[CLAUDE] Domain+App+Infra+Api+FE-Admin+FE-User: S36 Plan G-O2 Phòng họp Mig 36 + BE CRUD + FE 2 app

Phase 10.2 G-O2 Phòng họp BookingCalendar — Mig 36 schema + BE CQRS + FE 2 app
mirror cookie-cutter G-H2 HrmConfig pattern. Standalone không depend workflow.

BE schema (Mig 36 — em main solo Step 4):
- 4 Domain new: MeetingRoom catalog + MeetingBooking header + MeetingBookingAttendee
  join table N-to-N (NOT JSON per Investigator verdict) + Enums (MeetingBookingStatus
  3-state: Confirmed/Cancelled/Completed)
- 3 EF Config: UNIQUE Code + composite index (RoomId, StartAt) range query + UNIQUE
  composite (BookingId, UserId) join
- FK strategy: Room→Restrict (preserve history) + Booking→Cascade attendees +
  User→Restrict (denorm FullName+Email tránh cascade wipe)
- Mig 36 3-file rule + ApplicationDbContextModelSnapshot updated + apply Dev+Design DB

BE CQRS (~584 LOC — Implementer Case 2):
- MeetingFeatures.cs 479 LOC 9 handler: 4 Room CRUD + 5 Booking (List + GetById +
  Create + Update + Cancel)
- SERIALIZABLE transaction overlap check via EXISTS query — throw 409 Conflict
  "Phòng đã được đặt trong khoảng thời gian này"
- MeetingRoomsController 49 LOC + MeetingBookingsController 56 LOC — class-level
  [Authorize] + Roles="Admin" for write
- Application.csproj +Microsoft.EntityFrameworkCore.Relational package (em main fix
  IsolationLevel overload — Implementer gotcha #53 4th truncation diagnose mid-task)
- MenuKeys.cs +4 const (Off_PhongHop sub-group + View/Manage/Book leaf)
- DbInitializer +SeedMeetingRoomsAsync 4 sample (PH-A Phòng họp lớn cap=20 + PH-B
  cap=8 + PHG-501 Giám đốc cap=6 + ONL-1 Online Zoom cap=50) — NOT gated DemoSeed
  per gotcha #51 INFRASTRUCTURE seed

FE 2 app (~1770 LOC × 2 — Implementer Case 2):
- types/meeting.ts × 2 SHA256 IDENTICAL (ce0ad9c6d017cde2) — DTO interface mirror
- MeetingCalendarPage.tsx × 2 SHA256 IDENTICAL (d6d160ae1e4f2285) ~530 LOC — custom
  HTML 7-day grid 8h-20h slot, NO FullCalendar dep (~80 KB bundle saved per
  Investigator verdict alternative)
- MeetingRoomsPage.tsx × 2 SHA256 IDENTICAL (ba35a7ef379a5e9c) ~270 LOC — admin
  catalog CRUD table + Dialog
- 4-place mirror Pattern 16-bis 7× cumulative: types + page + App.tsx route +
  menuKeys + Layout staticMap 3 entry (gotcha #50 silent sidebar drop prevention)

Verify:
- dotnet build SolutionErp.slnx PASS 0 error 2 pre-existing DocxRenderer warning
- dotnet test 130/130 PASS baseline preserve (58 Domain + 72 Infra)
- npm build × 2 app PASS 0 TS error (fe-admin 16.91s bundle 1490 KB / fe-user 8.56s
  bundle 1404 KB, +23 KB gzip both)

Pattern reinforced cumulative S36:
- Pattern 12-bis cross-module mirror 10× (PE → Contract V2 → Hrm → Office)
- Pattern 16-bis 4-place mirror cross-app 7×
- Smart Friend Implementer truncation gotcha #53 4th — mitigation tight brief WORK
  (FE 2 app no truncation, BE truncate diagnose mid only)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Backend/SolutionErp.Api/Controllers/MeetingBookingsController.cs

@@ -0,0 +1,56 @@
+using MediatR;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SolutionErp.Application.Office;
+
+namespace SolutionErp.Api.Controllers;
+
+// Phase 10.2 G-O2 (S36) — Phòng họp Booking API.
+// Class-level [Authorize]: mọi user đăng nhập được book (multi-tenant office use case).
+// Authorization owner-or-admin enforced TRONG handler (UpdateMeetingBookingHandler +
+// CancelMeetingBookingHandler) — controller không restrict role.
+// Pattern 12-bis cross-module mirror HrmConfigsController.cs (S35 cumulative 10×).
+
+[ApiController]
+[Route("api/meeting-bookings")]
+[Authorize]
+public class MeetingBookingsController(IMediator mediator) : ControllerBase
+{
+    [HttpGet]
+    public async Task<List<MeetingBookingDto>> List(
+        [FromQuery] Guid? roomId,
+        [FromQuery] DateTime? startDate,
+        [FromQuery] DateTime? endDate,
+        [FromQuery] bool myOnly,
+        CancellationToken ct)
+        => await mediator.Send(new GetMeetingBookingsQuery(roomId, startDate, endDate, myOnly), ct);
+
+    [HttpGet("{id:guid}")]
+    public async Task<ActionResult<MeetingBookingDto>> GetById(Guid id, CancellationToken ct)
+    {
+        var dto = await mediator.Send(new GetMeetingBookingByIdQuery(id), ct);
+        return dto is null ? NotFound() : Ok(dto);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Create([FromBody] CreateMeetingBookingCommand body, CancellationToken ct)
+    {
+        var id = await mediator.Send(body, ct);
+        return CreatedAtAction(nameof(GetById), new { id }, new { id });
+    }
+
+    [HttpPut("{id:guid}")]
+    public async Task<IActionResult> Update(Guid id, [FromBody] UpdateMeetingBookingCommand body, CancellationToken ct)
+    {
+        if (id != body.Id) return BadRequest("Id mismatch");
+        await mediator.Send(body, ct);
+        return NoContent();
+    }
+
+    [HttpDelete("{id:guid}")]
+    public async Task<IActionResult> Cancel(Guid id, CancellationToken ct)
+    {
+        await mediator.Send(new CancelMeetingBookingCommand(id), ct);
+        return NoContent();
+    }
+}

