diff --git a/Api.SeaHavenIndustries/Controllers/SyncController.cs b/Api.SeaHavenIndustries/Controllers/SyncController.cs
index 5d7f778..d246273 100644
--- a/Api.SeaHavenIndustries/Controllers/SyncController.cs
+++ b/Api.SeaHavenIndustries/Controllers/SyncController.cs
@@ -1,32 +1,49 @@
 using Amazon.DynamoDBv2;
 using Amazon.DynamoDBv2.Model;
+using Api.SeaHavenIndustries.Options;
 using Data.SeaHavenIndustries;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
 
 namespace Api.SeaHavenIndustries.Controllers
 {
-    [Authorize]
+    [Authorize(Roles = "Admin")]
     [ApiController]
     [Route("api/[controller]")]
     public class SyncController : Controller
     {
         private readonly ApplicationDbContext _db;
         private readonly AmazonDynamoDBClient _dynamo;
+        private readonly SyncOptions _syncOptions;
         private const string WO_TABLE = "WorkOrders";
         private const string COMMENTS_TABLE = "WorkOrderComments";
         private const string VENDOR_REPLIES_TABLE = "VendorReplies";
 
-        public SyncController(ApplicationDbContext db)
+        public SyncController(ApplicationDbContext db, IOptions<SyncOptions> syncOptions)
         {
             _db = db;
+            _syncOptions = syncOptions.Value;
             _dynamo = new AmazonDynamoDBClient(Amazon.RegionEndpoint.USEast1);
         }
 
+        private IActionResult? SyncDisabledResult()
+        {
+            if (_syncOptions.Enabled)
+                return null;
+
+            return StatusCode(StatusCodes.Status503ServiceUnavailable, new
+            {
+                message = "DynamoDB sync bridge is disabled. Use POST /api/workorders/ingest."
+            });
+        }
+
         [HttpPost("WorkOrders")]
         public async Task<IActionResult> SyncWorkOrders()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
             var synced = 0;
             var created = 0;
             var updated = 0;
@@ -62,12 +79,12 @@ namespace Api.SeaHavenIndustries.Controllers
                     var existing = await _db.workOrders
                         .FirstOrDefaultAsync(w => w.ExternalWorkOrderId == externalId);
 
-                    var locationId = await ResolveLocationId(
+                    var (locationId, locationWasCreated) = await ResolveLocationId(
                         GetString(item, "site_code"),
                         GetString(item, "building"),
                         GetString(item, "address"));
 
-                    if (locationId.HasValue && !locationsCreated.Equals(0))
+                    if (locationWasCreated)
                         locationsCreated++;
 
                     if (existing == null)
@@ -138,6 +155,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("Comments")]
         public async Task<IActionResult> SyncComments()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var synced = 0;
             var created = 0;
             var skipped = 0;
@@ -212,6 +232,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("BackfillInternalWONumbers")]
         public async Task<IActionResult> BackfillInternalWONumbers()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var wosMissing = await _db.workOrders
                 .Where(w => w.InternalWONumber == null || w.InternalWONumber == "")
                 .OrderBy(w => w.Id)
@@ -243,6 +266,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("BackfillDispatchNumbers")]
         public async Task<IActionResult> BackfillDispatchNumbers()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var missing = await _db.Dispatches
                 .Where(d => d.DispatchNumber == null || d.DispatchNumber == "")
                 .OrderBy(d => d.Id)
@@ -270,6 +296,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("VendorReplies")]
         public async Task<IActionResult> SyncVendorReplies()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var synced = 0;
             var created = 0;
             var skipped = 0;
@@ -341,6 +370,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("BackfillCommentTypes")]
         public async Task<IActionResult> BackfillCommentTypes()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var updated = await _db.Database.ExecuteSqlRawAsync(
                 "UPDATE Comments SET CommentType = 'customer' WHERE ExternalCommentId IS NOT NULL AND (CommentType IS NULL OR CommentType = '')");
             return Ok(new { updated });
@@ -349,6 +381,9 @@ namespace Api.SeaHavenIndustries.Controllers
         [HttpPost("All")]
         public async Task<IActionResult> SyncAll()
         {
+            if (SyncDisabledResult() is { } disabled)
+                return disabled;
+
             var woResult = await SyncWorkOrders() as OkObjectResult;
             var commentResult = await SyncComments() as OkObjectResult;
 
