[AZ-1126] Migrate capturedAt to DateTimeOffset

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

SatelliteProvider.Api/Validators/UavTileMetadataValidator.cs

@@ -54,9 +54,9 @@ public sealed class UavTileMetadataValidator : AbstractValidator<UavTileMetadata
         // time per call (rule executes at validation time, not constructor
         // time). Equivalent to AZ-488 Rule 4 in UavTileQualityGate.
         RuleFor(m => m.CapturedAt)
-            .Must(capturedAt => capturedAt.ToUniversalTime() <= tp.GetUtcNow().UtcDateTime.AddSeconds(futureSkewSeconds))
+            .Must(capturedAt => capturedAt.UtcDateTime <= tp.GetUtcNow().UtcDateTime.AddSeconds(futureSkewSeconds))
                 .WithMessage($"`capturedAt` must be within {futureSkewSeconds}s of the current time (no future-dated tiles).")
-            .Must(capturedAt => capturedAt.ToUniversalTime() >= tp.GetUtcNow().UtcDateTime.AddDays(-maxAgeDays))
+            .Must(capturedAt => capturedAt.UtcDateTime >= tp.GetUtcNow().UtcDateTime.AddDays(-maxAgeDays))
                 .WithMessage($"`capturedAt` must be within the last {maxAgeDays} days.");
 
         // `FlightId` is intentionally not validated beyond JSON shape — AZ-503

SatelliteProvider.Api/Validators/UavUploadValidationFilter.cs

@@ -73,11 +73,12 @@ public sealed class UavUploadValidationFilter : IEndpointFilter
         {
             payload = JsonSerializer.Deserialize<UavTileBatchMetadataPayload>(metadataField, _jsonOptions);
         }
-        catch (JsonException)
+        catch (JsonException ex)
         {
+            var message = string.IsNullOrWhiteSpace(ex.Message) ? MetadataJsonParseError : ex.Message;
             return Results.ValidationProblem(new Dictionary<string, string[]>
             {
-                [MetadataField] = new[] { MetadataJsonParseError },
+                [MetadataField] = new[] { message },
             });
         }
 

SatelliteProvider.Common/DTO/UavTileMetadata.cs

@@ -1,10 +1,11 @@
 using System.Text.Json.Serialization;
+using SatelliteProvider.Common.Json;
 
 namespace SatelliteProvider.Common.DTO;
 
-// AZ-488 / `uav-tile-upload.md` v1.0.0 — per-tile metadata supplied with each
+// AZ-488 / `uav-tile-upload.md` — per-tile metadata supplied with each batch
-// batch item. `CapturedAt` is normalized to UTC by the upload handler before
+// item. `CapturedAt` is UTC-aware (`DateTimeOffset`) and normalized to UTC
-// reaching the persistence layer.
+// before persistence (AZ-1126 / F-AZ810-2).
 //
 // AZ-503: `FlightId` is optional. When provided, two UAVs uploading the same
 // (z, x, y) cell from different flights coexist as distinct DB rows and write
@@ -27,7 +28,8 @@ public record UavTileMetadata
     [JsonRequired]
     public double TileSizeMeters { get; init; }
     [JsonRequired]
-    public DateTime CapturedAt { get; init; }
+    [JsonConverter(typeof(UtcOffsetRequiredDateTimeOffsetConverter))]
+    public DateTimeOffset CapturedAt { get; init; }
     public Guid? FlightId { get; init; }
 }
 

SatelliteProvider.Common/Json/UtcOffsetRequiredDateTimeOffsetConverter.cs

@@ -0,0 +1,43 @@
+using System.Globalization;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Text.RegularExpressions;
+
+namespace SatelliteProvider.Common.Json;
+
+public sealed partial class UtcOffsetRequiredDateTimeOffsetConverter : JsonConverter<DateTimeOffset>
+{
+    [GeneratedRegex(@"T\d{2}:\d{2}(:\d{2}(\.\d+)?)?(Z|[+-]\d{2}:\d{2}|[+-]\d{4})$", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant)]
+    private static partial Regex ExplicitOffsetPattern();
+
+    public override DateTimeOffset Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType != JsonTokenType.String)
+        {
+            throw new JsonException("`capturedAt` must be an ISO-8601 string with an explicit UTC offset.");
+        }
+
+        var raw = reader.GetString();
+        if (string.IsNullOrWhiteSpace(raw))
+        {
+            throw new JsonException("`capturedAt` must be an ISO-8601 string with an explicit UTC offset.");
+        }
+
+        if (!ExplicitOffsetPattern().IsMatch(raw))
+        {
+            throw new JsonException("`capturedAt` must include an explicit UTC offset (for example `Z` or `+00:00`).");
+        }
+
+        if (!DateTimeOffset.TryParse(raw, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind, out var parsed))
+        {
+            throw new JsonException("`capturedAt` could not be parsed as an ISO-8601 timestamp.");
+        }
+
+        return parsed.ToUniversalTime();
+    }
+
+    public override void Write(Utf8JsonWriter writer, DateTimeOffset value, JsonSerializerOptions options)
+    {
+        writer.WriteStringValue(value.ToUniversalTime().ToString("O", CultureInfo.InvariantCulture));
+    }
+}

