@ public class RegionRequestQueue : IRegionRequestQueue
 {
     private readonly Channel<RegionRequest> _queue;
     private readonly ILogger<RegionRequestQueue>? _logger;
-    private int _totalEnqueued = 0;
-    private int _totalDequeued = 0;
 
     public RegionRequestQueue(int capacity, ILogger<RegionRequestQueue>? logger = null)
     {
@@ -25,7 +23,6 @@ public class RegionRequestQueue : IRegionRequestQueue
 
     public async ValueTask EnqueueAsync(RegionRequest request, CancellationToken cancellationToken = default)
     {
-        _totalEnqueued++;
         await _queue.Writer.WriteAsync(request, cancellationToken);
     }
 
@@ -35,7 +32,6 @@ public class RegionRequestQueue : IRegionRequestQueue
         {
             if (_queue.Reader.TryRead(out var request))
             {
-                _totalDequeued++;
                 return request;
             }
         }

SatelliteProvider.Services.RouteManagement/RouteProcessingService.cs

@@ -607,25 +607,23 @@ public class RouteProcessingService : BackgroundService
         return earthRadiusMeters * c;
     }
 
-    private static (int TileX, int TileY) ExtractTileCoordinatesFromFilename(string filePath)
+    internal (int TileX, int TileY) ExtractTileCoordinatesFromFilename(string filePath)
     {
-        try
+        ArgumentNullException.ThrowIfNull(filePath);
+
+        var filename = Path.GetFileNameWithoutExtension(filePath);
+        var parts = filename.Split('_');
+
+        if (parts.Length >= 4 && parts[0] == "tile" &&
+            int.TryParse(parts[2], out var tileX) &&
+            int.TryParse(parts[3], out var tileY))
         {
-            var filename = Path.GetFileNameWithoutExtension(filePath);
-            var parts = filename.Split('_');
-            
-            if (parts.Length >= 4 && parts[0] == "tile")
-            {
-                if (int.TryParse(parts[2], out var tileX) && int.TryParse(parts[3], out var tileY))
-                {
-                    return (tileX, tileY);
-                }
-            }
+            return (tileX, tileY);
         }
-        catch
-        {
-        }
-        
+
+        _logger.LogWarning(
+            "Could not extract tile coordinates from filename {FilePath}; expected pattern tile_<timestamp>_<x>_<y>",
+            filePath);
         return (-1, -1);
     }
 

SatelliteProvider.Services.RouteManagement/SatelliteProvider.Services.RouteManagement.csproj

@@ -19,4 +19,8 @@
       <ProjectReference Include="..\SatelliteProvider.DataAccess\SatelliteProvider.DataAccess.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <InternalsVisibleTo Include="SatelliteProvider.Tests" />
+    </ItemGroup>
+
 </Project>