@@ -359,17 +394,17 @@ namespace Api.SeaHavenIndustries.Controllers
             });
         }
 
-        private async Task<int?> ResolveLocationId(string? siteCode, string? building, string? address)
+        private async Task<(int? LocationId, bool Created)> ResolveLocationId(string? siteCode, string? building, string? address)
         {
             if (string.IsNullOrWhiteSpace(siteCode) && string.IsNullOrWhiteSpace(building))
-                return null;
+                return (null, false);
 
             var matchCode = siteCode ?? building;
             var existing = await _db.Locations
                 .FirstOrDefaultAsync(l => l.Name == matchCode || l.Title == matchCode);
 
             if (existing != null)
-                return existing.Id;
+                return (existing.Id, false);
 
             var location = new Locations
             {
@@ -382,7 +417,7 @@ namespace Api.SeaHavenIndustries.Controllers
             _db.Locations.Add(location);
             await _db.SaveChangesAsync();
 
-            return location.Id;
+            return (location.Id, true);
         }
 
         private static string? GetString(Dictionary<string, AttributeValue> item, string key)
diff --git a/Api.SeaHavenIndustries/Controllers/WorkOrderOpsController.cs b/Api.SeaHavenIndustries/Controllers/WorkOrderOpsController.cs
new file mode 100644
index 0000000..dfbff62
--- /dev/null
+++ b/Api.SeaHavenIndustries/Controllers/WorkOrderOpsController.cs
@@ -0,0 +1,29 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SeaHaven.Services.DTOs;
+using SeaHaven.Services.Interfaces;
+
+namespace Api.SeaHavenIndustries.Controllers
+{
+    /// <summary>Ops health and coexistence metrics (Fase 7).</summary>
+    [Authorize(Roles = "Admin")]
+    [ApiController]
+    [Route("api/workorders/ops")]
+    public class WorkOrderOpsController : ControllerBase
+    {
+        private readonly IWorkOrderOpsHealthService _healthService;
+
+        public WorkOrderOpsController(IWorkOrderOpsHealthService healthService)
+        {
+            _healthService = healthService;
+        }
+
+        [HttpGet("health")]
+        [ProducesResponseType(typeof(WorkOrderOpsHealthDto), StatusCodes.Status200OK)]
+        public async Task<ActionResult<WorkOrderOpsHealthDto>> GetHealth(CancellationToken cancellationToken)
+        {
+            var health = await _healthService.GetHealthAsync(cancellationToken);
+            return Ok(health);
+        }
+    }
+}
diff --git a/Api.SeaHavenIndustries/HostedServices/PastDueCacheHostedService.cs b/Api.SeaHavenIndustries/HostedServices/PastDueCacheHostedService.cs
index 67b8cba..6daf1f7 100644
--- a/Api.SeaHavenIndustries/HostedServices/PastDueCacheHostedService.cs
+++ b/Api.SeaHavenIndustries/HostedServices/PastDueCacheHostedService.cs
@@ -1,6 +1,7 @@
-using Api.SeaHavenIndustries.Options;
 using Microsoft.Extensions.Options;
+using SeaHaven.Services.Implementation;
 using SeaHaven.Services.Interfaces;
+using Api.SeaHavenIndustries.Options;
 
 namespace Api.SeaHavenIndustries.HostedServices
 {
@@ -33,8 +34,8 @@ namespace Api.SeaHavenIndustries.HostedServices
                     var today = DateOnly.FromDateTime(DateTime.UtcNow);
                     if (_lastRunDate != today)
                     {
-                        _lastRunDate = today;
-                        await RunJobAsync(stoppingToken);
+                        if (await RunJobAsync(stoppingToken))
+                            _lastRunDate = today;
                     }
                 }
 
@@ -42,7 +43,7 @@ namespace Api.SeaHavenIndustries.HostedServices
             }
         }
 
-        private async Task RunJobAsync(CancellationToken stoppingToken)
+        private async Task<bool> RunJobAsync(CancellationToken stoppingToken)
         {
             try
             {
@@ -52,11 +53,13 @@ namespace Api.SeaHavenIndustries.HostedServices
 
