diff --git a/packages/audit_log/seed/scripts/db/operations.lua b/packages/audit_log/seed/scripts/db/operations.lua
new file mode 100644
index 000000000..0c627ffbf
--- /dev/null
+++ b/packages/audit_log/seed/scripts/db/operations.lua
@@ -0,0 +1,238 @@
+-- audit_log/seed/scripts/db/operations.lua
+-- DBAL operations for AuditLog entity
+-- @module audit_log.db.operations
+
+local M = {}
+
+---@class AuditLogCreateParams
+---@field tenantId string
+---@field userId string|nil
+---@field username string|nil
+---@field action string
+---@field entity string
+---@field entityId string|nil
+---@field oldValue table|nil
+---@field newValue table|nil
+---@field ipAddress string|nil
+---@field userAgent string|nil
+---@field details table|nil
+
+---Create a new audit log entry
+---@param dbal table DBAL client instance
+---@param params AuditLogCreateParams
+---@return table Created audit log record
+function M.create(dbal, params)
+  local json = require('json')
+  
+  return dbal:create('AuditLog', {
+    tenantId = params.tenantId,
+    userId = params.userId,
+    username = params.username,
+    action = params.action,
+    entity = params.entity,
+    entityId = params.entityId,
+    oldValue = params.oldValue and json.encode(params.oldValue) or nil,
+    newValue = params.newValue and json.encode(params.newValue) or nil,
+    ipAddress = params.ipAddress,
+    userAgent = params.userAgent,
+    details = params.details and json.encode(params.details) or nil,
+    timestamp = os.time() * 1000,
+  })
+end
+
+---@class AuditLogListParams
+---@field tenantId string
+---@field userId string|nil
+---@field action string|nil
+---@field entity string|nil
+---@field entityId string|nil
+---@field startTime number|nil Unix timestamp
+---@field endTime number|nil Unix timestamp
+---@field take number|nil
+---@field skip number|nil
+
+---List audit logs with filters
+---@param dbal table DBAL client instance
+---@param params AuditLogListParams
+---@return table[] List of audit log records
+function M.list(dbal, params)
+  local where = { tenantId = params.tenantId }
+  
+  if params.userId then
+    where.userId = params.userId
+  end
+  
+  if params.action then
+    where.action = params.action
+  end
+  
+  if params.entity then
+    where.entity = params.entity
+  end
+  
+  if params.entityId then
+    where.entityId = params.entityId
+  end
+  
+  -- Time range filtering would need DBAL support for comparison operators
+  -- For now, return all and filter in Lua
+  local result = dbal:list('AuditLog', {
+    where = where,
+    orderBy = { timestamp = 'desc' },
+    take = params.take or 50,
+    skip = params.skip or 0,
+  })
+  
+  -- Filter by time range if specified
+  if params.startTime or params.endTime then
+    local filtered = {}
+    for _, log in ipairs(result.items or {}) do
+      local ts = log.timestamp
+      local inRange = true
+      
+      if params.startTime and ts < (params.startTime * 1000) then
+        inRange = false
+      end
+      
+      if params.endTime and ts > (params.endTime * 1000) then
+        inRange = false
+      end
+      
+      if inRange then
+        table.insert(filtered, log)
+      end
+    end
+    result.items = filtered
+  end
+  
+  return result
+end
+
+---Get audit logs for a specific entity
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param entity string Entity type
+---@param entityId string Entity ID
+---@return table[] Audit history for entity
+function M.getEntityHistory(dbal, tenantId, entity, entityId)
+  return M.list(dbal, {
+    tenantId = tenantId,
+    entity = entity,
+    entityId = entityId,
+    take = 100,
+  })
+end
+
+---Get audit logs for a specific user
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param take number|nil
+---@return table[] User's audit history
+function M.getUserHistory(dbal, tenantId, userId, take)
+  return M.list(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    take = take or 50,
+  })
+end
+
+---Log a create action
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param entity string
+---@param entityId string
+---@param newValue table Created record
+---@param context table|nil Additional context
+function M.logCreate(dbal, tenantId, userId, entity, entityId, newValue, context)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    action = 'create',
