fix(workorders): persist manual POC override with audit and site-follow (SH-379)

Editing a work order's POC never reached the backend: no update path wrote
PocName/PocPhone/PocNotes, so the optimistic UI edit was lost on refetch and
the completion freeze captured the Site contact instead of the manual value,
and nothing was audited.

- Add tenant-scoped PATCH api/workorders/{id}/poc via new WorkOrderPocService
  + WorkOrderPocDataService: persists the override, stages FieldChanged audit
  entries (which also write field locks so sync never overwrites a manual POC),
  and enforces row-version concurrency and terminal-status read-only rules.
- Lock semantics (SH-190): a manual POC away from the Site's live contacts is
  stored WO-level; an edit equal to a live Site contact (or blanking name+phone)
  stores nothing so the WO follows the Site. PocCustomized exposes the state.
- Board projection, completion freeze and create now share one Site-contact
  fallback (first non-deleted contact by SiteContactOrder) so a never-overridden
  WO keeps following the Site, including at create when the wizard prefills it.
- Route contract baseline gains PATCH {id:int}/poc.

Api.SeaHavenIndustries.Tests/WorkOrderControllerSearchTests.cs

@@ -23,6 +23,7 @@ public class WorkOrderControllerSearchTests
             Mock.Of<IWorkOrderBoardUpdateService>(),
             Mock.Of<IWorkOrderBoardCreateService>(),
             Mock.Of<IWorkOrderBoardCancelService>(),
+            Mock.Of<IWorkOrderPocService>(),
             advancedSearch);
 
         controller.ControllerContext = new ControllerContext

Api.SeaHavenIndustries.Tests/WorkOrderRouteContractTests.cs

@@ -71,6 +71,7 @@ public class WorkOrderRouteContractTests
         "PATCH {id:int}/board",
         "PATCH {id:int}/comments/{commentId:int}",
         "PATCH {id:int}/media/{mediaId:int}",
+        "PATCH {id:int}/poc",
         "POST AddChecklistItem",
         "POST AddComment",
         "POST AddCommentJson",

Api.SeaHavenIndustries/Controllers/WorkOrderBoardController.cs

@@ -24,6 +24,7 @@ namespace Api.SeaHavenIndustries.Controllers
         private readonly IWorkOrderBoardUpdateService _boardUpdateService;
         private readonly IWorkOrderBoardCreateService _boardCreateService;
         private readonly IWorkOrderBoardCancelService _boardCancelService;
+        private readonly IWorkOrderPocService _pocService;
         private readonly IWorkOrderAdvancedSearchService _advancedSearchService;
 
         public WorkOrderBoardController(
@@ -31,12 +32,14 @@ namespace Api.SeaHavenIndustries.Controllers
             IWorkOrderBoardUpdateService boardUpdateService,
             IWorkOrderBoardCreateService boardCreateService,
             IWorkOrderBoardCancelService boardCancelService,
+            IWorkOrderPocService pocService,
             IWorkOrderAdvancedSearchService advancedSearchService)
         {
             _workOrderBoardService = workOrderBoardService;
             _boardUpdateService = boardUpdateService;
             _boardCreateService = boardCreateService;
             _boardCancelService = boardCancelService;
+            _pocService = pocService;
             _advancedSearchService = advancedSearchService;
         }
 
@@ -165,6 +168,56 @@ namespace Api.SeaHavenIndustries.Controllers
             }
         }
 
+        /// <summary>
+        /// SH-379: replaces the WO-level POC (name, phone, notes) with audit entries.
+        /// Blank name+phone clears the override so the work order follows the Site.
+        /// </summary>
+        [HttpPatch("{id:int}/poc")]
+        public async Task<IActionResult> UpdateWorkOrderPoc(int id, [FromBody] WorkOrderPocUpdateRequestDto request)
+        {
+            try
+            {
+                var actorId = User.FindFirstValue(ClaimTypes.NameIdentifier);
+                var row = await _pocService.UpdatePocAsync(id, request, User, actorId);
+                return Ok(row);
+            }
+            catch (WorkOrderBoardConcurrencyException ex)
+            {
+                return Conflict(new WorkOrderBoardConflictDto
+                {
+                    CurrentState = ex.CurrentState
+                });
+            }
+            catch (WorkOrderBoardValidationException ex) when (ex.Code == "Forbidden")
+            {
+                return StatusCode(StatusCodes.Status403Forbidden, new WorkOrderBoardValidationErrorDto
+                {
+                    Code = ex.Code,
+                    Message = ex.Message
+                });
+            }
+            catch (WorkOrderBoardValidationException ex) when (ex.Code == "NotFound")
+            {
+                return NotFound(new WorkOrderBoardValidationErrorDto
+                {
+                    Code = ex.Code,
+                    Message = ex.Message
+                });
+            }
+            catch (WorkOrderBoardValidationException ex)
+            {
+                return UnprocessableEntity(new WorkOrderBoardValidationErrorDto
+                {
+                    Code = ex.Code,
+                    Message = ex.Message
+                });
+            }
+            catch (ArgumentException ex)
+            {
+                return BadRequest(new Response { Status = "Error", Message = ex.Message });
+            }
+        }
+
         [HttpPost("board")]
         public async Task<IActionResult> CreateBoardWorkOrder(
             [FromBody] WorkOrderBoardCreateRequestDto request,