SatelliteProvider.IntegrationTests/UavUploadValidationTests.cs

@@ -91,6 +91,9 @@ public static class UavUploadValidationTests
         // Rule 14: type mismatch (lat as string)
         await ItemLatTypeMismatch_Returns400(apiUrl, secret);
 
+        // AZ-1126: offset-less capturedAt rejected at deserializer
+        await ItemCapturedAtOffsetLess_Returns400(apiUrl, secret);
+
         Console.WriteLine("✓ UAV upload metadata validation tests: PASSED");
     }
 
@@ -429,6 +432,33 @@ public static class UavUploadValidationTests
         Console.WriteLine("  ✓ items[0].capturedAt = now-60d rejected with indexed errors path");
     }
 
+    private static async Task ItemCapturedAtOffsetLess_Returns400(string apiUrl, string secret)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-1126 AC-2: per-item capturedAt without explicit UTC offset → HTTP 400");
+
+        // Arrange
+        var coord = NextTestCoordinate();
+        var metadata = new
+        {
+            items = new[]
+            {
+                new { latitude = coord.Latitude, longitude = coord.Longitude, tileZoom = 18, tileSizeMeters = 200.0, capturedAt = "2026-06-26T12:00:00" },
+            },
+        };
+        using var client = CreateClientWithGpsToken(apiUrl, secret);
+
+        // Act
+        using var response = await PostBatch(client, metadata, new[] { CreateValidJpeg() });
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-1126 item capturedAt offset-less");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-1126 item capturedAt offset-less");
+        ProblemDetailsAssertions.AssertErrorsContainsMention(problem, expectedMention: "capturedAt", label: "AZ-1126 item capturedAt offset-less");
+
+        Console.WriteLine("  ✓ items[0].capturedAt without offset rejected");
+    }
+
     private static async Task ItemFlightIdMalformed_Returns400(string apiUrl, string secret)
     {
         Console.WriteLine();

SatelliteProvider.Services.TileDownloader/UavTileQualityGate.cs

@@ -80,9 +80,7 @@ public sealed class UavTileQualityGate : IUavTileQualityGate
         // Rule 4 (Captured-at age): forbid future timestamps beyond clock skew and
         // reject anything older than the configured max age.
         var now = _timeProvider.GetUtcNow().UtcDateTime;
-        var capturedAt = metadata.CapturedAt.Kind == DateTimeKind.Utc
+        var capturedAt = metadata.CapturedAt.UtcDateTime;
-            ? metadata.CapturedAt
-            : metadata.CapturedAt.ToUniversalTime();
 
         if (capturedAt > now.AddSeconds(_qualityConfig.CapturedAtFutureSkewSeconds))
         {

SatelliteProvider.Services.TileDownloader/UavTileUploadHandler.cs

@@ -157,9 +157,7 @@ public sealed class UavTileUploadHandler : IUavTileUploadHandler
         var imageArray = imageBytes.ToArray();
         await File.WriteAllBytesAsync(filePath, imageArray, cancellationToken);
 
-        var capturedAtUtc = metadata.CapturedAt.Kind == DateTimeKind.Utc
+        var capturedAtUtc = metadata.CapturedAt.UtcDateTime;
-            ? metadata.CapturedAt
-            : metadata.CapturedAt.ToUniversalTime();
         var now = _timeProvider.GetUtcNow().UtcDateTime;
 