+    entity = entity,
+    entityId = entityId,
+    newValue = newValue,
+    details = context,
+  })
+end
+
+---Log an update action
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param entity string
+---@param entityId string
+---@param oldValue table Previous state
+---@param newValue table New state
+---@param context table|nil Additional context
+function M.logUpdate(dbal, tenantId, userId, entity, entityId, oldValue, newValue, context)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    action = 'update',
+    entity = entity,
+    entityId = entityId,
+    oldValue = oldValue,
+    newValue = newValue,
+    details = context,
+  })
+end
+
+---Log a delete action
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param entity string
+---@param entityId string
+---@param oldValue table Deleted record
+---@param context table|nil Additional context
+function M.logDelete(dbal, tenantId, userId, entity, entityId, oldValue, context)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    action = 'delete',
+    entity = entity,
+    entityId = entityId,
+    oldValue = oldValue,
+    details = context,
+  })
+end
+
+---Log a login action
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param username string
+---@param ipAddress string|nil
+---@param userAgent string|nil
+function M.logLogin(dbal, tenantId, userId, username, ipAddress, userAgent)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    username = username,
+    action = 'login',
+    entity = 'User',
+    entityId = userId,
+    ipAddress = ipAddress,
+    userAgent = userAgent,
+  })
+end
+
+---Log a logout action
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@param userId string
+---@param username string
+function M.logLogout(dbal, tenantId, userId, username)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    username = username,
+    action = 'logout',
+    entity = 'User',
+    entityId = userId,
+  })
+end
+
+return M
diff --git a/packages/notification_center/seed/scripts/db/operations.lua b/packages/notification_center/seed/scripts/db/operations.lua
new file mode 100644
index 000000000..e24947318
--- /dev/null
+++ b/packages/notification_center/seed/scripts/db/operations.lua
@@ -0,0 +1,241 @@
+-- notification_center/seed/scripts/db/operations.lua
+-- DBAL operations for Notification entity
+-- @module notification_center.db.operations
+
+local M = {}
+
+---@class NotificationCreateParams
+---@field tenantId string
+---@field userId string
+---@field type string info|warning|success|error|mention|reply|follow|like|system
+---@field title string
+---@field message string
+---@field icon string|nil
+---@field data table|nil
+---@field expiresAt number|nil Unix timestamp
+
+---Create a new notification
+---@param dbal table DBAL client instance
+---@param params NotificationCreateParams
+---@return table Created notification
+function M.create(dbal, params)
+  local json = require('json')
+  
+  return dbal:create('Notification', {
+    tenantId = params.tenantId,
+    userId = params.userId,
+    type = params.type,
+    title = params.title,
+    message = params.message,
+    icon = params.icon,
+    read = false,
+    data = params.data and json.encode(params.data) or nil,
+    createdAt = os.time() * 1000,
+    expiresAt = params.expiresAt and (params.expiresAt * 1000) or nil,
+  })
+end
+
+---List notifications for a user
+---@param dbal table DBAL client instance
+---@param userId string
+---@param unreadOnly boolean|nil Only return unread notifications
+---@param take number|nil
+---@param skip number|nil
+---@return table List result with items and total
+function M.list(dbal, userId, unreadOnly, take, skip)
+  local where = { userId = userId }
+  
+  if unreadOnly then
+    where.read = false
+  end
+  
+  return dbal:list('Notification', {
+    where = where,
+    orderBy = { createdAt = 'desc' },
+    take = take or 20,
+    skip = skip or 0,
+  })
+end
+
+---Get unread notification count
+---@param dbal table DBAL client instance
+---@param userId string
+---@return number Unread count
+function M.getUnreadCount(dbal, userId)
+  local result = M.list(dbal, userId, true, 1000, 0)
+  return result.total or #(result.items or {})
+end
+
+---Mark a notification as read
+---@param dbal table DBAL client instance
+---@param notificationId string