src/Backend/SolutionErp.Api/Controllers/MeetingRoomsController.cs

@@ -0,0 +1,49 @@
+using MediatR;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SolutionErp.Application.Office;
+
+namespace SolutionErp.Api.Controllers;
+
+// Phase 10.2 G-O2 (S36) — Phòng họp catalog API.
+// Class-level [Authorize]: mọi user đăng nhập được List (FE Booking page cần load room dropdown).
+// Per-action [Authorize(Roles = "Admin")] cho Create/Update/Delete: chỉ admin quản lý catalog.
+// Pattern 12-bis cross-module mirror HrmConfigsController.cs (S35 cumulative 10×).
+
+[ApiController]
+[Route("api/meeting-rooms")]
+[Authorize]
+public class MeetingRoomsController(IMediator mediator) : ControllerBase
+{
+    [HttpGet]
+    public async Task<List<MeetingRoomDto>> List(
+        [FromQuery] string? search,
+        [FromQuery] bool? isActiveOnly,
+        CancellationToken ct)
+        => await mediator.Send(new GetMeetingRoomsQuery(search, isActiveOnly), ct);
+
+    [HttpPost]
+    [Authorize(Roles = "Admin")]
+    public async Task<IActionResult> Create([FromBody] CreateMeetingRoomCommand body, CancellationToken ct)
+    {
+        var id = await mediator.Send(body, ct);
+        return CreatedAtAction(nameof(List), new { id }, new { id });
+    }
+
+    [HttpPut("{id:guid}")]
+    [Authorize(Roles = "Admin")]
+    public async Task<IActionResult> Update(Guid id, [FromBody] UpdateMeetingRoomCommand body, CancellationToken ct)
+    {
+        if (id != body.Id) return BadRequest("Id mismatch");
+        await mediator.Send(body, ct);
+        return NoContent();
+    }
+
+    [HttpDelete("{id:guid}")]
+    [Authorize(Roles = "Admin")]
+    public async Task<IActionResult> Delete(Guid id, CancellationToken ct)
+    {
+        await mediator.Send(new DeleteMeetingRoomCommand(id), ct);
+        return NoContent();
+    }
+}

src/Backend/SolutionErp.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -9,6 +9,7 @@ using SolutionErp.Domain.Identity;
 using SolutionErp.Domain.Master;
 using SolutionErp.Domain.Master.Catalogs;
 using SolutionErp.Domain.Notifications;
+using SolutionErp.Domain.Office;
 using SolutionErp.Domain.PurchaseEvaluations;
 
 namespace SolutionErp.Application.Common.Interfaces;
@@ -103,5 +104,12 @@ public interface IApplicationDbContext
     DbSet<ShiftPattern> ShiftPatterns { get; }
     DbSet<OtPolicy> OtPolicies { get; }
 
+    // Phase 10.2 G-O2 (Mig 36 — S36) — Phòng họp + Booking + Attendee join.
+    // Overlap check qua SERIALIZABLE tx + EXISTS handler (clean-room SOL,
+    // mirror NamGroup TblBookingResource S50 pattern). FullCalendar v6 MIT FE.
+    DbSet<MeetingRoom> MeetingRooms { get; }
+    DbSet<MeetingBooking> MeetingBookings { get; }
+    DbSet<MeetingBookingAttendee> MeetingBookingAttendees { get; }
+
     Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
 }