SeaHaven.DataServices/Helpers/WorkOrderBoardProjection.cs

@@ -52,6 +52,20 @@ namespace SeaHaven.DataServices.Helpers
                             c.Notes
                         })
                         .FirstOrDefault(),
+                    // SH-379/SH-190: the Site's live primary contact backs the
+                    // follow-the-site POC display when no override or link exists.
+                    SitePoc = w.Locations != null
+                        ? w.Locations.Contacts!
+                            .Where(c => c.IsDeleted != true)
+                            .OrderBy(c => c.SiteContactOrder)
+                            .ThenBy(c => c.Id)
+                            .Select(c => new
+                            {
+                                Name = ((c.FirstName ?? "") + " " + (c.LastName ?? "")).Trim(),
+                                c.PhoneNumber
+                            })
+                            .FirstOrDefault()
+                        : null,
                     w.LifecycleStatus,
                     w.LegacyStatus,
                     w.Status,
@@ -116,11 +130,11 @@ namespace SeaHaven.DataServices.Helpers
                     : null;
                 var primaryFrozenPoc = frozenPoc?.Contacts.FirstOrDefault();
                 var pocName = primaryFrozenPoc?.Name
-                    ?? (!string.IsNullOrWhiteSpace(w.WoPocName) ? w.WoPocName : w.ContactPoc?.Name);
+                    ?? FirstNotBlank(w.WoPocName, w.ContactPoc?.Name, w.SitePoc?.Name);
                 var pocPhone = primaryFrozenPoc?.Phone
-                    ?? (!string.IsNullOrWhiteSpace(w.WoPocPhone) ? w.WoPocPhone : w.ContactPoc?.PhoneNumber);
+                    ?? FirstNotBlank(w.WoPocPhone, w.ContactPoc?.PhoneNumber, w.SitePoc?.PhoneNumber);
                 var pocNotes = frozenPoc?.Notes
-                    ?? (!string.IsNullOrWhiteSpace(w.WoPocNotes) ? w.WoPocNotes : w.ContactPoc?.Notes);
+                    ?? FirstNotBlank(w.WoPocNotes, w.ContactPoc?.Notes);
                 var techPhone = !string.IsNullOrWhiteSpace(w.DispatchTechPhone)
                     ? w.DispatchTechPhone
                     : (!string.IsNullOrWhiteSpace(w.WoTechPhone) ? w.WoTechPhone : w.VendorPhone);
@@ -188,10 +202,15 @@ namespace SeaHaven.DataServices.Helpers
                     w.MediaCount,
                     frozenSite,
                     frozenCompany,
-                    frozenPoc);
+                    frozenPoc,
+                    w.WoPocName,
+                    w.WoPocPhone);
             }).ToList();
         }
 
+        private static string? FirstNotBlank(params string?[] values)
+            => values.FirstOrDefault(value => !string.IsNullOrWhiteSpace(value))?.Trim();
+
         private static T? Deserialize<T>(string? json)
         {
             if (string.IsNullOrWhiteSpace(json))

SeaHaven.DataServices/Implementation/WorkOrderBoardMutationDataService.cs

@@ -21,7 +21,8 @@ namespace SeaHaven.DataServices.Implementation
 
         public Task<WorkOrder?> GetTrackedWorkOrderAsync(int workOrderId, CancellationToken cancellationToken)
             => _context.workOrders
-                .Include(workOrder => workOrder.Locations)
+                .Include(workOrder => workOrder.Locations!)
+                    .ThenInclude(location => location.Contacts)
                 .Include(workOrder => workOrder.WorkOrderContacts!)
                     .ThenInclude(contact => contact.POC)
                 .Include(workOrder => workOrder.PrimaryDispatch!)

SeaHaven.DataServices/Implementation/WorkOrderPocDataService.cs

@@ -0,0 +1,47 @@
+using Data.SeaHavenIndustries;
+using Microsoft.EntityFrameworkCore;
+using SeaHaven.DataServices.Interfaces;
+
+namespace SeaHaven.DataServices.Implementation
+{
+    public class WorkOrderPocDataService : IWorkOrderPocDataService
+    {
+        private readonly ApplicationDbContext _context;
+
+        public WorkOrderPocDataService(ApplicationDbContext context)
+        {
+            _context = context;
+        }
+
+        public Task<WorkOrder?> GetTrackedWorkOrderAsync(
+            int workOrderId,
+            int? accountId,
+            CancellationToken cancellationToken)
+            => _context.workOrders
+                .Include(workOrder => workOrder.Locations!)
+                    .ThenInclude(location => location.Contacts)
+                .Include(workOrder => workOrder.WorkOrderContacts!)
+                    .ThenInclude(contact => contact.POC)
+                .FirstOrDefaultAsync(
+                    w => w.Id == workOrderId
+                        && w.istemplate != true
+                        && (w.IsDeleted != true || w.IsDeleted == null)
+                        && (accountId == null || w.AccountId == accountId),
+                    cancellationToken);
+
+        public async Task<IReadOnlyList<Contacts>> GetSiteContactsAsync(
+            int? locationId,
+            CancellationToken cancellationToken)
+        {
+            if (locationId == null)
+                return Array.Empty<Contacts>();
+
+            return await _context.Contacts
+                .AsNoTracking()
+                .Where(c => c.LocationId == locationId && c.IsDeleted != true)
+                .OrderBy(c => c.SiteContactOrder)
+                .ThenBy(c => c.Id)
+                .ToListAsync(cancellationToken);
+        }
+    }
+}

SeaHaven.DataServices/Interfaces/IWorkOrderPocDataService.cs

@@ -0,0 +1,28 @@
+using Data.SeaHavenIndustries;
+
+namespace SeaHaven.DataServices.Interfaces
+{
+    /// <summary>
+    /// SH-379: data access for the work-order-level POC override.
+    /// </summary>
+    public interface IWorkOrderPocDataService
+    {
+        /// <summary>
+        /// SH-221 account-scoped tracked load for POC updates. Includes the site's
+        /// contacts and the linked WorkOrderContacts POC. Null when the work order
+        /// does not exist or is outside the caller's account scope.
+        /// </summary>
+        Task<WorkOrder?> GetTrackedWorkOrderAsync(
+            int workOrderId,
+            int? accountId,
+            CancellationToken cancellationToken);
+
+        /// <summary>
+        /// The site's live contacts for a location ordered by SiteContactOrder then Id.
+        /// Deleted contacts are excluded. Empty when the location has none.
+        /// </summary>
+        Task<IReadOnlyList<Contacts>> GetSiteContactsAsync(
+            int? locationId,
+            CancellationToken cancellationToken);
+    }
+}

SeaHaven.DataServices/Interfaces/WorkOrderBoardModels.cs

@@ -71,7 +71,9 @@ namespace SeaHaven.DataServices.Interfaces
         int MediaCount = 0,
         WorkOrderFrozenSite? FrozenSite = null,
         WorkOrderFrozenCompany? FrozenCompany = null,
-        WorkOrderFrozenPoc? FrozenPoc = null);
+        WorkOrderFrozenPoc? FrozenPoc = null,
+        string? WoPocName = null,
+        string? WoPocPhone = null);
 
     public record WorkOrderBoardQueryResult(
         IReadOnlyList<WorkOrderBoardRawRow> ScheduledRows,