         // AZ-503: deterministic id from (z, x, y, source, flight_id-or-zero) and

SatelliteProvider.Tests/Json/UtcOffsetRequiredDateTimeOffsetConverterTests.cs

@@ -0,0 +1,45 @@
+using System.Text.Json;
+using FluentAssertions;
+using SatelliteProvider.Common.DTO;
+using SatelliteProvider.Common.Json;
+
+namespace SatelliteProvider.Tests.Json;
+
+public class UtcOffsetRequiredDateTimeOffsetConverterTests
+{
+    private static readonly JsonSerializerOptions Options = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        Converters = { new UtcOffsetRequiredDateTimeOffsetConverter() },
+    };
+
+    [Theory]
+    [InlineData("\"2026-06-26T12:00:00Z\"")]
+    [InlineData("\"2026-06-26T12:00:00+00:00\"")]
+    [InlineData("\"2026-06-26T12:00:00.1234567Z\"")]
+    public void Deserialize_ExplicitUtcOffset_Parses(string capturedAtJson)
+    {
+        // Arrange
+        var json = $$"""{"latitude":50.1,"longitude":36.1,"tileZoom":18,"tileSizeMeters":200,"capturedAt":{{capturedAtJson}}}""";
+
+        // Act
+        var metadata = JsonSerializer.Deserialize<UavTileMetadata>(json, Options);
+
+        // Assert
+        metadata.Should().NotBeNull();
+        metadata!.CapturedAt.Offset.Should().Be(TimeSpan.Zero);
+    }
+
+    [Fact]
+    public void Deserialize_OffsetLessIsoString_ThrowsJsonException()
+    {
+        // Arrange
+        const string json = """{"latitude":50.1,"longitude":36.1,"tileZoom":18,"tileSizeMeters":200,"capturedAt":"2026-06-26T12:00:00"}""";
+
+        // Act
+        var act = () => JsonSerializer.Deserialize<UavTileMetadata>(json, Options);
+
+        // Assert
+        act.Should().Throw<JsonException>().WithMessage("*explicit UTC offset*");
+    }
+}

SatelliteProvider.Tests/UavTileQualityGateTests.cs

@@ -114,7 +114,7 @@ public class UavTileQualityGateTests
         var now = new DateTime(2026, 5, 11, 12, 0, 0, DateTimeKind.Utc);
         var gate = BuildGate(timeProvider: new FixedTimeProvider(now));
         var bytes = UavTileImageFactory.CreateRandomJpeg();
-        var metadata = ValidMetadata() with { CapturedAt = now.AddHours(1) };
+        var metadata = ValidMetadata() with { CapturedAt = new DateTimeOffset(now.AddHours(1), TimeSpan.Zero) };
 
         // Act
         var result = gate.Validate(bytes, JpegContentType, metadata);
@@ -131,7 +131,7 @@ public class UavTileQualityGateTests
         var now = new DateTime(2026, 5, 11, 12, 0, 0, DateTimeKind.Utc);
         var gate = BuildGate(timeProvider: new FixedTimeProvider(now));
         var bytes = UavTileImageFactory.CreateRandomJpeg();
-        var metadata = ValidMetadata() with { CapturedAt = now.AddDays(-8) };
+        var metadata = ValidMetadata() with { CapturedAt = new DateTimeOffset(now.AddDays(-8), TimeSpan.Zero) };
 
         // Act
         var result = gate.Validate(bytes, JpegContentType, metadata);
@@ -148,7 +148,7 @@ public class UavTileQualityGateTests
         var now = new DateTime(2026, 5, 11, 12, 0, 0, DateTimeKind.Utc);
         var gate = BuildGate(timeProvider: new FixedTimeProvider(now));
         var bytes = UavTileImageFactory.CreateRandomJpeg();
-        var metadata = ValidMetadata() with { CapturedAt = now.AddSeconds(20) };
+        var metadata = ValidMetadata() with { CapturedAt = new DateTimeOffset(now.AddSeconds(20), TimeSpan.Zero) };
 
         // Act
         var result = gate.Validate(bytes, JpegContentType, metadata);
@@ -216,7 +216,7 @@ public class UavTileQualityGateTests
         Longitude = 37.647063,
         TileZoom = 18,
         TileSizeMeters = 200.0,
-        CapturedAt = new DateTime(2026, 5, 11, 11, 30, 0, DateTimeKind.Utc),
+        CapturedAt = new DateTimeOffset(2026, 5, 11, 11, 30, 0, TimeSpan.Zero),
     };
 
     private sealed class FixedTimeProvider : TimeProvider

SatelliteProvider.Tests/UavTileUploadHandlerTests.cs

@@ -275,7 +275,7 @@ public class UavTileUploadHandlerTests : IDisposable
         Longitude = 37.647063,
         TileZoom = 18,
         TileSizeMeters = 200.0,
-        CapturedAt = new DateTime(2026, 5, 11, 11, 30, 0, DateTimeKind.Utc),
+        CapturedAt = new DateTimeOffset(2026, 5, 11, 11, 30, 0, TimeSpan.Zero),
     };
 