src/Backend/SolutionErp.Application/Office/MeetingFeatures.cs

@@ -0,0 +1,479 @@
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using SolutionErp.Application.Common.Exceptions;
+using SolutionErp.Application.Common.Interfaces;
+using SolutionErp.Domain.Office;
+
+namespace SolutionErp.Application.Office;
+
+// Phase 10.2 G-O2 (Mig 36 — S36 2026-05-28) — Phòng họp + Booking CQRS.
+// Pattern 12-bis cross-module mirror Hrm/HrmConfigFeatures.cs (S35 cumulative 10×).
+// Pattern 16-bis foundation 4-place modification: entity (done) + config (done)
+// + controller (separate file) + menu/DbInit (DbInitializer SeedMenuTreeAsync extend).
+//
+// Endpoints expose qua MeetingRoomsController + MeetingBookingsController:
+//   GET    /api/meeting-rooms                 — list (filter search + active)
+//   POST   /api/meeting-rooms                 — create [Admin]
+//   PUT    /api/meeting-rooms/{id}            — update [Admin]
+//   DELETE /api/meeting-rooms/{id}            — soft disable IsActive=false [Admin]
+//                                                (NOT IsDeleted vì FK Restrict Booking)
+//   GET    /api/meeting-bookings              — list (room + date range + my filter)
+//   GET    /api/meeting-bookings/{id}         — detail Include Attendees
+//   POST   /api/meeting-bookings              — create (SERIALIZABLE tx overlap check)
+//   PUT    /api/meeting-bookings/{id}         — update (SERIALIZABLE tx exclude self)
+//   DELETE /api/meeting-bookings/{id}         — cancel Status=Cancelled (NOT IsDeleted — preserve history)
+//
+// Investigator verdict S36 pre-flight chốt:
+//   - Overlap check qua System.Data.IsolationLevel.Serializable tx + EXISTS AnyAsync
+//   - Attendees join table N-to-N (MeetingBookingAttendee), NOT JSON array
+//   - 3-state Status enum (Confirmed=1 / Cancelled=2 / Completed=3)
+
+// ===== DTOs =====
+
+public record MeetingRoomDto(
+    Guid Id,
+    string Code,
+    string Name,
+    int Capacity,
+    string? Location,
+    string? Equipment,
+    bool IsActive,
+    DateTime CreatedAt);
+
+public record MeetingBookingAttendeeDto(
+    Guid UserId,
+    string FullName,
+    string? Email,
+    string? Notes);
+
+public record MeetingBookingDto(
+    Guid Id,
+    Guid RoomId,
+    string RoomCode,
+    string RoomName,
+    Guid BookedByUserId,
+    string BookedByFullName,
+    DateTime StartAt,
+    DateTime EndAt,
+    string Title,
+    string? Description,
+    int Status,
+    string? Note,
+    DateTime CreatedAt,
+    List<MeetingBookingAttendeeDto> Attendees);
+
+public record AttendeeInput(Guid UserId, string? Notes);
+
+// ===== Region 1: MeetingRoom CRUD =====
+
+public record GetMeetingRoomsQuery(string? Search = null, bool? IsActiveOnly = null) : IRequest<List<MeetingRoomDto>>;
+public class GetMeetingRoomsHandler(IApplicationDbContext db) : IRequestHandler<GetMeetingRoomsQuery, List<MeetingRoomDto>>
+{
+    public async Task<List<MeetingRoomDto>> Handle(GetMeetingRoomsQuery req, CancellationToken ct)
+    {
+        var q = db.MeetingRooms.AsNoTracking().Where(x => !x.IsDeleted);
+        if (req.IsActiveOnly == true) q = q.Where(x => x.IsActive);
+        if (!string.IsNullOrWhiteSpace(req.Search))
+        {
+            var s = req.Search.ToLower();
+            q = q.Where(x =>
+                x.Code.ToLower().Contains(s) ||
+                x.Name.ToLower().Contains(s) ||
+                (x.Location != null && x.Location.ToLower().Contains(s)));
+        }
+        return await q.OrderBy(x => x.Code)
+            .Select(x => new MeetingRoomDto(
+                x.Id, x.Code, x.Name, x.Capacity, x.Location, x.Equipment, x.IsActive, x.CreatedAt))
+            .ToListAsync(ct);
+    }
+}
+
+public record CreateMeetingRoomCommand(
+    string Code,
+    string Name,
+    int Capacity,
+    string? Location,
+    string? Equipment) : IRequest<Guid>;
+public class CreateMeetingRoomValidator : AbstractValidator<CreateMeetingRoomCommand>
+{
+    public CreateMeetingRoomValidator()
+    {
+        RuleFor(x => x.Code).NotEmpty().MaximumLength(20);
+        RuleFor(x => x.Name).NotEmpty().MaximumLength(200);
+        RuleFor(x => x.Capacity).GreaterThanOrEqualTo(0);
+        RuleFor(x => x.Location).MaximumLength(200);
+        RuleFor(x => x.Equipment).MaximumLength(500);
+    }
+}
+public class CreateMeetingRoomHandler(IApplicationDbContext db) : IRequestHandler<CreateMeetingRoomCommand, Guid>
+{
+    public async Task<Guid> Handle(CreateMeetingRoomCommand req, CancellationToken ct)
+    {
+        if (await db.MeetingRooms.AnyAsync(x => x.Code == req.Code && !x.IsDeleted, ct))
+            throw new ConflictException($"Mã phòng họp '{req.Code}' đã tồn tại.");
+        var entity = new MeetingRoom
+        {
+            Code = req.Code,
+            Name = req.Name,
+            Capacity = req.Capacity,
+            Location = req.Location,
+            Equipment = req.Equipment,
+            IsActive = true,
+        };
+        db.MeetingRooms.Add(entity);
+        await db.SaveChangesAsync(ct);
+        return entity.Id;
+    }
+}
+
+public record UpdateMeetingRoomCommand(
+    Guid Id,
+    string Code,
+    string Name,
+    int Capacity,
+    string? Location,
+    string? Equipment,
+    bool IsActive) : IRequest;
+public class UpdateMeetingRoomValidator : AbstractValidator<UpdateMeetingRoomCommand>
+{
+    public UpdateMeetingRoomValidator()
+    {
+        RuleFor(x => x.Code).NotEmpty().MaximumLength(20);
+        RuleFor(x => x.Name).NotEmpty().MaximumLength(200);
+        RuleFor(x => x.Capacity).GreaterThanOrEqualTo(0);
+        RuleFor(x => x.Location).MaximumLength(200);
+        RuleFor(x => x.Equipment).MaximumLength(500);
+    }
+}
+public class UpdateMeetingRoomHandler(IApplicationDbContext db) : IRequestHandler<UpdateMeetingRoomCommand>
+{
+    public async Task Handle(UpdateMeetingRoomCommand req, CancellationToken ct)
+    {
+        var entity = await db.MeetingRooms.FirstOrDefaultAsync(x => x.Id == req.Id && !x.IsDeleted, ct)
+            ?? throw new NotFoundException("MeetingRoom", req.Id);
+        if (entity.Code != req.Code
+            && await db.MeetingRooms.AnyAsync(x => x.Code == req.Code && x.Id != req.Id && !x.IsDeleted, ct))
+            throw new ConflictException($"Mã phòng họp '{req.Code}' đã tồn tại.");
+        entity.Code = req.Code;
+        entity.Name = req.Name;
+        entity.Capacity = req.Capacity;
+        entity.Location = req.Location;
+        entity.Equipment = req.Equipment;
+        entity.IsActive = req.IsActive;
+        await db.SaveChangesAsync(ct);
+    }
+}
+
+public record DeleteMeetingRoomCommand(Guid Id) : IRequest;
+public class DeleteMeetingRoomHandler(IApplicationDbContext db) : IRequestHandler<DeleteMeetingRoomCommand>
+{
+    public async Task Handle(DeleteMeetingRoomCommand req, CancellationToken ct)
+    {
+        var entity = await db.MeetingRooms.FirstOrDefaultAsync(x => x.Id == req.Id && !x.IsDeleted, ct)
+            ?? throw new NotFoundException("MeetingRoom", req.Id);
+        // FK Restrict Booking → NOT soft delete (IsDeleted=true), chỉ set IsActive=false.
+        // Preserve booking history + future query filter chỉ load room đang active.
+        // Admin có thể toggle IsActive=true lại nếu muốn re-enable.
+        entity.IsActive = false;
+        await db.SaveChangesAsync(ct);
+    }
+}
+
+// ===== Region 2: MeetingBooking CRUD =====
+// Overlap check pattern SERIALIZABLE tx + EXISTS:
+//   - BeginTransactionAsync(IsolationLevel.Serializable, ct)
+//   - AnyAsync(b.RoomId == cmd.RoomId && b.Status == Confirmed && !b.IsDeleted
+//             && b.StartAt < cmd.EndAt && b.EndAt > cmd.StartAt)
+//   - Update: exclude self (b.Id != cmd.Id)
+// SERIALIZABLE đảm bảo 2 concurrent insert overlap không cùng commit (range lock).
+
+public record GetMeetingBookingsQuery(
+    Guid? RoomId = null,
+    DateTime? StartDate = null,
+    DateTime? EndDate = null,
+    bool MyOnly = false) : IRequest<List<MeetingBookingDto>>;
+
+public class GetMeetingBookingsHandler(IApplicationDbContext db, ICurrentUser currentUser)
+    : IRequestHandler<GetMeetingBookingsQuery, List<MeetingBookingDto>>
+{
+    public async Task<List<MeetingBookingDto>> Handle(GetMeetingBookingsQuery req, CancellationToken ct)
+    {
+        var q = db.MeetingBookings.AsNoTracking()
+            .Include(x => x.Room)
+            .Include(x => x.Attendees)
+            .Where(x => !x.IsDeleted);
+
+        if (req.RoomId.HasValue) q = q.Where(x => x.RoomId == req.RoomId.Value);
+        if (req.StartDate.HasValue) q = q.Where(x => x.EndAt >= req.StartDate.Value);
+        if (req.EndDate.HasValue) q = q.Where(x => x.StartAt <= req.EndDate.Value);
+
+        if (req.MyOnly && currentUser.UserId is Guid uid)
+        {
+            // "My bookings" = đã đặt OR được mời (Attendee).
+            q = q.Where(x => x.BookedByUserId == uid || x.Attendees.Any(a => a.UserId == uid));
+        }
+
+        return await q.OrderBy(x => x.StartAt)
+            .Select(x => new MeetingBookingDto(
+                x.Id,
+                x.RoomId,
+                x.Room.Code,
+                x.Room.Name,
+                x.BookedByUserId,
+                x.BookedByFullName,
+                x.StartAt,
+                x.EndAt,
+                x.Title,
+                x.Description,
+                (int)x.Status,
+                x.Note,
+                x.CreatedAt,
+                x.Attendees
+                    .Select(a => new MeetingBookingAttendeeDto(a.UserId, a.FullName, a.Email, a.Notes))
+                    .ToList()))
+            .ToListAsync(ct);
+    }
+}
+
+public record GetMeetingBookingByIdQuery(Guid Id) : IRequest<MeetingBookingDto?>;
+public class GetMeetingBookingByIdHandler(IApplicationDbContext db)