SeaHaven.Services/DTOs/WorkOrderBoardDTOs.cs

@@ -92,6 +92,8 @@ namespace SeaHaven.Services.DTOs
         public string? PocName { get; set; }
         public string? PocPhone { get; set; }
         public string? PocNotes { get; set; }
+        /// <summary>SH-190: a manual WO-level POC override is present (locked away from the Site).</summary>
+        public bool PocCustomized { get; set; }
         public List<WorkOrderAdditionalContactDto>? AdditionalContacts { get; set; }
         public WorkOrderFrozenSiteDto? FrozenSite { get; set; }
         public WorkOrderFrozenCompanyDto? FrozenCompany { get; set; }

SeaHaven.Services/DTOs/WorkOrderBoardRequestDTOs.cs

@@ -58,6 +58,20 @@ namespace SeaHaven.Services.DTOs
         public int? Severity { get; set; }
     }
 
+    /// <summary>
+    /// SH-379: replaces the work-order-level POC override (PocName/PocPhone/PocNotes).
+    /// Blank name and phone clear the override so the work order follows the Site's
+    /// live contact again. An edit equal to a live Site contact does not lock (SH-190).
+    /// </summary>
+    public class WorkOrderPocUpdateRequestDto
+    {
+        public string? PocName { get; set; }
+        public string? PocPhone { get; set; }
+        public string? PocNotes { get; set; }
+        /// <summary>Base64 row version, same concurrency token as the board patch.</summary>
+        public string? WorkOrderVersion { get; set; }
+    }
+
     /// <summary>Advanced search / filter query for the board.</summary>
     public class WorkOrderAdvancedSearchQueryDto
     {

SeaHaven.Services/Helpers/WorkOrderCompletionSnapshotMapper.cs

@@ -17,10 +17,14 @@ namespace SeaHaven.Services.Helpers
             var contact = workOrder.WorkOrderContacts?
                 .OrderBy(item => item.Id)
                 .FirstOrDefault();
+            // SH-379/SH-190: a work order without an override or link freezes the
+            // Site's live primary contact, matching the board display precedence.
+            var sitePrimary = WorkOrderPocSiteContact.ResolvePrimary(location?.Contacts);
             var pocName = FirstNotBlank(
                 workOrder.PocName,
-                JoinName(contact?.POC?.FirstName, contact?.POC?.MiddleName, contact?.POC?.LastName));
-            var pocPhone = FirstNotBlank(workOrder.PocPhone, contact?.POC?.PhoneNumber);
+                JoinName(contact?.POC?.FirstName, contact?.POC?.MiddleName, contact?.POC?.LastName),
+                WorkOrderPocSiteContact.DisplayName(sitePrimary));
+            var pocPhone = FirstNotBlank(workOrder.PocPhone, contact?.POC?.PhoneNumber, sitePrimary?.PhoneNumber);
             var pocNotes = FirstNotBlank(workOrder.PocNotes, contact?.Notes);
 
             var contacts = new List<WorkOrderFrozenPocContact>();

SeaHaven.Services/Helpers/WorkOrderPocSiteContact.cs

@@ -0,0 +1,54 @@
+using Data.SeaHavenIndustries;
+
+namespace SeaHaven.Services.Helpers
+{
+    /// <summary>
+    /// SH-379 / SH-190: single resolution for "the Site's live contact" used by the
+    /// manual POC override. The same rules back the board projection fallback, the
+    /// completion snapshot fallback, the create-time baseline, and the
+    /// "changing away from the Site's live contact" lock comparison.
+    /// </summary>
+    public static class WorkOrderPocSiteContact
+    {
+        /// <summary>
+        /// The Site's primary live contact: first non-deleted contact ordered by
+        /// SiteContactOrder then Id. Null when the site has no live contacts.
+        /// </summary>
+        public static Contacts? ResolvePrimary(IEnumerable<Contacts>? contacts)
+            => contacts?
+                .Where(c => c.IsDeleted != true)
+                .OrderBy(c => c.SiteContactOrder)
+                .ThenBy(c => c.Id)
+                .FirstOrDefault();
+
+        /// <summary>Display name matching the board projection: trimmed First + Last.</summary>
+        public static string? DisplayName(Contacts? contact)
+            => contact == null
+                ? null
+                : Normalize(((contact.FirstName ?? "") + " " + (contact.LastName ?? "")).Trim());
+
+        /// <summary>
+        /// SH-190: a manual POC equal to one of the Site's live contacts (trimmed
+        /// name + phone) is not a change away from the Site and must not lock.
+        /// </summary>
+        public static bool MatchesAnySiteContact(
+            string? name,
+            string? phone,
+            IEnumerable<Contacts>? contacts)
+        {
+            if (contacts == null)
+                return false;
+
+            var normalizedName = Normalize(name);
+            var normalizedPhone = Normalize(phone);
+
+            return contacts
+                .Where(c => c.IsDeleted != true)
+                .Any(c => string.Equals(Normalize(((c.FirstName ?? "") + " " + (c.LastName ?? "")).Trim()), normalizedName, StringComparison.Ordinal)
+                    && string.Equals(Normalize(c.PhoneNumber), normalizedPhone, StringComparison.Ordinal));
+        }
+
+        private static string? Normalize(string? value)
+            => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+    }
+}

SeaHaven.Services/Implementation/WorkOrderBoardCreateService.cs

@@ -20,6 +20,7 @@ namespace SeaHaven.Services.Implementation
         private readonly IWorkOrderAuditService _auditService;
         private readonly IWorkOrderBoardCreateValidation _validator;
         private readonly IWorkOrderAccountResolver _accountResolver;
+        private readonly IWorkOrderPocDataService _pocData;
         private readonly IServicesRegistryService? _servicesRegistryService;
 
         public WorkOrderBoardCreateService(
@@ -29,6 +30,7 @@ namespace SeaHaven.Services.Implementation
             IWorkOrderAuditService auditService,
             IWorkOrderBoardCreateValidation validator,
             IWorkOrderAccountResolver accountResolver,
+            IWorkOrderPocDataService pocData,
             IServicesRegistryService? servicesRegistryService = null)
         {
             _boardDataService = boardDataService;
@@ -37,6 +39,7 @@ namespace SeaHaven.Services.Implementation
             _auditService = auditService;
             _validator = validator;
             _accountResolver = accountResolver;
+            _pocData = pocData;
             _servicesRegistryService = servicesRegistryService;
         }
 