                 _runState.LastPastDueCacheRunUtc = DateTime.UtcNow;
                 _runState.LastPastDueCacheError = null;
+                return true;
             }
             catch (Exception ex) when (ex is not OperationCanceledException)
             {
                 _runState.LastPastDueCacheError = ex.Message;
                 _logger.LogError(ex, "PastDue cache hosted job failed.");
+                return false;
             }
         }
 
@@ -67,8 +70,7 @@ namespace Api.SeaHavenIndustries.HostedServices
             if (!TimeOnly.TryParse(_options.RunAtUtc, out var runAt))
                 runAt = new TimeOnly(0, 10);
 
-            var current = TimeOnly.FromDateTime(now);
-            return current >= runAt && current < runAt.AddMinutes(1);
+            return TimeOnly.FromDateTime(now) >= runAt;
         }
     }
 }
diff --git a/Api.SeaHavenIndustries/HostedServices/WorkOrderWeekRolledHostedService.cs b/Api.SeaHavenIndustries/HostedServices/WorkOrderWeekRolledHostedService.cs
index 7caf0a2..dc5a309 100644
--- a/Api.SeaHavenIndustries/HostedServices/WorkOrderWeekRolledHostedService.cs
+++ b/Api.SeaHavenIndustries/HostedServices/WorkOrderWeekRolledHostedService.cs
@@ -1,7 +1,8 @@
-using Api.SeaHavenIndustries.Options;
 using Microsoft.Extensions.Options;
 using SeaHaven.Services.Helpers;
+using SeaHaven.Services.Implementation;
 using SeaHaven.Services.Interfaces;
+using Api.SeaHavenIndustries.Options;
 
 namespace Api.SeaHavenIndustries.HostedServices
 {
@@ -34,8 +35,8 @@ namespace Api.SeaHavenIndustries.HostedServices
                     var today = DateOnly.FromDateTime(DateTime.UtcNow);
                     if (_lastRunDate != today)
                     {
-                        _lastRunDate = today;
-                        await RunJobAsync(stoppingToken);
+                        if (await RunJobAsync(stoppingToken))
+                            _lastRunDate = today;
                     }
                 }
 
@@ -43,7 +44,7 @@ namespace Api.SeaHavenIndustries.HostedServices
             }
         }
 
-        private async Task RunJobAsync(CancellationToken stoppingToken)
+        private async Task<bool> RunJobAsync(CancellationToken stoppingToken)
         {
             try
             {
@@ -55,11 +56,13 @@ namespace Api.SeaHavenIndustries.HostedServices
 
                 _runState.LastWeekRolledRunUtc = DateTime.UtcNow;
                 _runState.LastWeekRolledError = null;
+                return true;
             }
             catch (Exception ex) when (ex is not OperationCanceledException)
             {
                 _runState.LastWeekRolledError = ex.Message;
                 _logger.LogError(ex, "WeekRolled hosted job failed.");
+                return false;
             }
         }
 
@@ -75,8 +78,7 @@ namespace Api.SeaHavenIndustries.HostedServices
             if (!TimeOnly.TryParse(_options.RunAtUtc, out var runAt))
                 runAt = new TimeOnly(0, 5);
 