     private sealed class FixedTimeProvider : TimeProvider

SatelliteProvider.Tests/Validators/UavTileBatchMetadataPayloadValidatorTests.cs

@@ -11,7 +11,7 @@ namespace SatelliteProvider.Tests.Validators;
 public class UavTileBatchMetadataPayloadValidatorTests
 {
     private readonly UavTileBatchMetadataPayloadValidator _validator;
-    private readonly DateTime _now;
+    private readonly DateTimeOffset _now;
 
     public UavTileBatchMetadataPayloadValidatorTests()
     {
@@ -22,7 +22,7 @@ public class UavTileBatchMetadataPayloadValidatorTests
             MaxAgeDays = 7,
             CapturedAtFutureSkewSeconds = 30,
         });
-        _now = new DateTime(2026, 5, 22, 12, 0, 0, DateTimeKind.Utc);
+        _now = new DateTimeOffset(2026, 5, 22, 12, 0, 0, TimeSpan.Zero);
         _validator = new UavTileBatchMetadataPayloadValidator(config, new FixedTimeProvider(_now));
     }
 
@@ -96,8 +96,8 @@ public class UavTileBatchMetadataPayloadValidatorTests
 
     private sealed class FixedTimeProvider : TimeProvider
     {
-        private readonly DateTime _utcNow;
+        private readonly DateTimeOffset _utcNow;
-        public FixedTimeProvider(DateTime utcNow) => _utcNow = utcNow;
+        public FixedTimeProvider(DateTimeOffset utcNow) => _utcNow = utcNow;
-        public override DateTimeOffset GetUtcNow() => new(_utcNow, TimeSpan.Zero);
+        public override DateTimeOffset GetUtcNow() => _utcNow;
     }
 }

SatelliteProvider.Tests/Validators/UavTileMetadataValidatorTests.cs

@@ -13,7 +13,7 @@ namespace SatelliteProvider.Tests.Validators;
 public class UavTileMetadataValidatorTests
 {
     private readonly UavTileMetadataValidator _validator;
-    private readonly DateTime _now;
+    private readonly DateTimeOffset _now;
 
     public UavTileMetadataValidatorTests()
     {
@@ -23,7 +23,7 @@ public class UavTileMetadataValidatorTests
             MaxAgeDays = 7,
             CapturedAtFutureSkewSeconds = 30,
         });
-        _now = new DateTime(2026, 5, 22, 12, 0, 0, DateTimeKind.Utc);
+        _now = new DateTimeOffset(2026, 5, 22, 12, 0, 0, TimeSpan.Zero);
         _validator = new UavTileMetadataValidator(config, new FixedTimeProvider(_now));
     }
 
@@ -32,12 +32,12 @@ public class UavTileMetadataValidatorTests
     // consumer appears, promote to SatelliteProvider.TestSupport.
     private sealed class FixedTimeProvider : TimeProvider
     {
-        private readonly DateTime _utcNow;
+        private readonly DateTimeOffset _utcNow;
-        public FixedTimeProvider(DateTime utcNow) => _utcNow = utcNow;
+        public FixedTimeProvider(DateTimeOffset utcNow) => _utcNow = utcNow;
-        public override DateTimeOffset GetUtcNow() => new(_utcNow, TimeSpan.Zero);
+        public override DateTimeOffset GetUtcNow() => _utcNow;
     }
 
-    private static UavTileMetadata ValidMetadata(DateTime capturedAt) => new()
+    private static UavTileMetadata ValidMetadata(DateTimeOffset capturedAt) => new()
     {
         Latitude = 50.10,
         Longitude = 36.10,

_docs/02_document/contracts/api/uav-tile-upload.md

@@ -4,7 +4,7 @@
 **Producer task**: AZ-488 — `_docs/02_tasks/done/AZ-488_uav_tile_upload.md`
 **Extended by**: AZ-503 — `_docs/02_tasks/done/AZ-503_tile_identity_uuidv5_bulk_list.md` (added optional `flightId` per-item field; per-flight on-disk path; deterministic `tileId`)
 **Consumer tasks**: `gps-denied-onboard`, mission planner UI, any future UAV-equipped client
-**Version**: 1.2.0
+**Version**: 1.2.1
 **Status**: frozen
 **Last Updated**: 2026-05-23
 