@@ -64,6 +67,15 @@ namespace SeaHaven.Services.Implementation
             var pocName = TrimOrNull(request.PocName);
             var pocPhone = TrimOrNull(request.PocPhone);
             var pocNotes = TrimOrNull(request.PocNotes);
+            // SH-190 AC3: a create-time POC equal to one of the Site's live contacts
+            // is not an override. Store nothing so the work order keeps following
+            // the Site's live contact until a dispatcher edits away from it.
+            var siteContacts = await _pocData.GetSiteContactsAsync(request.LocationId, cancellationToken);
+            if (WorkOrderPocSiteContact.MatchesAnySiteContact(pocName, pocPhone, siteContacts))
+            {
+                pocName = null;
+                pocPhone = null;
+            }
             var additionalContactsJson = WorkOrderAdditionalContactsMapper.SerializeForStorage(request.AdditionalContacts);
             var techPhone = TrimOrNull(request.TechPhone);
             var vendorNotes = TrimOrNull(request.VendorNotes);

SeaHaven.Services/Implementation/WorkOrderBoardService.cs

@@ -116,6 +116,7 @@ namespace SeaHaven.Services.Implementation
                 PocName = row.PocName,
                 PocPhone = row.PocPhone,
                 PocNotes = row.PocNotes,
+                PocCustomized = !string.IsNullOrWhiteSpace(row.WoPocName) || !string.IsNullOrWhiteSpace(row.WoPocPhone),
                 FrozenSite = MapFrozenSite(row.FrozenSite),
                 FrozenCompany = MapFrozenCompany(row.FrozenCompany),
                 FrozenPoc = MapFrozenPoc(row.FrozenPoc),

SeaHaven.Services/Implementation/WorkOrderPocService.cs

@@ -0,0 +1,169 @@
+using System.Security.Claims;
+using Data.SeaHavenIndustries;
+using SeaHaven.DataServices.Interfaces;
+using SeaHaven.Services.DTOs;
+using SeaHaven.Services.Exceptions;
+using SeaHaven.Services.Helpers;
+using SeaHaven.Services.Interfaces;
+
+namespace SeaHaven.Services.Implementation
+{
+    /// <summary>
+    /// SH-379: persists a manual POC override on an existing work order. The manual
+    /// value is stored in the WO-level PocName/PocPhone/PocNotes fields, staged as
+    /// FieldChanged audit entries (which also write field locks so later syncs never
+    /// overwrite a manual POC, SH-190 AC2), and captured by the completion freeze.
+    /// An edit equal to one of the Site's live contacts stores no override, so a
+    /// never-overridden work order keeps following the Site (SH-190 AC3).
+    /// </summary>
+    public class WorkOrderPocService : IWorkOrderPocService
+    {
+        private readonly IWorkOrderPocDataService _pocData;
+        private readonly IWorkOrderBoardMutationDataService _mutationData;
+        private readonly IWorkOrderBoardService _boardService;
+        private readonly IWorkOrderAuditService _auditService;
+        private readonly IWorkOrderAccountResolver _accountResolver;
+
+        public WorkOrderPocService(
+            IWorkOrderPocDataService pocData,
+            IWorkOrderBoardMutationDataService mutationData,
+            IWorkOrderBoardService boardService,
+            IWorkOrderAuditService auditService,
+            IWorkOrderAccountResolver accountResolver)
+        {
+            _pocData = pocData;
+            _mutationData = mutationData;
+            _boardService = boardService;
+            _auditService = auditService;
+            _accountResolver = accountResolver;
+        }
+
+        public async Task<WorkOrderBoardRowDto> UpdatePocAsync(
+            int workOrderId,
+            WorkOrderPocUpdateRequestDto request,
+            ClaimsPrincipal user,
+            string? actorId)
+        {
+            var accountId = _accountResolver.ResolveAccountFilter(user);
+
+            var workOrderVersion = ParseRowVersion(request.WorkOrderVersion);
+            if (workOrderVersion == null)
+                throw new WorkOrderBoardValidationException("WorkOrderVersionRequired", "workOrderVersion is required.");
+
+            ValidateLengths(request);
+
+            await _mutationData.ExecuteTransactionalAsync(async ct =>
+            {
+                var workOrder = await _pocData.GetTrackedWorkOrderAsync(workOrderId, accountId, ct);
+                if (workOrder == null)
+                    throw new WorkOrderBoardValidationException("NotFound", "Work order not found.");
+
+                if (!RowVersionsMatch(workOrder.RowVersion, workOrderVersion))
+                    throw new WorkOrderBoardConcurrencyException(await LoadBoardRowAsync(workOrderId, user));
+
+                if (WorkOrderBoardMutationRules.IsFullyLocked(workOrder.LifecycleStatus))
+                    throw new WorkOrderBoardValidationException("CanceledReadOnly", "Work order is read-only in its current status.");
+                if (WorkOrderBoardMutationRules.IsCoreLocked(workOrder.LifecycleStatus))
+                    throw new WorkOrderBoardValidationException("ReadOnly", "Work order is read-only in its current status.");
+
+                var sitePrimary = WorkOrderPocSiteContact.ResolvePrimary(workOrder.Locations?.Contacts);
+                var linkedContact = workOrder.WorkOrderContacts?
+                    .OrderBy(item => item.Id)
+                    .FirstOrDefault()?.POC;
+
+                var newName = TrimOrNull(request.PocName);
+                var newPhone = TrimOrNull(request.PocPhone);
+                var newNotes = TrimOrNull(request.PocNotes);
+
+                // SH-190: changing away from the Site's live contact locks the POC.
+                // An edit that equals one of the Site's live contacts (and blanking
+                // both fields) stores no override, so the work order follows the Site.
+                var overrideName = newName;
+                var overridePhone = newPhone;
+                if ((overrideName != null || overridePhone != null)
+                    && WorkOrderPocSiteContact.MatchesAnySiteContact(overrideName, overridePhone, workOrder.Locations?.Contacts))
+                {
+                    overrideName = null;
+                    overridePhone = null;
+                }
+
+                var oldEffectiveName = FirstNotBlank(workOrder.PocName, ContactDisplayName(linkedContact), WorkOrderPocSiteContact.DisplayName(sitePrimary));
+                var oldEffectivePhone = FirstNotBlank(workOrder.PocPhone, linkedContact?.PhoneNumber, sitePrimary?.PhoneNumber);
+                var newEffectiveName = FirstNotBlank(overrideName, ContactDisplayName(linkedContact), WorkOrderPocSiteContact.DisplayName(sitePrimary));
+                var newEffectivePhone = FirstNotBlank(overridePhone, linkedContact?.PhoneNumber, sitePrimary?.PhoneNumber);
+
+                var storedChanged = !string.Equals(workOrder.PocName, overrideName, StringComparison.Ordinal)
+                    || !string.Equals(workOrder.PocPhone, overridePhone, StringComparison.Ordinal)
+                    || !string.Equals(workOrder.PocNotes, newNotes, StringComparison.Ordinal);
+
+                var oldNotes = workOrder.PocNotes;
+                workOrder.PocName = overrideName;
+                workOrder.PocPhone = overridePhone;
+                workOrder.PocNotes = newNotes;
+
+                if (!storedChanged)
+                    return;
+
+                _mutationData.SetExpectedWorkOrderVersion(workOrder, workOrderVersion);
+
+                // Audit effective old -> new values with the same field names create
+                // uses, so the trail reads consistently across create and update.
+                if (!string.Equals(oldEffectiveName, newEffectiveName, StringComparison.Ordinal))
+                    await _auditService.StageFieldChangedAsync(workOrderId, "PocName", oldEffectiveName, newEffectiveName, actorId);
+                if (!string.Equals(oldEffectivePhone, newEffectivePhone, StringComparison.Ordinal))
+                    await _auditService.StageFieldChangedAsync(workOrderId, "PocPhone", oldEffectivePhone, newEffectivePhone, actorId);
+                if (!string.Equals(TrimOrNull(oldNotes), newNotes, StringComparison.Ordinal))
+                    await _auditService.StageFieldChangedAsync(workOrderId, "PocNotes", TrimOrNull(oldNotes), newNotes, actorId);
+
+                var outcome = await _mutationData.SaveAsync(ct);
+                if (outcome == BoardSaveOutcome.ConcurrencyConflict)
+                    throw new WorkOrderBoardConcurrencyException(await LoadBoardRowAsync(workOrderId, user));
+            }, CancellationToken.None);
+
+            var row = await LoadBoardRowAsync(workOrderId, user);
+            return row ?? throw new WorkOrderBoardValidationException("NotFound", "Work order not found.");
+        }
+
+        private async Task<WorkOrderBoardRowDto?> LoadBoardRowAsync(int workOrderId, ClaimsPrincipal user)
+            => await _boardService.GetBoardRowAsync(workOrderId, user);
+
+        private static void ValidateLengths(WorkOrderPocUpdateRequestDto request)
+        {
+            if (request.PocName?.Length > 200)
+                throw new WorkOrderBoardValidationException("InvalidValue", "pocName must be at most 200 characters.");
+            if (request.PocPhone?.Length > 50)
+                throw new WorkOrderBoardValidationException("InvalidValue", "pocPhone must be at most 50 characters.");
+            if (request.PocNotes?.Length > 2000)
+                throw new WorkOrderBoardValidationException("InvalidValue", "pocNotes must be at most 2000 characters.");
+        }
+
+        private static string? ContactDisplayName(Contacts? contact)
+            => contact == null
+                ? null
+                : TrimOrNull(((contact.FirstName ?? "") + " " + (contact.LastName ?? "")).Trim());
+
+        private static string? FirstNotBlank(params string?[] values)
+            => values.FirstOrDefault(value => !string.IsNullOrWhiteSpace(value))?.Trim();
+
+        private static string? TrimOrNull(string? value)
+            => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+
+        private static byte[]? ParseRowVersion(string? base64)
+        {
+            if (string.IsNullOrWhiteSpace(base64))
+                return null;
+
+            try
+            {
+                return Convert.FromBase64String(base64);
+            }
+            catch (FormatException)
+            {
+                throw new WorkOrderBoardValidationException("InvalidRowVersion", "Invalid workOrderVersion format.");
+            }
+        }
+
+        private static bool RowVersionsMatch(byte[]? current, byte[] expected)
+            => current != null && current.AsSpan().SequenceEqual(expected);
+    }
+}