+    : IRequestHandler<GetMeetingBookingByIdQuery, MeetingBookingDto?>
+{
+    public async Task<MeetingBookingDto?> Handle(GetMeetingBookingByIdQuery req, CancellationToken ct)
+    {
+        return await db.MeetingBookings.AsNoTracking()
+            .Include(x => x.Room)
+            .Include(x => x.Attendees)
+            .Where(x => x.Id == req.Id && !x.IsDeleted)
+            .Select(x => new MeetingBookingDto(
+                x.Id,
+                x.RoomId,
+                x.Room.Code,
+                x.Room.Name,
+                x.BookedByUserId,
+                x.BookedByFullName,
+                x.StartAt,
+                x.EndAt,
+                x.Title,
+                x.Description,
+                (int)x.Status,
+                x.Note,
+                x.CreatedAt,
+                x.Attendees
+                    .Select(a => new MeetingBookingAttendeeDto(a.UserId, a.FullName, a.Email, a.Notes))
+                    .ToList()))
+            .FirstOrDefaultAsync(ct);
+    }
+}
+
+public record CreateMeetingBookingCommand(
+    Guid RoomId,
+    DateTime StartAt,
+    DateTime EndAt,
+    string Title,
+    string? Description,
+    string? Note,
+    List<AttendeeInput> Attendees) : IRequest<Guid>;
+
+public class CreateMeetingBookingValidator : AbstractValidator<CreateMeetingBookingCommand>
+{
+    public CreateMeetingBookingValidator()
+    {
+        RuleFor(x => x.RoomId).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty().MaximumLength(200);
+        RuleFor(x => x.Description).MaximumLength(1000);
+        RuleFor(x => x.Note).MaximumLength(500);
+        RuleFor(x => x.Attendees).NotEmpty().WithMessage("Cần ít nhất 1 người tham gia.");
+        RuleFor(x => x).Must(c => c.EndAt > c.StartAt)
+            .WithMessage("Giờ kết thúc phải sau giờ bắt đầu.");
+    }
+}
+
+public class CreateMeetingBookingHandler(IApplicationDbContext db, ICurrentUser currentUser)
+    : IRequestHandler<CreateMeetingBookingCommand, Guid>
+{
+    public async Task<Guid> Handle(CreateMeetingBookingCommand req, CancellationToken ct)
+    {
+        if (currentUser.UserId is not Guid userId)
+            throw new UnauthorizedException();
+
+        // Verify Room exists + IsActive (NotFoundException nếu fail)
+        var roomActive = await db.MeetingRooms
+            .AnyAsync(r => r.Id == req.RoomId && r.IsActive && !r.IsDeleted, ct);
+        if (!roomActive)
+            throw new NotFoundException("MeetingRoom", req.RoomId);
+
+        // SERIALIZABLE transaction — range lock prevent 2 concurrent insert overlap commit.
+        // EXISTS query overlap detect: tồn tại booking Confirmed cùng Room khoảng giao thời.
+        await using var tx = await ((Microsoft.EntityFrameworkCore.DbContext)db)
+            .Database.BeginTransactionAsync(System.Data.IsolationLevel.Serializable, ct);
+
+        var overlap = await db.MeetingBookings.AnyAsync(b =>
+            b.RoomId == req.RoomId &&
+            b.Status == MeetingBookingStatus.Confirmed &&
+            !b.IsDeleted &&
+            b.StartAt < req.EndAt && b.EndAt > req.StartAt,
+            ct);
+        if (overlap)
+            throw new ConflictException("Phòng đã được đặt trong khoảng thời gian này.");
+
+        // Resolve attendee FullName + Email từ Users JOIN (denorm).
+        var attendeeIds = req.Attendees.Select(a => a.UserId).Distinct().ToList();
+        var attendeeUsers = await db.Users.AsNoTracking()
+            .Where(u => attendeeIds.Contains(u.Id))
+            .Select(u => new { u.Id, u.FullName, u.Email })
+            .ToListAsync(ct);
+        var attendeeLookup = attendeeUsers.ToDictionary(u => u.Id);
+
+        var entity = new MeetingBooking
+        {
+            RoomId = req.RoomId,
+            BookedByUserId = userId,
+            BookedByFullName = currentUser.FullName ?? string.Empty,
+            StartAt = req.StartAt,
+            EndAt = req.EndAt,
+            Title = req.Title,
+            Description = req.Description,
+            Note = req.Note,
+            Status = MeetingBookingStatus.Confirmed,
+            Attendees = req.Attendees
+                .Where(a => attendeeLookup.ContainsKey(a.UserId))   // skip user không tồn tại
+                .Select(a => new MeetingBookingAttendee
+                {
+                    UserId = a.UserId,
+                    FullName = attendeeLookup[a.UserId].FullName,
+                    Email = attendeeLookup[a.UserId].Email,
+                    Notes = a.Notes,
+                })
+                .ToList(),
+        };
+        db.MeetingBookings.Add(entity);
+        await db.SaveChangesAsync(ct);
+        await tx.CommitAsync(ct);
+        return entity.Id;
+    }
+}
+
+public record UpdateMeetingBookingCommand(
+    Guid Id,
+    Guid RoomId,
+    DateTime StartAt,
+    DateTime EndAt,
+    string Title,
+    string? Description,
+    string? Note,
+    List<AttendeeInput> Attendees) : IRequest;
+
+public class UpdateMeetingBookingValidator : AbstractValidator<UpdateMeetingBookingCommand>
+{
+    public UpdateMeetingBookingValidator()
+    {
+        RuleFor(x => x.RoomId).NotEmpty();
+        RuleFor(x => x.Title).NotEmpty().MaximumLength(200);
+        RuleFor(x => x.Description).MaximumLength(1000);
+        RuleFor(x => x.Note).MaximumLength(500);
+        RuleFor(x => x.Attendees).NotEmpty().WithMessage("Cần ít nhất 1 người tham gia.");
+        RuleFor(x => x).Must(c => c.EndAt > c.StartAt)
+            .WithMessage("Giờ kết thúc phải sau giờ bắt đầu.");
+    }
+}
+
+public class UpdateMeetingBookingHandler(IApplicationDbContext db, ICurrentUser currentUser)
+    : IRequestHandler<UpdateMeetingBookingCommand>
+{
+    public async Task Handle(UpdateMeetingBookingCommand req, CancellationToken ct)
+    {
+        if (currentUser.UserId is not Guid userId)
+            throw new UnauthorizedException();
+
+        var entity = await db.MeetingBookings
+            .Include(x => x.Attendees)
+            .FirstOrDefaultAsync(x => x.Id == req.Id && !x.IsDeleted, ct)
+            ?? throw new NotFoundException("MeetingBooking", req.Id);
+
+        // Authorization: owner OR Admin role
+        var isOwner = entity.BookedByUserId == userId;
+        var isAdmin = currentUser.Roles.Contains("Admin");
+        if (!isOwner && !isAdmin)
+            throw new ForbiddenException("Chỉ người đặt phòng hoặc Admin được phép sửa booking.");
+
+        // Verify Room exists + IsActive
+        var roomActive = await db.MeetingRooms
+            .AnyAsync(r => r.Id == req.RoomId && r.IsActive && !r.IsDeleted, ct);
+        if (!roomActive)
+            throw new NotFoundException("MeetingRoom", req.RoomId);
+
+        // SERIALIZABLE transaction — overlap check exclude SELF (b.Id != req.Id).
+        await using var tx = await ((Microsoft.EntityFrameworkCore.DbContext)db)
+            .Database.BeginTransactionAsync(System.Data.IsolationLevel.Serializable, ct);
+
+        var overlap = await db.MeetingBookings.AnyAsync(b =>
+            b.Id != req.Id &&
+            b.RoomId == req.RoomId &&
+            b.Status == MeetingBookingStatus.Confirmed &&
+            !b.IsDeleted &&
+            b.StartAt < req.EndAt && b.EndAt > req.StartAt,
+            ct);
+        if (overlap)
+            throw new ConflictException("Phòng đã được đặt trong khoảng thời gian này.");
+
+        // Update header fields
+        entity.RoomId = req.RoomId;
+        entity.StartAt = req.StartAt;
+        entity.EndAt = req.EndAt;
+        entity.Title = req.Title;
+        entity.Description = req.Description;
+        entity.Note = req.Note;
+        // Status preserve (Cancel via separate command).
+
+        // Recreate Attendees: delete existing + re-add (idempotent simpler than diff).
+        var attendeeIds = req.Attendees.Select(a => a.UserId).Distinct().ToList();
+        var attendeeUsers = await db.Users.AsNoTracking()
+            .Where(u => attendeeIds.Contains(u.Id))
+            .Select(u => new { u.Id, u.FullName, u.Email })
+            .ToListAsync(ct);
+        var attendeeLookup = attendeeUsers.ToDictionary(u => u.Id);
+
+        // Remove old (Cascade FK on Booking.Attendees handles cleanup via collection)
+        db.MeetingBookingAttendees.RemoveRange(entity.Attendees);
+        entity.Attendees = req.Attendees
+            .Where(a => attendeeLookup.ContainsKey(a.UserId))
+            .Select(a => new MeetingBookingAttendee
+            {
+                BookingId = entity.Id,
+                UserId = a.UserId,
+                FullName = attendeeLookup[a.UserId].FullName,
+                Email = attendeeLookup[a.UserId].Email,
+                Notes = a.Notes,
+            })
+            .ToList();
+
+        await db.SaveChangesAsync(ct);
+        await tx.CommitAsync(ct);
+    }
+}
+
+public record CancelMeetingBookingCommand(Guid Id) : IRequest;
+public class CancelMeetingBookingHandler(IApplicationDbContext db, ICurrentUser currentUser)
+    : IRequestHandler<CancelMeetingBookingCommand>
+{
+    public async Task Handle(CancelMeetingBookingCommand req, CancellationToken ct)
+    {
+        if (currentUser.UserId is not Guid userId)
+            throw new UnauthorizedException();
+
+        var entity = await db.MeetingBookings
+            .FirstOrDefaultAsync(x => x.Id == req.Id && !x.IsDeleted, ct)
+            ?? throw new NotFoundException("MeetingBooking", req.Id);
+
+        var isOwner = entity.BookedByUserId == userId;
+        var isAdmin = currentUser.Roles.Contains("Admin");
+        if (!isOwner && !isAdmin)
+            throw new ForbiddenException("Chỉ người đặt phòng hoặc Admin được phép huỷ booking.");
+
+        // Status=Cancelled (NOT IsDeleted=true) — preserve history + audit trail.
+        entity.Status = MeetingBookingStatus.Cancelled;
+        await db.SaveChangesAsync(ct);
+    }
+}