-            var current = TimeOnly.FromDateTime(now);
-            return current >= runAt && current < runAt.AddMinutes(1);
+            return TimeOnly.FromDateTime(now) >= runAt;
         }
     }
 }
diff --git a/Api.SeaHavenIndustries/Options/LegacyEndpointOptions.cs b/Api.SeaHavenIndustries/Options/LegacyEndpointOptions.cs
new file mode 100644
index 0000000..ffd01ef
--- /dev/null
+++ b/Api.SeaHavenIndustries/Options/LegacyEndpointOptions.cs
@@ -0,0 +1,12 @@
+namespace Api.SeaHavenIndustries.Options
+{
+    public class LegacyEndpointOptions
+    {
+        public const string SectionName = "LegacyEndpoints";
+
+        public bool DeprecationEnabled { get; set; }
+
+        /// <summary>ISO date returned in Sunset header (e.g. 2026-12-31).</summary>
+        public string? SunsetDate { get; set; }
+    }
+}
diff --git a/Api.SeaHavenIndustries/Options/SyncOptions.cs b/Api.SeaHavenIndustries/Options/SyncOptions.cs
new file mode 100644
index 0000000..230e16c
--- /dev/null
+++ b/Api.SeaHavenIndustries/Options/SyncOptions.cs
@@ -0,0 +1,10 @@
+namespace Api.SeaHavenIndustries.Options
+{
+    public class SyncOptions
+    {
+        public const string SectionName = "Sync";
+
+        /// <summary>When false, SyncController endpoints return 503 (post-Lambda cutover). Default false to avoid dual-run with ingest.</summary>
+        public bool Enabled { get; set; }
+    }
+}
diff --git a/Api.SeaHavenIndustries/Options/WorkOrderJobRunState.cs b/Api.SeaHavenIndustries/Options/WorkOrderJobRunState.cs
deleted file mode 100644
index dd95de5..0000000
--- a/Api.SeaHavenIndustries/Options/WorkOrderJobRunState.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-namespace Api.SeaHavenIndustries.Options
-{
-    /// <summary>In-memory last-run timestamps for hosted domain jobs (ops health).</summary>
-    public class WorkOrderJobRunState
-    {
-        public DateTime? LastWeekRolledRunUtc { get; set; }
-        public DateTime? LastPastDueCacheRunUtc { get; set; }
-        public string? LastWeekRolledError { get; set; }
-        public string? LastPastDueCacheError { get; set; }
-    }
-}
diff --git a/Api.SeaHavenIndustries/Program.cs b/Api.SeaHavenIndustries/Program.cs
index 922582e..e897f24 100644
--- a/Api.SeaHavenIndustries/Program.cs
+++ b/Api.SeaHavenIndustries/Program.cs
@@ -1,4 +1,4 @@
-using Api.SeaHavenIndustries.Helper;
+using Api.SeaHavenIndustries.Helper;
 using Api.SeaHavenIndustries.HostedServices;
 using Api.SeaHavenIndustries.Options;
 using Data.SeaHavenIndustries;
@@ -11,6 +11,7 @@ using Microsoft.OpenApi.Models;
 using System.Text;
 using SeaHaven.DataServices.DependencyInjection;
 using SeaHaven.Services.DependencyInjection;
+using SeaHaven.Services.Implementation;
 
 var builder = WebApplication.CreateBuilder(args);
 ConfigurationManager configuration = builder.Configuration;
@@ -55,9 +56,35 @@ builder.Services.AddBusinessServices();
 
 builder.Services.Configure<WorkOrderJobsOptions>(
     builder.Configuration.GetSection(WorkOrderJobsOptions.SectionName));
-builder.Services.AddSingleton<WorkOrderJobRunState>();
+builder.Services.AddOptions<WorkOrderIngestOptions>()
+    .Bind(builder.Configuration.GetSection(WorkOrderIngestOptions.SectionName))
+    .Validate(
+        o => !o.Enabled
+            || (!string.IsNullOrWhiteSpace(o.ApiKey)
+                && !o.ApiKey.Contains("${", StringComparison.Ordinal)
+                && o.ApiKey.Length >= 32),
+        "WorkOrderIngest:ApiKey must be a real secret (env/user-secrets, length >= 32) when ingest is enabled.")
+    .ValidateOnStart();
+builder.Services.Configure<SyncOptions>(
+    builder.Configuration.GetSection(SyncOptions.SectionName));
+builder.Services.Configure<LegacyEndpointOptions>(
+    builder.Configuration.GetSection(LegacyEndpointOptions.SectionName));
+builder.Services.AddSingleton<WorkOrderJobRunStateAccessor>();
+builder.Services.AddSingleton(sp => sp.GetRequiredService<WorkOrderJobRunStateAccessor>().State);
+builder.Services.AddScoped<Api.SeaHavenIndustries.Filters.IngestApiKeyFilter>();
 builder.Services.AddHostedService<WorkOrderWeekRolledHostedService>();
 builder.Services.AddHostedService<PastDueCacheHostedService>();
+builder.Services.AddOptions<SeaHaven.Services.Implementation.WorkOrderOpsHealthOptions>()
+    .Configure<Microsoft.Extensions.Options.IOptions<SyncOptions>,
+        Microsoft.Extensions.Options.IOptions<WorkOrderIngestOptions>,
+        Microsoft.Extensions.Options.IOptions<LegacyEndpointOptions>>(
+        (health, sync, ingest, legacy) =>
+        {
+            health.SyncEnabled = sync.Value.Enabled;
+            health.IngestEnabled = ingest.Value.Enabled;
+            health.LegacyDeprecationEnabled = legacy.Value.DeprecationEnabled;
+            health.LegacySunsetDate = legacy.Value.SunsetDate;
+        });
 