SeaHaven.Services/Interfaces/IWorkOrderPocService.cs

@@ -0,0 +1,18 @@
+using System.Security.Claims;
+using SeaHaven.Services.DTOs;
+
+namespace SeaHaven.Services.Interfaces
+{
+    /// <summary>
+    /// SH-379: persists a manual POC override on an existing work order with audit
+    /// entries, and applies the SH-190 follow-site / lock semantics.
+    /// </summary>
+    public interface IWorkOrderPocService
+    {
+        Task<WorkOrderBoardRowDto> UpdatePocAsync(
+            int workOrderId,
+            WorkOrderPocUpdateRequestDto request,
+            ClaimsPrincipal user,
+            string? actorId);
+    }
+}

SeaHavenIndustries.Tests/WorkOrderAccountScopeTests.cs

@@ -33,7 +33,7 @@ public class WorkOrderAccountScopeTests
         var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
         var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
         return new WorkOrderBoardCreateService(
-            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver);
+            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver, new WorkOrderPocDataService(context));
     }
 
     [Fact]
@@ -232,7 +232,7 @@ public class WorkOrderAccountScopeTests
         var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
         var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
         var create = new WorkOrderBoardCreateService(
-            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver);
+            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver, new WorkOrderPocDataService(context));
 
         using var cts = new CancellationTokenSource();
         await create.CreateAsync(

SeaHavenIndustries.Tests/WorkOrderBoardCreateRelationalTests.cs

@@ -49,7 +49,8 @@ public class WorkOrderBoardCreateRelationalTests
             boardService,
             audit,
             new WorkOrderBoardCreateValidation(),
-            resolver);
+            resolver,
+            new WorkOrderPocDataService(context));
 
         var result = await service.CreateAsync(new WorkOrderBoardCreateRequestDto
         {
@@ -111,7 +112,8 @@ public class WorkOrderBoardCreateRelationalTests
             boardService,
             audit,
             new WorkOrderBoardCreateValidation(),
-            resolver);
+            resolver,
+            new WorkOrderPocDataService(context));
 
         await Assert.ThrowsAsync<DbUpdateException>(() =>
             service.CreateAsync(new WorkOrderBoardCreateRequestDto