src/Backend/SolutionErp.Application/SolutionErp.Application.csproj

@@ -9,6 +9,8 @@
     <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.1.1" />
     <PackageReference Include="MediatR" Version="12.4.1" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.6" />
+    <!-- Relational cần cho IsolationLevel overload BeginTransactionAsync (S36 G-O2 SERIALIZABLE overlap) -->
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.6" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.6" />
   </ItemGroup>
 

src/Backend/SolutionErp.Domain/Identity/MenuKeys.cs

@@ -99,6 +99,11 @@ public static class MenuKeys
     // ============================================================
     public const string Off = "Off";                                // root group văn phòng số
     public const string OffDanhBa = "Off_DanhBa";                   // Danh bạ nội bộ (card grid)
+    // Phase 10.2 G-O2 (Mig 36 — S36 2026-05-28) — Phòng họp + Booking calendar.
+    public const string OffPhongHop = "Off_PhongHop";                          // sub-group phòng họp
+    public const string OffPhongHopView = "Off_PhongHop_View";                 // Xem lịch (FullCalendar)
+    public const string OffPhongHopManage = "Off_PhongHop_Manage";             // Quản lý phòng (Admin CRUD MeetingRoom)
+    public const string OffPhongHopBook = "Off_PhongHop_Book";                 // Đặt phòng (Create/Update/Cancel Booking)
 
     public static readonly string[] PurchaseEvaluationTypeCodes =
         ["DuyetNcc", "DuyetNccPhuongAn"];
@@ -127,6 +132,7 @@ public static class MenuKeys
         Hrm, HrmHoSo,                                                                            // Mig 34 — Phase 10.1
         HrmConfig, HrmConfigLeaveTypes, HrmConfigHolidays, HrmConfigShifts, HrmConfigOtPolicies, // Mig 35 — Phase 10.2 G-H2
         Off, OffDanhBa,                                                                          // Phase 10.2 G-O1 — Văn phòng số
+        OffPhongHop, OffPhongHopView, OffPhongHopManage, OffPhongHopBook,                        // Phase 10.2 G-O2 — Phòng họp
         System, Users, Roles, Permissions, MenuVisibility, Workflows, PeWorkflows,
         ApprovalWorkflowsV2, ApprovalWorkflowDuyetNccV2, ApprovalWorkflowDuyetNccPhuongAnV2,    // Mig 22
     ];