 builder.Services.AddAuthentication(options =>
 {
@@ -186,3 +213,4 @@ app.MapControllers();
 //}
 
 app.Run();
+
diff --git a/SeaHaven.Services/Implementation/WorkOrderOpsHealthService.cs b/SeaHaven.Services/Implementation/WorkOrderOpsHealthService.cs
new file mode 100644
index 0000000..11656ed
--- /dev/null
+++ b/SeaHaven.Services/Implementation/WorkOrderOpsHealthService.cs
@@ -0,0 +1,81 @@
+using Data.SeaHavenIndustries;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using SeaHaven.Services.DTOs;
+using SeaHaven.Services.Interfaces;
+
+namespace SeaHaven.Services.Implementation
+{
+    public class WorkOrderOpsHealthService : IWorkOrderOpsHealthService
+    {
+        private readonly ApplicationDbContext _db;
+        private readonly WorkOrderJobRunStateAccessor _runState;
+        private readonly WorkOrderOpsHealthOptions _options;
+
+        public WorkOrderOpsHealthService(
+            ApplicationDbContext db,
+            WorkOrderJobRunStateAccessor runState,
+            IOptions<WorkOrderOpsHealthOptions> options)
+        {
+            _db = db;
+            _runState = runState;
+            _options = options.Value;
+        }
+
+        public async Task<WorkOrderOpsHealthDto> GetHealthAsync(CancellationToken cancellationToken = default)
+        {
+            var since = DateTime.UtcNow.AddHours(-24);
+
+            var syncRejected = await _db.WorkOrderAuditLogs
+                .CountAsync(l => l.Action == "SyncRejected" && l.CreatedAt >= since, cancellationToken);
+
+            var fieldLocks = await _db.WorkOrderFieldLocks.CountAsync(cancellationToken);
+
+            var state = _runState.State;
+            DateTime? ledgerWeekRolled = null;
+            if (await _db.WorkOrderWeekRolledLedgers.AnyAsync(cancellationToken))
+            {
+                ledgerWeekRolled = await _db.WorkOrderWeekRolledLedgers
+                    .MaxAsync(l => (DateTime?)l.ProcessedAt, cancellationToken);
+            }
+
+            return new WorkOrderOpsHealthDto
+            {
+                LastWeekRolledRunUtc = state.LastWeekRolledRunUtc ?? ledgerWeekRolled,
+                LastPastDueCacheRunUtc = state.LastPastDueCacheRunUtc,
+                LastWeekRolledError = state.LastWeekRolledError,
+                LastPastDueCacheError = state.LastPastDueCacheError,
+                SyncRejectedLast24h = syncRejected,
+                FieldLockCount = fieldLocks,
+                SyncEnabled = _options.SyncEnabled,
+                IngestEnabled = _options.IngestEnabled,
+                LegacyDeprecationEnabled = _options.LegacyDeprecationEnabled,
+                LegacySunsetDate = _options.LegacySunsetDate,
+                CheckedAtUtc = DateTime.UtcNow
+            };
+        }
+    }
+
+    /// <summary>Options bridged from API configuration for health snapshots.</summary>
+    public class WorkOrderOpsHealthOptions
+    {
+        public bool SyncEnabled { get; set; } = true;
+        public bool IngestEnabled { get; set; } = true;
+        public bool LegacyDeprecationEnabled { get; set; }
+        public string? LegacySunsetDate { get; set; }
+    }
+
+    /// <summary>Shared in-memory job run timestamps (API hosted services + ops health).</summary>
+    public class WorkOrderJobRunStateAccessor
+    {
+        public WorkOrderJobRunState State { get; } = new();
+    }
+
+    public class WorkOrderJobRunState
+    {
+        public DateTime? LastWeekRolledRunUtc { get; set; }
+        public DateTime? LastPastDueCacheRunUtc { get; set; }
+        public string? LastWeekRolledError { get; set; }
+        public string? LastPastDueCacheError { get; set; }
+    }
+}