SatelliteProvider.Tests/RouteProcessingServiceTests.cs

@@ -0,0 +1,99 @@
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Moq;
+using SatelliteProvider.Common.Configs;
+using SatelliteProvider.DataAccess.Repositories;
+using SatelliteProvider.Services.RouteManagement;
+
+namespace SatelliteProvider.Tests;
+
+public class RouteProcessingServiceTests
+{
+    private static RouteProcessingService BuildSut(out Mock<ILogger<RouteProcessingService>> loggerMock)
+    {
+        loggerMock = new Mock<ILogger<RouteProcessingService>>();
+        var routeRepo = new Mock<IRouteRepository>();
+        var regionRepo = new Mock<IRegionRepository>();
+        var serviceProvider = new Mock<IServiceProvider>();
+        var storageOptions = Options.Create(new StorageConfig());
+
+        return new RouteProcessingService(
+            routeRepo.Object,
+            regionRepo.Object,
+            serviceProvider.Object,
+            storageOptions,
+            loggerMock.Object);
+    }
+
+    private static void VerifyWarningLogged(Mock<ILogger<RouteProcessingService>> loggerMock, string substringInState)
+    {
+        loggerMock.Verify(
+            l => l.Log(
+                LogLevel.Warning,
+                It.IsAny<EventId>(),
+                It.Is<It.IsAnyType>((state, _) => state.ToString()!.Contains(substringInState)),
+                It.IsAny<Exception?>(),
+                It.IsAny<Func<It.IsAnyType, Exception?, string>>()),
+            Times.AtLeastOnce);
+    }
+
+    [Fact]
+    public void ExtractTileCoordinatesFromFilename_ValidName_ReturnsParsedCoordinates_AC1()
+    {
+        // Arrange
+        var sut = BuildSut(out _);
+
+        // Act
+        var (x, y) = sut.ExtractTileCoordinatesFromFilename("/tiles/tile_1700000000_42_99.jpg");
+
+        // Assert
+        x.Should().Be(42);
+        y.Should().Be(99);
+    }
+
+    [Fact]
+    public void ExtractTileCoordinatesFromFilename_MalformedName_LogsWarningAndReturnsSentinel_AC1()
+    {
+        // Arrange
+        var sut = BuildSut(out var loggerMock);
+        const string malformed = "/tmp/not_a_tile_filename.jpg";
+
+        // Act
+        var (x, y) = sut.ExtractTileCoordinatesFromFilename(malformed);
+
+        // Assert
+        x.Should().Be(-1);
+        y.Should().Be(-1);
+        VerifyWarningLogged(loggerMock, "not_a_tile_filename");
+    }
+
+    [Fact]
+    public void ExtractTileCoordinatesFromFilename_TilePrefixWithNonNumericCoords_LogsWarningAndReturnsSentinel_AC1()
+    {
+        // Arrange
+        var sut = BuildSut(out var loggerMock);
+        const string nonNumeric = "/tiles/tile_1700000000_alpha_beta.jpg";
+
+        // Act
+        var (x, y) = sut.ExtractTileCoordinatesFromFilename(nonNumeric);
+
+        // Assert
+        x.Should().Be(-1);
+        y.Should().Be(-1);
+        VerifyWarningLogged(loggerMock, "tile_1700000000_alpha_beta");
+    }
+
+    [Fact]
+    public void ExtractTileCoordinatesFromFilename_NullPath_PropagatesArgumentNullException_AC2()
+    {
+        // Arrange
+        var sut = BuildSut(out _);
+
+        // Act
+        Action act = () => sut.ExtractTileCoordinatesFromFilename(null!);
+
+        // Assert
+        act.Should().Throw<ArgumentNullException>();
+    }
+}

_docs/02_tasks/_dependencies_table.md

@@ -30,9 +30,9 @@ Roadmap: `_docs/04_refactoring/03-code-quality-refactoring/analysis/refactoring_
 
 | Task | C-ID | Title | Phase | Depends On | Points | Status |
 |------|------|-------|-------|-----------|--------|--------|
-| AZ-351 | C01 | Fix null logger to DatabaseMigrator | 1 | — | 2 | To Do |
-| AZ-352 | C02 | Replace empty catch in ExtractTileCoordinatesFromFilename | 1 | — | 2 | To Do |
-| AZ-363 | C10 | Delete write-only counters in RegionRequestQueue | 1 | — | 1 | To Do |
+| AZ-351 | C01 | Fix null logger to DatabaseMigrator | 1 | — | 2 | Done (In Testing) |
+| AZ-352 | C02 | Replace empty catch in ExtractTileCoordinatesFromFilename | 1 | — | 2 | Done (In Testing) |
+| AZ-363 | C10 | Delete write-only counters in RegionRequestQueue | 1 | — | 1 | Done (In Testing) |
 | AZ-356 | C05 | Stub endpoints return 501 | 1 | — | 2 | To Do |
 | AZ-354 | C04 | Strict CORS by default | 1 | — | 2 | To Do |
 | AZ-353 | C03 | Sanitize 5xx responses via IExceptionHandler | 1 | — | 3 | To Do |