@@ -39,7 +39,7 @@ Multipart form fields (case-sensitive part names):
 | `longitude` | number | yes | Geographic longitude of the tile center | WGS-84 decimal degrees |
 | `tileZoom` | integer | yes | Slippy Map zoom level | Must satisfy the same zoom-level policy as the existing tile pipeline (see `MapConfig.AllowedZoomLevels`) |
 | `tileSizeMeters` | number | yes | Tile size in meters at the captured latitude | Producer-supplied |
-| `capturedAt` | string (ISO-8601 UTC) | yes | Moment of UAV image capture | Must satisfy the captured-at rule (see Quality Gate, Rule 4) |
+| `capturedAt` | string (ISO-8601 with explicit UTC offset) | yes | Moment of UAV image capture | Must include an explicit offset (`Z` or `+00:00`); offset-less timestamps are rejected. Must satisfy the captured-at rule (see Quality Gate, Rule 4) |
 | `flightId` | string (UUID) | no | AZ-503: optional flight identifier. When present, two flights uploading the same cell coexist as separate rows; absent uploads share a single anonymous row per cell. Omitting the field is fully backward-compatible with v1.0.0 clients. | RFC 4122 UUID. Backward-compatible default: `null` |
 
 Field names are camelCase. Property-name matching is case-insensitive on read.
@@ -238,3 +238,4 @@ Each version bump requires updating the Change Log and notifying every consumer
 | 1.0.0 | 2026-05-11 | Initial contract — batch UAV upload endpoint, 5-rule quality gate, per-source UPSERT, closed reject-reason enum, GPS-permission requirement. Produced by AZ-488. | autodev (cycle 2 step 10) |
 | 1.1.0 | 2026-05-12 | Minor bump for AZ-503: added optional `flightId` per-item metadata field (backward-compatible default `null`); `tileId` in the response is now a deterministic UUIDv5 derived from `(z, x, y, source, flightId)` instead of a random Guid; on-disk path adds a `{flightId or 'none'}` segment for per-flight evidence isolation. No reject-reason changes, no envelope changes, no permission changes. v1.0.0 clients omitting `flightId` keep working unchanged. | autodev (cycle 5 step 13) |
 | 1.2.0 | 2026-05-23 | Minor bump for AZ-810: added the **metadata validation** layer (14 rules) wired through a new `UavUploadValidationFilter` that runs BEFORE the per-item Quality Gate. Marks every non-optional metadata axis with `[JsonRequired]`; uses `UnmappedMemberHandling.Disallow` so unknown root/nested fields are rejected. HTTP 400 envelope-error body now matches the shared `ValidationProblemDetails` shape per `error-shape.md` v1.0.0. **Behavior change**: callers previously sending malformed metadata that silently coerced (e.g. `latitude: 0` for a missing field) now receive HTTP 400 instead of HTTP 200 + per-item rejection. No wire-format renames, no reject-reason changes, no permission changes. The Quality Gate (5 rules) is unchanged and continues as defence-in-depth. | autodev (cycle 8 batch 4) |
+| 1.2.1 | 2026-06-26 | Patch for AZ-1126 / F-AZ810-2: `capturedAt` is typed as `DateTimeOffset` at the metadata DTO layer. Offset-less ISO-8601 strings (e.g. `"2026-06-26T12:00:00"` without `Z` or `+00:00`) are rejected at deserialization with HTTP 400. Compliant clients already sending `Z`-suffixed timestamps are unchanged. Closes security finding F-AZ810-2. | autodev (cycle 13) |

_docs/02_tasks/_dependencies_table.md

@@ -269,7 +269,7 @@ Step 9 cycle 13: 1 task created (AZ-1126 = 2 pts) — `DateTime` → `DateTimeOf
 
 | Task | Depends On | Points | Status |
 |------|-----------|--------|--------|
-| AZ-1126 capturedAt DateTimeOffset (F-AZ810-2) | AZ-810, AZ-488 | 2 | Todo |
+| AZ-1126 capturedAt DateTimeOffset (F-AZ810-2) | AZ-810, AZ-488 | 2 | Done (In Testing) |
 