+---@return table Updated notification
+function M.markAsRead(dbal, notificationId)
+  return dbal:update('Notification', notificationId, {
+    read = true,
+  })
+end
+
+---Mark all notifications as read for a user
+---@param dbal table DBAL client instance
+---@param userId string
+---@return number Number of notifications updated
+function M.markAllAsRead(dbal, userId)
+  local unread = M.list(dbal, userId, true, 1000, 0)
+  local count = 0
+  
+  for _, notification in ipairs(unread.items or {}) do
+    dbal:update('Notification', notification.id, { read = true })
+    count = count + 1
+  end
+  
+  return count
+end
+
+---Delete a notification
+---@param dbal table DBAL client instance
+---@param notificationId string
+---@return boolean Success
+function M.delete(dbal, notificationId)
+  return dbal:delete('Notification', notificationId)
+end
+
+---Delete all read notifications for a user
+---@param dbal table DBAL client instance
+---@param userId string
+---@return number Number deleted
+function M.deleteRead(dbal, userId)
+  local result = dbal:list('Notification', {
+    where = { userId = userId, read = true },
+    take = 1000,
+  })
+  
+  local count = 0
+  for _, notification in ipairs(result.items or {}) do
+    dbal:delete('Notification', notification.id)
+    count = count + 1
+  end
+  
+  return count
+end
+
+---Delete expired notifications
+---@param dbal table DBAL client instance
+---@param tenantId string
+---@return number Number deleted
+function M.deleteExpired(dbal, tenantId)
+  local now = os.time() * 1000
+  local result = dbal:list('Notification', {
+    where = { tenantId = tenantId },
+    take = 1000,
+  })
+  
+  local count = 0
+  for _, notification in ipairs(result.items or {}) do
+    if notification.expiresAt and notification.expiresAt < now then
+      dbal:delete('Notification', notification.id)
+      count = count + 1
+    end
+  end
+  
+  return count
+end
+
+-- Convenience functions for creating typed notifications
+
+---Send an info notification
+---@param dbal table
+---@param tenantId string
+---@param userId string
+---@param title string
+---@param message string
+---@param data table|nil
+function M.sendInfo(dbal, tenantId, userId, title, message, data)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    type = 'info',
+    title = title,
+    message = message,
+    icon = 'Info',
+    data = data,
+  })
+end
+
+---Send a success notification
+---@param dbal table
+---@param tenantId string
+---@param userId string
+---@param title string
+---@param message string
+---@param data table|nil
+function M.sendSuccess(dbal, tenantId, userId, title, message, data)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    type = 'success',
+    title = title,
+    message = message,
+    icon = 'CheckCircle',
+    data = data,
+  })
+end
+
+---Send a warning notification
+---@param dbal table
+---@param tenantId string
+---@param userId string
+---@param title string
+---@param message string
+---@param data table|nil
+function M.sendWarning(dbal, tenantId, userId, title, message, data)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    type = 'warning',
+    title = title,
+    message = message,
+    icon = 'Warning',
+    data = data,
+  })
+end
+
+---Send an error notification
+---@param dbal table
+---@param tenantId string
+---@param userId string
+---@param title string
+---@param message string
+---@param data table|nil
+function M.sendError(dbal, tenantId, userId, title, message, data)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    type = 'error',
+    title = title,
+    message = message,
+    icon = 'Error',
+    data = data,
+  })
+end
+
+---Send a mention notification
+---@param dbal table
+---@param tenantId string
+---@param userId string
+---@param mentionedBy string Username who mentioned
+---@param context string Where they were mentioned
+---@param link string|nil Link to the mention
+function M.sendMention(dbal, tenantId, userId, mentionedBy, context, link)
+  return M.create(dbal, {
+    tenantId = tenantId,
+    userId = userId,
+    type = 'mention',
+    title = 'You were mentioned',
+    message = mentionedBy .. ' mentioned you in ' .. context,
+    icon = 'AlternateEmail',
+    data = { mentionedBy = mentionedBy, link = link },
+  })
+end
+
+return M