_docs/03_implementation/batch_07_report.md

@@ -0,0 +1,78 @@
+# Batch Report
+
+**Batch**: 7 (refactor 03-code-quality-refactoring · Phase 1 — critical defensive fixes, part 1/2)
+**Tasks**: AZ-351, AZ-352, AZ-363
+**Date**: 2026-05-10
+**Total Story Points**: 5 (2 + 2 + 1)
+
+## Task Results
+
+| Task | Status | Files Modified | Tests | AC Coverage | Issues |
+|------|--------|---------------|-------|-------------|--------|
+| AZ-351 Fix null logger to DatabaseMigrator | Done | 1 | 44/44 unit + 5/5 smoke | 2/2 ACs | None |
+| AZ-352 Replace empty catch in ExtractTileCoordinatesFromFilename | Done | 3 (svc + csproj + test) | 4 new + 44/44 unit + 5/5 smoke | 3/3 ACs | None |
+| AZ-363 Delete write-only counters in RegionRequestQueue | Done | 1 | 44/44 unit + 5/5 smoke | 2/2 ACs | None |
+
+## Files Changed
+
+- `SatelliteProvider.Api/Program.cs` (AZ-351)
+- `SatelliteProvider.Services.RegionProcessing/RegionRequestQueue.cs` (AZ-363)
+- `SatelliteProvider.Services.RouteManagement/RouteProcessingService.cs` (AZ-352)
+- `SatelliteProvider.Services.RouteManagement/SatelliteProvider.Services.RouteManagement.csproj` (AZ-352 — `InternalsVisibleTo` for test access)
+- `SatelliteProvider.Tests/RouteProcessingServiceTests.cs` (AZ-352 — new test file, 4 tests)
+
+## AC Test Coverage: All covered
+
+| Task | AC | Test |
+|------|----|------|
+| AZ-351 | AC-1 (migrator receives real logger) | covered by smoke startup — any smoke test exercises `app.Services.GetRequiredService<ILogger<DatabaseMigrator>>()` |
+| AZ-351 | AC-2 (tests stay green) | `scripts/run-tests.sh --smoke` passes (44 unit + 5 smoke) |
+| AZ-352 | AC-1 (malformed filename → warning + sentinel) | `ExtractTileCoordinatesFromFilename_MalformedName_LogsWarningAndReturnsSentinel_AC1`, `..._TilePrefixWithNonNumericCoords_..._AC1`, `..._ValidName_ReturnsParsedCoordinates_AC1` |
+| AZ-352 | AC-2 (unexpected exception propagates) | `ExtractTileCoordinatesFromFilename_NullPath_PropagatesArgumentNullException_AC2` |
+| AZ-352 | AC-3 (tests stay green) | smoke green |
+| AZ-363 | AC-1 (fields removed) | source verifies removal; `RegionRequestQueueTests` (4 tests) confirm queue behavior unchanged |
+| AZ-363 | AC-2 (tests stay green) | smoke green |
+
+## Code Review Verdict: PASS
+
+### Phase 2 (Spec Compliance)
+- All ACs satisfied with executed tests.
+- No scope creep: each task touched only files declared in the change spec.
+
+### Phase 3 (Code Quality)
+- AZ-352 conversion `private static` → `internal` instance method aligns with `coderule.mdc` (side-effecting code must not be `static`).
+- No new bare/empty catch blocks introduced.
+- `ArgumentNullException.ThrowIfNull` used (modern .NET pattern).
+
+### Phase 4 (Security)
+- No new external input handling. Filename in log entry is local filesystem, not user-controlled secrets.
+
+### Phase 5 (Performance)
+- AZ-363 removes two non-atomic `++` ops; marginal positive (eliminates contended writes).
+
+### Phase 6 (Cross-Task Consistency)
+- Three tasks touch three disjoint components (Api, RouteManagement, RegionProcessing). Zero interaction.
+
+### Phase 7 (Architecture Compliance)
+- All edits stay within the owning component's `Owns` glob.
+- `InternalsVisibleTo("SatelliteProvider.Tests")` added to RouteManagement — test-discovery hatch, not a compile-time consumer relation; does not violate Layer 3 sibling rule.
+- Module-layout note "Internal: (none)" for RouteManagement is now slightly out-of-date (one method became `internal`). Deferred to AZ-315 docs sync (already In Progress).
+
+## Auto-Fix Attempts: 0
+## Stuck Agents: None
+
+## Tracker Status (post-batch)
+
+| Task | Pre-batch | Post-batch (after commit) |
+|------|-----------|---------------------------|
+| AZ-351 | In Progress | → In Testing |
+| AZ-352 | In Progress | → In Testing |
+| AZ-363 | In Progress | → In Testing |
+
+## Next Batch
+
+**Batch 8** (Phase 1 part 2): AZ-356 (501 stubs), AZ-354 (strict CORS), AZ-353 (sanitize 5xx via IExceptionHandler) — 7 story points, 3 tasks, all WebApi component.
+
+## Commit
+
+`[AZ-351][AZ-352][AZ-363] Refactor 03 batch 1: critical defensive fixes` (commit hash recorded post-commit).

_docs/_autodev_state.md

@@ -8,7 +8,7 @@ status: in_progress
 sub_step:
   phase: 4
   name: execution
-  detail: "RUN_DIR=03-code-quality-refactoring; safety net green (40 unit + 5 smoke); epic AZ-350; 27 tickets (AZ-351..AZ-380, gaps at 355/358/361); /implement starting batch 1"
+  detail: "RUN_DIR=03-code-quality-refactoring; epic AZ-350; batch 7 done (AZ-351/352/363, 5 SP); 24 tickets remaining; next batch 8 = AZ-356/354/353 (Phase 1 part 2, 7 SP, WebApi)"
 retry_count: 0
 cycle: 1
 tracker: jira