src/Backend/SolutionErp.Domain/Office/Enums.cs

@@ -0,0 +1,12 @@
+namespace SolutionErp.Domain.Office;
+
+// Phase 10.2 G-O2 — Phòng họp BookingCalendar enum.
+// Reference NamGroup TblBookingResource TrangThai 4-state (NamGroup S50)
+// — SOL adapt 3-state, drop "Rejected" (use Cancelled instead).
+
+public enum MeetingBookingStatus
+{
+    Confirmed = 1,    // Đã xác nhận (default sau Create)
+    Cancelled = 2,    // Đã huỷ
+    Completed = 3,    // Đã kết thúc (auto-set khi EndAt < Now via job/manual)
+}

src/Backend/SolutionErp.Domain/Office/MeetingBooking.cs

@@ -0,0 +1,29 @@
+using SolutionErp.Domain.Common;
+
+namespace SolutionErp.Domain.Office;
+
+// Phase 10.2 G-O2 (Mig 36 — S36) — Booking phòng họp.
+// Overlap check qua SERIALIZABLE tx + EXISTS query trong handler
+// (NOT DB constraint vì datetime range not native SQL Server).
+// Reference NamGroup TblBookingResource S50 — SOL adapt 3-state status.
+public class MeetingBooking : AuditableEntity
+{
+    public Guid RoomId { get; set; }
+    public MeetingRoom Room { get; set; } = null!;        // FK Restrict — không xoá Room còn booking active
+
+    public Guid BookedByUserId { get; set; }              // User đặt phòng (Creator semantics)
+    public string BookedByFullName { get; set; } = string.Empty;  // denorm tránh cascade
+
+    public DateTime StartAt { get; set; }                 // UTC datetime2
+    public DateTime EndAt { get; set; }                   // UTC datetime2. EndAt > StartAt (validator)
+
+    public string Title { get; set; } = string.Empty;     // "Họp giao ban tuần", "Phỏng vấn ứng viên"
+    public string? Description { get; set; }              // Nội dung chi tiết / agenda
+
+    public MeetingBookingStatus Status { get; set; } = MeetingBookingStatus.Confirmed;
+
+    public string? Note { get; set; }                     // Ghi chú thêm (vd "Cần chuẩn bị nước uống")
+
+    // Attendees nav — collection join entity (NOT JSON, theo Investigator verdict S36)
+    public List<MeetingBookingAttendee> Attendees { get; set; } = new();
+}

src/Backend/SolutionErp.Domain/Office/MeetingBookingAttendee.cs

@@ -0,0 +1,21 @@
+using SolutionErp.Domain.Common;
+
+namespace SolutionErp.Domain.Office;
+
+// Phase 10.2 G-O2 (Mig 36 — S36) — Attendee join table N-to-N.
+// Composite PK (BookingId, UserId) — không support add user 2 lần cùng booking.
+// FK Cascade Booking (xoá Booking → wipe Attendees) + Restrict User
+// (admin không xoá user còn invite — denorm name preserve).
+// Reference Investigator verdict: prefer join table over JSON array
+// để index query Notification push + reuse Users API multi-select FE.
+public class MeetingBookingAttendee : BaseEntity   // NO IsDeleted — composite PK delete entire row
+{
+    public Guid BookingId { get; set; }
+    public MeetingBooking Booking { get; set; } = null!;
+
+    public Guid UserId { get; set; }
+    public string FullName { get; set; } = string.Empty;     // denorm tránh JOIN cho Notification push
+    public string? Email { get; set; }                       // denorm cho email outbox future
+
+    public string? Notes { get; set; }                       // "Vắng buổi sáng", "Tham gia online"
+}

src/Backend/SolutionErp.Domain/Office/MeetingRoom.cs

@@ -0,0 +1,23 @@
+using SolutionErp.Domain.Common;
+
+namespace SolutionErp.Domain.Office;
+
+// Phase 10.2 G-O2 (Mig 36 — S36 2026-05-28) — Phòng họp catalog.
+// Reference NamGroup TblResource 11 cols (S50 design) — SOL adapt clean-room
+// 3 entity: MeetingRoom (catalog) + MeetingBooking (header) + MeetingBookingAttendee (join).
+// AuditableEntity inherit chuẩn SOL Clean Arch.
+public class MeetingRoom : AuditableEntity
+{
+    public string Code { get; set; } = string.Empty;       // UNIQUE — "PH-A", "PH-B", "PHG-501"
+    public string Name { get; set; } = string.Empty;       // "Phòng họp tầng 5", "Phòng họp lớn"
+
+    // Sức chứa tối đa (số người). 0 = không giới hạn (mở rộng tự do).
+    public int Capacity { get; set; }
+
+    public string? Location { get; set; }                  // "Tầng 5, Toà A" / "Trực tuyến Zoom"
+
+    // Trang thiết bị có sẵn (free text): "Máy chiếu, Bảng trắng, Wifi" — info-only.
+    public string? Equipment { get; set; }
+
+    public bool IsActive { get; set; } = true;             // Soft-disable không xoá (preserve booking history)
+}

src/Backend/SolutionErp.Infrastructure/Persistence/ApplicationDbContext.cs

@@ -11,6 +11,7 @@ using SolutionErp.Domain.Identity;
 using SolutionErp.Domain.Master;
 using SolutionErp.Domain.Master.Catalogs;
 using SolutionErp.Domain.Notifications;
+using SolutionErp.Domain.Office;
 using SolutionErp.Domain.PurchaseEvaluations;
 
 namespace SolutionErp.Infrastructure.Persistence;
@@ -96,6 +97,11 @@ public class ApplicationDbContext
     public DbSet<ShiftPattern> ShiftPatterns => Set<ShiftPattern>();
     public DbSet<OtPolicy> OtPolicies => Set<OtPolicy>();
 
+    // Phase 10.2 G-O2 (Mig 36 — S36) — Phòng họp + Booking + Attendee join.
+    public DbSet<MeetingRoom> MeetingRooms => Set<MeetingRoom>();
+    public DbSet<MeetingBooking> MeetingBookings => Set<MeetingBooking>();
+    public DbSet<MeetingBookingAttendee> MeetingBookingAttendees => Set<MeetingBookingAttendee>();
+
     protected override void OnModelCreating(ModelBuilder builder)
     {
         base.OnModelCreating(builder);