SeaHavenIndustries.Tests/WorkOrderBoardCreateServiceTests.cs

@@ -27,7 +27,7 @@ public class WorkOrderBoardCreateServiceTests
         var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
         var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
         var validator = new WorkOrderBoardCreateValidation();
-        var service = new WorkOrderBoardCreateService(boardData, mutationData, boardService, audit, validator, resolver);
+        var service = new WorkOrderBoardCreateService(boardData, mutationData, boardService, audit, validator, resolver, new WorkOrderPocDataService(context));
         return (context, service);
     }
 

SeaHavenIndustries.Tests/WorkOrderBoardCreateSyncLockTests.cs

@@ -32,7 +32,8 @@ public class WorkOrderBoardCreateSyncLockTests
             boardService,
             audit,
             new WorkOrderBoardCreateValidation(),
-            resolver);
+            resolver,
+            new WorkOrderPocDataService(context));
         var policy = new SyncFieldMergePolicy(fieldLocks);
 
         await createService.CreateAsync(new WorkOrderBoardCreateRequestDto
@@ -81,7 +82,8 @@ public class WorkOrderBoardCreateSyncLockTests
             boardService,
             audit,
             new WorkOrderBoardCreateValidation(),
-            resolver);
+            resolver,
+            new WorkOrderPocDataService(context));
         var policy = new SyncFieldMergePolicy(fieldLocks);
 
         await createService.CreateAsync(new WorkOrderBoardCreateRequestDto

SeaHavenIndustries.Tests/WorkOrderPhase7CoexistenceTests.cs

@@ -74,7 +74,7 @@ public class WorkOrderPhase7CoexistenceTests
         var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
         var audit = new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks);
         var createService = new WorkOrderBoardCreateService(
-            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver);
+            boardData, mutationData, boardService, audit, new WorkOrderBoardCreateValidation(), resolver, new WorkOrderPocDataService(context));
         var policy = new SyncFieldMergePolicy(fieldLocks);
         var ingest = new WorkOrderIngestService(new WorkOrderIngestDataService(context), policy, fieldLocks, audit, WorkOrderAccountTestHelpers.Resolver(context));
 