 ## Coverage Verification
 

_docs/03_implementation/batch_01_cycle13_report.md

@@ -0,0 +1,37 @@
+# Batch Report
+
+**Batch**: 1
+**Tasks**: AZ-1126_captured_at_datetimeoffset
+**Date**: 2026-06-26
+**Cycle**: 13
+
+## Task Results
+
+| Task | Status | Files Modified | Tests | AC Coverage | Issues |
+|------|--------|---------------|-------|-------------|--------|
+| AZ-1126 | Done | 12 files | pass | 4/4 ACs covered | None |
+
+## AC Test Coverage: All covered
+
+| AC | Evidence |
+|----|----------|
+| AC-1 | `UavTileMetadataValidatorTests`, `UavTileQualityGateTests`, `UavTileUploadHandlerTests` |
+| AC-2 | `UtcOffsetRequiredDateTimeOffsetConverterTests`, `UavUploadValidationTests.ItemCapturedAtOffsetLess_Returns400` |
+| AC-3 | `UavUploadValidationTests.HappyPath_Returns200`, existing `UavUploadTests` suite |
+| AC-4 | `uav-tile-upload.md` v1.2.1 change log |
+
+## Code Review Verdict: PASS_WITH_WARNINGS
+
+Self-review: type migration is localized; filter now surfaces `JsonException.Message` for metadata parse failures (improves flightId and capturedAt diagnostics). No architecture drift.
+
+## Auto-Fix Attempts: 1
+
+Integration test initially failed because `UavUploadValidationFilter` replaced all `JsonException` messages with a generic parse error; fixed by propagating the converter message.
+
+## Stuck Agents: None
+
+## Full Test Run
+
+`./scripts/run-tests.sh` (mode=full) — all unit + integration tests passed after filter fix.
+
+## Next Batch: All tasks complete

_docs/03_implementation/implementation_completeness_cycle13_report.md

@@ -0,0 +1,16 @@
+# Product Implementation Completeness — Cycle 13
+
+**Date**: 2026-06-26
+**Cycle**: 13
+
+## Per-Task Classification
+
+| Task | Verdict | Evidence |
+|------|---------|----------|
+| AZ-1126 | PASS | `UavTileMetadata.CapturedAt` is `DateTimeOffset` with `UtcOffsetRequiredDateTimeOffsetConverter`; validator, quality gate, and upload handler compare via `UtcDateTime`; contract patched to 1.2.1; integration + unit tests green |
+
+## System Pipeline Audit
+
+No new end-to-end pipelines introduced. UAV upload pipeline remains WIRED (filter → handler → quality gate → repository).
+
+## Gate Verdict: PASS

_docs/03_implementation/implementation_report_captured_at_datetimeoffset_cycle13.md

@@ -0,0 +1,26 @@
+# Implementation Report — capturedAt DateTimeOffset (Cycle 13)
+
+**Cycle**: 13
+**Tasks**: AZ-1126
+**Date**: 2026-06-26
+
+## Summary
+
+Migrated `UavTileMetadata.CapturedAt` from `DateTime` to `DateTimeOffset` with a strict JSON converter requiring explicit UTC offsets. Closes security finding F-AZ810-2.
+
+## Changes
+
+- `UtcOffsetRequiredDateTimeOffsetConverter` rejects offset-less ISO-8601 strings at deserialization
+- FluentValidation freshness rules and quality gate use `UtcDateTime` without `DateTimeKind` branching
+- `UavUploadValidationFilter` propagates `JsonException.Message` for metadata parse failures
+- Contract `uav-tile-upload.md` 1.2.0 → 1.2.1
+
+## Test Evidence
+
+- Unit: `UtcOffsetRequiredDateTimeOffsetConverterTests`, updated UAV validator/gate/handler tests
+- Integration: `UavUploadValidationTests.ItemCapturedAtOffsetLess_Returns400`
+- Full suite: `./scripts/run-tests.sh` passed (mode=full)
+
+## Handoff
+
+Full test suite already executed in Step 10; Step 11 (Run Tests) may treat this as pre-verified per implement skill Step 16 handoff.

_docs/_autodev_state.md

@@ -2,21 +2,23 @@
 
 ## Current Step
 flow: existing-code
-step: 10
+step: 11
-name: Implement
+name: Run Tests
-status: in_progress
+status: not_started
 sub_step:
-  phase: 1
+  phase: 0
-  name: parse
+  name: awaiting-invocation
   detail: ""
 retry_count: 0
-cycle: 12
+cycle: 13
 tracker: jira
 auto_push: true
 
 ## Last Completed Cycle
-cycle: 11
+cycle: 12
-step_16_deploy: completed
+step_14_security: skipped
-step_16_5_release: skipped (no release harness)
+step_15_perf: completed
+step_16_deploy: skipped
+step_16_5_release: skipped
 step_17_retrospective: completed
-verdict: cycle_complete_operator_deploy
+verdict: cycle_complete