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/MeetingBookingAttendeeConfiguration.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SolutionErp.Domain.Office;
+
+namespace SolutionErp.Infrastructure.Persistence.Configurations;
+
+// EF Mig 36 G-O2 (S36) — Attendee join table N-to-N.
+// Composite UNIQUE (BookingId, UserId) — không add user 2 lần cùng booking.
+// Inherit BaseEntity (Guid Id auto) + composite UNIQUE constraint via index.
+public class MeetingBookingAttendeeConfiguration : IEntityTypeConfiguration<MeetingBookingAttendee>
+{
+    public void Configure(EntityTypeBuilder<MeetingBookingAttendee> e)
+    {
+        e.ToTable("MeetingBookingAttendees");
+
+        e.Property(x => x.FullName).HasMaxLength(200).IsRequired();
+        e.Property(x => x.Email).HasMaxLength(200);
+        e.Property(x => x.Notes).HasMaxLength(200);
+
+        // UNIQUE composite — 1 user / 1 booking
+        e.HasIndex(x => new { x.BookingId, x.UserId }).IsUnique();
+        // UserId lookup "my invites"
+        e.HasIndex(x => x.UserId);
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/MeetingBookingConfiguration.cs

@@ -0,0 +1,37 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SolutionErp.Domain.Office;
+
+namespace SolutionErp.Infrastructure.Persistence.Configurations;
+
+// EF Mig 36 G-O2 (S36) — Booking phòng họp.
+// FK Restrict cho Room (preserve history) + Restrict User Drafter (denorm name).
+// Index composite (RoomId, StartAt) cho range query overlap check + calendar fetch.
+public class MeetingBookingConfiguration : IEntityTypeConfiguration<MeetingBooking>
+{
+    public void Configure(EntityTypeBuilder<MeetingBooking> e)
+    {
+        e.ToTable("MeetingBookings");
+
+        e.Property(x => x.BookedByFullName).HasMaxLength(200).IsRequired();
+        e.Property(x => x.Title).HasMaxLength(200).IsRequired();
+        e.Property(x => x.Description).HasMaxLength(1000);
+        e.Property(x => x.Note).HasMaxLength(500);
+        e.Property(x => x.Status).HasConversion<int>();
+
+        e.HasOne(x => x.Room)
+            .WithMany()
+            .HasForeignKey(x => x.RoomId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        e.HasMany(x => x.Attendees)
+            .WithOne(a => a.Booking)
+            .HasForeignKey(a => a.BookingId)
+            .OnDelete(DeleteBehavior.Cascade);
+
+        // Range query + overlap check (RoomId + StartAt)
+        e.HasIndex(x => new { x.RoomId, x.StartAt });
+        // BookedByUserId lookup "my bookings"
+        e.HasIndex(x => x.BookedByUserId);
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/MeetingRoomConfiguration.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using SolutionErp.Domain.Office;
+
+namespace SolutionErp.Infrastructure.Persistence.Configurations;
+
+// EF Mig 36 G-O2 (S36) — Phòng họp catalog. Standalone no FK.
+// Mirror LeaveType pattern (no HasQueryFilter — handler explicit Where(!IsDeleted)).
+public class MeetingRoomConfiguration : IEntityTypeConfiguration<MeetingRoom>
+{
+    public void Configure(EntityTypeBuilder<MeetingRoom> e)
+    {
+        e.ToTable("MeetingRooms");
+
+        e.Property(x => x.Code).HasMaxLength(20).IsRequired();
+        e.Property(x => x.Name).HasMaxLength(200).IsRequired();
+        e.Property(x => x.Location).HasMaxLength(200);
+        e.Property(x => x.Equipment).HasMaxLength(500);
+
+        e.HasIndex(x => x.Code).IsUnique();
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs

@@ -11,6 +11,7 @@ using SolutionErp.Domain.Hrm;
 using SolutionErp.Domain.Identity;
 using SolutionErp.Domain.Master;
 using SolutionErp.Domain.Master.Catalogs;
+using SolutionErp.Domain.Office;
 using SolutionErp.Domain.PurchaseEvaluations;
 
 namespace SolutionErp.Infrastructure.Persistence;
@@ -95,6 +96,9 @@ public static class DbInitializer
         // Plan G-H2 (Mig 35 S34 2026-05-27) — Cấu hình HRM 4 catalog. Infrastructure
         // data (NOT gated DemoSeed flag) — Workflow Apps reference cần data ngày 1.
         await SeedHrmConfigsAsync(db, logger);
+        // Plan G-O2 (Mig 36 S36 2026-05-28) — Phòng họp 4 sample room. Infrastructure
+        // data (NOT gated DemoSeed flag, gotcha #51) — admin có thể edit/delete sau.
+        await SeedMeetingRoomsAsync(db, logger);
         await SeedMenuTreeAsync(db, logger);
         await SeedAdminPermissionsAsync(db, roleManager, logger);
         await SeedDemoMasterDataAsync(db, logger);
@@ -1498,6 +1502,11 @@ public static class DbInitializer
             // Future leaf: Off_PhongHop (G-O2) + workflow apps Off_DeXuat/DonTu/DatXe/ItTicket.
             (MenuKeys.Off,           "Văn phòng số",        null,            29, "Briefcase"),
             (MenuKeys.OffDanhBa,     "Danh bạ nội bộ",      MenuKeys.Off,     1, "BookUser"),
+            // Phase 10.2 G-O2 (Mig 36 — S36 2026-05-28). Sub-group "Phòng họp" + 3 leaf.
+            (MenuKeys.OffPhongHop,       "Phòng họp",       MenuKeys.Off,         2, "CalendarRange"),
+            (MenuKeys.OffPhongHopView,   "Xem lịch",        MenuKeys.OffPhongHop, 1, "CalendarDays"),
+            (MenuKeys.OffPhongHopManage, "Quản lý phòng",   MenuKeys.OffPhongHop, 2, "Building2"),
+            (MenuKeys.OffPhongHopBook,   "Đặt phòng",       MenuKeys.OffPhongHop, 3, "CalendarPlus"),
         };
 