SeaHavenIndustries.Tests/WorkOrderPocServiceTests.cs

@@ -0,0 +1,518 @@
+using Data.SeaHavenIndustries;
+using Data.SeaHavenIndustries.Enums;
+using Microsoft.EntityFrameworkCore;
+using SeaHaven.DataServices.Implementation;
+using SeaHaven.Services.DTOs;
+using SeaHaven.Services.Exceptions;
+using SeaHaven.Services.Helpers;
+using SeaHaven.Services.Implementation;
+using SeaHaven.Services.Interfaces;
+using SeaHaven.Services.Validation;
+
+namespace SeaHavenIndustries.Tests;
+
+public class WorkOrderPocServiceTests
+{
+    [Fact]
+    public async Task ManualOverridePersistsIsAuditedAndLocks()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var row = await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Manual POC", "312-555-0001", "Call first", workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Equal("Manual POC", persisted.PocName);
+        Assert.Equal("312-555-0001", persisted.PocPhone);
+        Assert.Equal("Call first", persisted.PocNotes);
+        Assert.Equal("Manual POC", row.PocName);
+        Assert.Equal("312-555-0001", row.PocPhone);
+        Assert.True(row.PocCustomized);
+
+        var auditName = await context.WorkOrderAuditLogs.SingleAsync(a =>
+            a.WorkOrderId == workOrder.Id && a.FieldName == "PocName");
+        Assert.Equal("Alice Site", auditName.OldValue);
+        Assert.Equal("Manual POC", auditName.NewValue);
+        Assert.Equal("FieldChanged", auditName.Action);
+        Assert.True(await context.WorkOrderFieldLocks.AnyAsync(l =>
+            l.WorkOrderId == workOrder.Id && l.FieldName == "PocName"));
+        Assert.True(await context.WorkOrderFieldLocks.AnyAsync(l =>
+            l.WorkOrderId == workOrder.Id && l.FieldName == "PocPhone"));
+    }
+
+    [Fact]
+    public async Task ManualOverrideSurvivesCompleteAndLaterSiteChanges()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        workOrder.LifecycleStatus = LifecycleStatus.Scheduled;
+        workOrder.ScheduledDate = DateTime.UtcNow.Date.AddDays(1);
+        await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Manual POC", "312-555-0001", null, workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        var updateService = CreateUpdateService(context);
+        var completed = await updateService.PatchFieldAsync(
+            workOrder.Id,
+            Patch(WorkOrderBoardFieldNames.LifecycleStatus, "Complete", workOrder),
+            "actor-1");
+        Assert.Equal("Manual POC", completed.PocName);
+
+        var siteContact = await context.Contacts.SingleAsync(c => c.FirstName == "Alice");
+        siteContact.FirstName = "Changed";
+        siteContact.PhoneNumber = "999-555-0100";
+        await context.SaveChangesAsync();
+
+        var row = await CreateBoardService(context).GetBoardRowAsync(
+            workOrder.Id, WorkOrderAccountTestHelpers.AccountUser());
+        Assert.Equal("Manual POC", row!.PocName);
+        Assert.Equal("312-555-0001", row.PocPhone);
+    }
+
+    [Fact]
+    public async Task SiteContactUpdateDoesNotOverwriteManualOverride()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        var siteContact = await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Manual POC", "312-555-0001", null, workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        siteContact.FirstName = "Rotated";
+        siteContact.PhoneNumber = "999-555-0100";
+        await context.SaveChangesAsync();
+
+        var row = await CreateBoardService(context).GetBoardRowAsync(
+            workOrder.Id, WorkOrderAccountTestHelpers.AccountUser());
+        Assert.Equal("Manual POC", row!.PocName);
+        Assert.Equal("312-555-0001", row.PocPhone);
+        Assert.True(row.PocCustomized);
+    }
+
+    [Fact]
+    public async Task UnlockedWorkOrderFollowsSiteContact()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        var primary = await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100", order: 0);
+        await SeedSiteContactAsync(context, firstName: "Bob", lastName: "Backup", phone: "312-555-0200", order: 1);
+        await context.SaveChangesAsync();
+
+        var boardService = CreateBoardService(context);
+        var before = await boardService.GetBoardRowAsync(workOrder.Id, WorkOrderAccountTestHelpers.AccountUser());
+        Assert.Equal("Alice Site", before!.PocName);
+        Assert.Equal("312-555-0100", before.PocPhone);
+        Assert.False(before.PocCustomized);
+
+        primary.PhoneNumber = "312-555-0999";
+        await context.SaveChangesAsync();
+
+        var after = await boardService.GetBoardRowAsync(workOrder.Id, WorkOrderAccountTestHelpers.AccountUser());
+        Assert.Equal("Alice Site", after!.PocName);
+        Assert.Equal("312-555-0999", after.PocPhone);
+        Assert.False(after.PocCustomized);
+    }
+
+    [Fact]
+    public async Task EditEqualToSiteContactDoesNotLock()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Manual POC", "312-555-0001", null, workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        var row = await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Alice Site", "312-555-0100", null, workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Null(persisted.PocName);
+        Assert.Null(persisted.PocPhone);
+        Assert.Equal("Alice Site", row.PocName);
+        Assert.Equal("312-555-0100", row.PocPhone);
+        Assert.False(row.PocCustomized);
+
+        var auditName = await context.WorkOrderAuditLogs.Where(a =>
+            a.WorkOrderId == workOrder.Id && a.FieldName == "PocName")
+            .OrderByDescending(a => a.Id)
+            .FirstAsync();
+        Assert.Equal("Manual POC", auditName.OldValue);
+        Assert.Equal("Alice Site", auditName.NewValue);
+    }
+
+    [Fact]
+    public async Task ClearingBothFieldsFollowsSiteAgain()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc("Manual POC", "312-555-0001", "keep notes", workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+        var row = await service.UpdatePocAsync(
+            workOrder.Id,
+            Poc(null, null, null, workOrder),
+            WorkOrderAccountTestHelpers.AccountUser(),
+            "actor-1");
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Null(persisted.PocName);
+        Assert.Null(persisted.PocPhone);
+        Assert.Equal("Alice Site", row.PocName);
+        Assert.False(row.PocCustomized);
+    }
+
+    [Fact]
+    public async Task CrossTenantUpdateIsRejected()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context, accountId: 2);
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() =>
+            service.UpdatePocAsync(
+                workOrder.Id,
+                Poc("Manual POC", "312-555-0001", null, workOrder),
+                WorkOrderAccountTestHelpers.AccountUser(accountId: 1),
+                "actor-1"));
+
+        Assert.Equal("NotFound", ex.Code);
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Null(persisted.PocName);
+        Assert.Empty(await context.WorkOrderAuditLogs.ToListAsync());
+    }
+
+    [Fact]
+    public async Task MissingAccountScopeIsForbidden()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() =>
+            service.UpdatePocAsync(
+                workOrder.Id,
+                Poc("Manual POC", "312-555-0001", null, workOrder),
+                WorkOrderAccountTestHelpers.MissingScope(),
+                "actor-1"));
+
+        Assert.Equal("Forbidden", ex.Code);
+    }
+
+    [Fact]
+    public async Task CompletedWorkOrderIsReadOnly()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        workOrder.LifecycleStatus = LifecycleStatus.Completed;
+        workOrder.CompletedDate = DateTime.UtcNow;
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() =>
+            service.UpdatePocAsync(
+                workOrder.Id,
+                Poc("Manual POC", "312-555-0001", null, workOrder),
+                WorkOrderAccountTestHelpers.AccountUser(),
+                "actor-1"));
+
+        Assert.Equal("ReadOnly", ex.Code);
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Null(persisted.PocName);
+    }
+
+    [Fact]
+    public async Task CanceledWorkOrderIsReadOnly()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        workOrder.LifecycleStatus = LifecycleStatus.Canceled;
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var ex = await Assert.ThrowsAsync<WorkOrderBoardValidationException>(() =>
+            service.UpdatePocAsync(
+                workOrder.Id,
+                Poc("Manual POC", "312-555-0001", null, workOrder),
+                WorkOrderAccountTestHelpers.AccountUser(),
+                "actor-1"));
+
+        Assert.Equal("CanceledReadOnly", ex.Code);
+    }
+
+    [Fact]
+    public async Task StaleVersionThrowsConflict()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        await context.SaveChangesAsync();
+
+        var service = CreatePocService(context);
+        var stale = new WorkOrderPocUpdateRequestDto
+        {
+            PocName = "Manual POC",
+            PocPhone = "312-555-0001",
+            WorkOrderVersion = Convert.ToBase64String(new byte[] { 9, 9, 9, 9 })
+        };
+
+        await Assert.ThrowsAsync<WorkOrderBoardConcurrencyException>(() =>
+            service.UpdatePocAsync(workOrder.Id, stale, WorkOrderAccountTestHelpers.AccountUser(), "actor-1"));
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == workOrder.Id);
+        Assert.Null(persisted.PocName);
+    }
+
+    [Fact]
+    public async Task CompletionFreezesSiteContactWhenNoOverrideOrLink()
+    {
+        await using var context = CreateContext();
+        await SeedScopeAsync(context);
+        var workOrder = NewWorkOrder(context);
+        workOrder.LifecycleStatus = LifecycleStatus.Scheduled;
+        workOrder.ScheduledDate = DateTime.UtcNow.Date.AddDays(1);
+        await SeedSiteContactAsync(context, firstName: "Alice", lastName: "Site", phone: "312-555-0100");
+        await context.SaveChangesAsync();
+
+        var updateService = CreateUpdateService(context);
+        var completed = await updateService.PatchFieldAsync(
+            workOrder.Id,
+            Patch(WorkOrderBoardFieldNames.LifecycleStatus, "Complete", workOrder),
+            "actor-1");
+
+        Assert.Equal(LifecycleStatus.Completed, completed.LifecycleStatus);
+        Assert.Equal("Alice Site", completed.PocName);
+        Assert.Equal("312-555-0100", completed.PocPhone);
+
+        var contact = await context.Contacts.SingleAsync();
+        contact.PhoneNumber = "999-555-0100";
+        await context.SaveChangesAsync();
+
+        var row = await CreateBoardService(context).GetBoardRowAsync(
+            workOrder.Id, WorkOrderAccountTestHelpers.AccountUser());
+        Assert.Equal("Alice Site", row!.PocName);
+        Assert.Equal("312-555-0100", row.PocPhone);
+    }
+
+    [Fact]
+    public async Task BoardCreateWithPocEqualToSiteContactFollowsSite()
+    {
+        await using var context = CreateContext();
+        WorkOrderAccountTestHelpers.SeedBoardCreateScope(context);
+        context.Contacts.Add(new Contacts
+        {
+            FirstName = "Alice",
+            LastName = "Site",
+            PhoneNumber = "312-555-0100",
+            LocationId = 1,
+            SiteContactOrder = 0
+        });
+        await context.SaveChangesAsync();
+
+        var service = CreateCreateService(context);
+        var row = await service.CreateAsync(new WorkOrderBoardCreateRequestDto
+        {
+            WorkOrderType = WorkOrderType.PM,
+            SiteCode = "BK5",
+            LocationId = 1,
+            PocName = "Alice Site",
+            PocPhone = "312-555-0100"
+        }, WorkOrderAccountTestHelpers.AccountUser(), "actor-1");
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == row.Id);
+        Assert.Null(persisted.PocName);
+        Assert.Null(persisted.PocPhone);
+        Assert.Equal("Alice Site", row.PocName);
+        Assert.False(row.PocCustomized);
+    }
+
+    [Fact]
+    public async Task BoardCreateWithPocAwayFromSiteContactIsStored()
+    {
+        await using var context = CreateContext();
+        WorkOrderAccountTestHelpers.SeedBoardCreateScope(context);
+        context.Contacts.Add(new Contacts
+        {
+            FirstName = "Alice",
+            LastName = "Site",
+            PhoneNumber = "312-555-0100",
+            LocationId = 1,
+            SiteContactOrder = 0
+        });
+        await context.SaveChangesAsync();
+
+        var service = CreateCreateService(context);
+        var row = await service.CreateAsync(new WorkOrderBoardCreateRequestDto
+        {
+            WorkOrderType = WorkOrderType.PM,
+            SiteCode = "BK5",
+            LocationId = 1,
+            PocName = "Manual POC",
+            PocPhone = "312-555-0001"
+        }, WorkOrderAccountTestHelpers.AccountUser(), "actor-1");
+
+        var persisted = await context.workOrders.AsNoTracking().SingleAsync(w => w.Id == row.Id);
+        Assert.Equal("Manual POC", persisted.PocName);
+        Assert.Equal("312-555-0001", persisted.PocPhone);
+        Assert.True(row.PocCustomized);
+    }
+
+    private static ApplicationDbContext CreateContext()
+    {
+        var options = new DbContextOptionsBuilder<ApplicationDbContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+        return new ApplicationDbContext(options);
+    }
+
+    private static async Task SeedScopeAsync(ApplicationDbContext context)
+    {
+        WorkOrderAccountTestHelpers.SeedBoardCreateScope(context);
+        await context.SaveChangesAsync();
+    }
+
+    private static WorkOrder NewWorkOrder(ApplicationDbContext context, int accountId = 1)
+    {
+        var location = context.Locations.Local.Single(l => l.Id == 1);
+        var workOrder = new WorkOrder
+        {
+            Id = 1,
+            InternalWONumber = "00000012345",
+            SiteCode = "BK5",
+            LocationId = location.Id,
+            Locations = location,
+            AccountId = accountId,
+            LifecycleStatus = LifecycleStatus.Incomplete,
+            RowVersion = Version()
+        };
+        context.workOrders.Add(workOrder);
+        return workOrder;
+    }
+
+    private static async Task<Contacts> SeedSiteContactAsync(
+        ApplicationDbContext context,
+        string firstName,
+        string lastName,
+        string phone,
+        int order = 0)
+    {
+        var contact = new Contacts
+        {
+            FirstName = firstName,
+            LastName = lastName,
+            PhoneNumber = phone,
+            LocationId = 1,
+            SiteContactOrder = order
+        };
+        context.Contacts.Add(contact);
+        await context.SaveChangesAsync();
+        return contact;
+    }
+
+    private static WorkOrderPocService CreatePocService(ApplicationDbContext context)
+        => new(
+            new WorkOrderPocDataService(context),
+            new WorkOrderBoardMutationDataService(context),
+            CreateBoardService(context),
+            new WorkOrderAuditService(
+                new WorkOrderAuditDataService(context),
+                new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context))),
+            WorkOrderAccountTestHelpers.Resolver(context));
+
+    private static WorkOrderBoardService CreateBoardService(ApplicationDbContext context)
+        => new(
+            new WorkOrderBoardDataService(context),
+            WorkOrderAccountTestHelpers.Resolver(context));
+
+    private static WorkOrderBoardUpdateService CreateUpdateService(ApplicationDbContext context)
+    {
+        var fieldLocks = new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context));
+        return new WorkOrderBoardUpdateService(
+            new WorkOrderBoardDataService(context),
+            new WorkOrderBoardMutationDataService(context),
+            new WorkOrderAuditService(new WorkOrderAuditDataService(context), fieldLocks));
+    }
+
+    private static WorkOrderBoardCreateService CreateCreateService(ApplicationDbContext context)
+        => new(
+            new WorkOrderBoardDataService(context),
+            new WorkOrderBoardMutationDataService(context),
+            CreateBoardService(context),
+            new WorkOrderAuditService(
+                new WorkOrderAuditDataService(context),
+                new WorkOrderFieldLockService(new WorkOrderFieldLockDataService(context))),
+            new WorkOrderBoardCreateValidation(),
+            WorkOrderAccountTestHelpers.Resolver(context),
+            new WorkOrderPocDataService(context));
+
+    private static WorkOrderPocUpdateRequestDto Poc(
+        string? name,
+        string? phone,
+        string? notes,
+        WorkOrder workOrder)
+        => new()
+        {
+            PocName = name,
+            PocPhone = phone,
+            PocNotes = notes,
+            WorkOrderVersion = Convert.ToBase64String(workOrder.RowVersion ?? Version())
+        };
+
+    private static WorkOrderBoardPatchRequestDto Patch(
+        string field,
+        string value,
+        WorkOrder workOrder)
+        => new()
+        {
+            Field = field,
+            Value = value,
+            WorkOrderVersion = Convert.ToBase64String(workOrder.RowVersion ?? Version())
+        };
+
+    private static byte[] Version() => new byte[] { 1, 0, 0, 0, 0, 0, 0, 1 };
+}