         // Per-type sub-menu under Contracts: 1 group + 3 leaves each
@@ -2156,4 +2165,49 @@ public static class DbInitializer
         await db.SaveChangesAsync();
         logger.LogInformation("SeedHrmConfigsAsync: seeded 5 LeaveTypes + 10 Holidays 2026 + 3 ShiftPatterns + 1 OtPolicy default.");
     }
+
+    // Plan G-O2 (Mig 36 — S36 2026-05-28). 4 sample MeetingRoom seed.
+    // Infrastructure data (NOT gated DemoSeed flag, gotcha #51) — Booking calendar
+    // cần dropdown phòng ngày 1. Admin có thể edit/delete/disable qua FE Manage page.
+    // Idempotent: skip nếu đã có row.
+    private static async Task SeedMeetingRoomsAsync(ApplicationDbContext db, ILogger logger)
+    {
+        if (await db.MeetingRooms.AnyAsync())
+        {
+            logger.LogInformation("SeedMeetingRoomsAsync: skip — đã có MeetingRoom.");
+            return;
+        }
+
+        db.MeetingRooms.AddRange(
+            new MeetingRoom
+            {
+                Code = "PH-A", Name = "Phòng họp lớn",
+                Capacity = 20, Location = "Tầng 5, Toà A",
+                Equipment = "Máy chiếu, Bảng trắng, Wifi, Webcam 4K",
+                IsActive = true,
+            },
+            new MeetingRoom
+            {
+                Code = "PH-B", Name = "Phòng họp nhỏ",
+                Capacity = 8, Location = "Tầng 3, Toà A",
+                Equipment = "TV 55 inch, Bảng trắng",
+                IsActive = true,
+            },
+            new MeetingRoom
+            {
+                Code = "PHG-501", Name = "Phòng Giám đốc",
+                Capacity = 6, Location = "Tầng 5, Toà A",
+                Equipment = "TV 65 inch, Bàn họp dài, Tủ tài liệu",
+                IsActive = true,
+            },
+            new MeetingRoom
+            {
+                Code = "ONL-1", Name = "Trực tuyến Zoom",
+                Capacity = 50, Location = "Online",
+                Equipment = "License Zoom Pro, link cố định",
+                IsActive = true,
+            });
+        await db.SaveChangesAsync();
+        logger.LogInformation("SeedMeetingRoomsAsync: seeded 4 sample meeting rooms (PH-A/PH-B/PHG-501/ONL-1).");
+    }
 }

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260528074125_AddMeetingRooms.cs

@@ -0,0 +1,138 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SolutionErp.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddMeetingRooms : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "MeetingRooms",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    Code = table.Column<string>(type: "nvarchar(20)", maxLength: 20, nullable: false),
+                    Name = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    Capacity = table.Column<int>(type: "int", nullable: false),
+                    Location = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    Equipment = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: true),
+                    IsActive = table.Column<bool>(type: "bit", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    CreatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    UpdatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    IsDeleted = table.Column<bool>(type: "bit", nullable: false),
+                    DeletedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    DeletedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_MeetingRooms", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "MeetingBookings",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    RoomId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    BookedByUserId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    BookedByFullName = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    StartAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    EndAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    Title = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    Description = table.Column<string>(type: "nvarchar(1000)", maxLength: 1000, nullable: true),
+                    Status = table.Column<int>(type: "int", nullable: false),
+                    Note = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    CreatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    UpdatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    IsDeleted = table.Column<bool>(type: "bit", nullable: false),
+                    DeletedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    DeletedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_MeetingBookings", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_MeetingBookings_MeetingRooms_RoomId",
+                        column: x => x.RoomId,
+                        principalTable: "MeetingRooms",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "MeetingBookingAttendees",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    BookingId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    UserId = table.Column<Guid>(type: "uniqueidentifier", nullable: false),
+                    FullName = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: false),
+                    Email = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    Notes = table.Column<string>(type: "nvarchar(200)", maxLength: 200, nullable: true),
+                    CreatedAt = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime2", nullable: true),
+                    CreatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true),
+                    UpdatedBy = table.Column<Guid>(type: "uniqueidentifier", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_MeetingBookingAttendees", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_MeetingBookingAttendees_MeetingBookings_BookingId",
+                        column: x => x.BookingId,
+                        principalTable: "MeetingBookings",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MeetingBookingAttendees_BookingId_UserId",
+                table: "MeetingBookingAttendees",
+                columns: new[] { "BookingId", "UserId" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MeetingBookingAttendees_UserId",
+                table: "MeetingBookingAttendees",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MeetingBookings_BookedByUserId",
+                table: "MeetingBookings",
+                column: "BookedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MeetingBookings_RoomId_StartAt",
+                table: "MeetingBookings",
+                columns: new[] { "RoomId", "StartAt" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MeetingRooms_Code",
+                table: "MeetingRooms",
+                column: "Code",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "MeetingBookingAttendees");
+
+            migrationBuilder.DropTable(
+                name: "MeetingBookings");
+
+            migrationBuilder.DropTable(
+                name: "MeetingRooms");
+        }
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -3448,6 +3448,181 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.ToTable("Notifications", (string)null);
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingBooking", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("BookedByFullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<Guid>("BookedByUserId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("CreatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime?>("DeletedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("DeletedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(1000)
+                        .HasColumnType("nvarchar(1000)");
+
+                    b.Property<DateTime>("EndAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Note")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<Guid>("RoomId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("StartAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<int>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("UpdatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("BookedByUserId");
+
+                    b.HasIndex("RoomId", "StartAt");
+
+                    b.ToTable("MeetingBookings", (string)null);
+                });
+
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingBookingAttendee", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("BookingId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("CreatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("FullName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("UpdatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.HasIndex("BookingId", "UserId")
+                        .IsUnique();
+
+                    b.ToTable("MeetingBookingAttendees", (string)null);
+                });
+
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingRoom", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<int>("Capacity")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Code")
+                        .IsRequired()
+                        .HasMaxLength(20)
+                        .HasColumnType("nvarchar(20)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("CreatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTime?>("DeletedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("DeletedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("Equipment")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsDeleted")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Location")
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("nvarchar(200)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.Property<Guid?>("UpdatedBy")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Code")
+                        .IsUnique();
+
+                    b.ToTable("MeetingRooms", (string)null);
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluation", b =>
                 {
                     b.Property<Guid>("Id")
@@ -4690,6 +4865,28 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                         .OnDelete(DeleteBehavior.Restrict);
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingBooking", b =>
+                {
+                    b.HasOne("SolutionErp.Domain.Office.MeetingRoom", "Room")
+                        .WithMany()
+                        .HasForeignKey("RoomId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Room");
+                });
+
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingBookingAttendee", b =>
+                {
+                    b.HasOne("SolutionErp.Domain.Office.MeetingBooking", "Booking")
+                        .WithMany("Attendees")
+                        .HasForeignKey("BookingId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Booking");
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluation", b =>
                 {
                     b.HasOne("SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflow", null)
@@ -4924,6 +5121,11 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                     b.Navigation("Permissions");
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.Office.MeetingBooking", b =>
+                {
+                    b.Navigation("Attendees");
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluation", b =>
                 {
                     b.Navigation("Approvals");