During database migration: DEPRECATION WARNING: #timestamps was called without specifying an option for null.

[oveits]

When I remove the database, and run the migration, I get deprecation warnings like follows:

DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140721173546_create_customers.rb:6)

Full log:

oveits:~/workspace (development) $ rm db/test.sqlite3
oveits:~/workspace (development) $ bundle exec rake db:migrate RAILS_ENV=test
== 20140721173546 CreateCustomers: migrating ==================================
-- create_table(:customers)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140721173546_create_customers.rb:6)
   -> 0.0049s
== 20140721173546 CreateCustomers: migrated (0.0051s) =========================

== 20140721173737 CreateSites: migrating ======================================
-- create_table(:sites)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140721173737_create_sites.rb:7)
   -> 0.0029s
== 20140721173737 CreateSites: migrated (0.0039s) =============================

== 20140728151630 CreateDelayedJobs: migrating ================================
-- create_table(:delayed_jobs, {:force=>true})
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in up at /home/ubuntu/workspace/db/migrate/20140728151630_create_delayed_jobs.rb:13)
   -> 0.0060s
-- add_index(:delayed_jobs, [:priority, :run_at], {:name=>"delayed_jobs_priority"})
   -> 0.0010s
== 20140728151630 CreateDelayedJobs: migrated (0.0080s) =======================

== 20140729164634 CreateProvisionings: migrating ==============================
-- create_table(:provisionings)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140729164634_create_provisionings.rb:6)
   -> 0.0029s
== 20140729164634 CreateProvisionings: migrated (0.0036s) =====================

== 20140802004343 AddProvisioningStatusToProvisioning: migrating ==============
-- add_column(:provisionings, :provisioning_status, :string)
   -> 0.0009s
== 20140802004343 AddProvisioningStatusToProvisioning: migrated (0.0061s) =====

== 20140802005009 RemoveProvisioningStatusToProvisioning: migrating ===========
-- remove_column(:provisionings, :provisioning_status, :string)
   -> 0.0645s
== 20140802005009 RemoveProvisioningStatusToProvisioning: migrated (0.0736s) ==

== 20140802005115 AddStatusToProvisioning: migrating ==========================
-- add_column(:provisionings, :status, :string)
   -> 0.0010s
== 20140802005115 AddStatusToProvisioning: migrated (0.0032s) =================

== 20140805122521 AddCustomerToProvisioning: migrating ========================
-- add_reference(:provisionings, :customer, {:index=>true})
   -> 0.0024s
== 20140805122521 AddCustomerToProvisioning: migrated (0.0142s) ===============

== 20140805131901 AddStatusToCustomer: migrating ==============================
-- add_column(:customers, :status, :string)
   -> 0.0009s
== 20140805131901 AddStatusToCustomer: migrated (0.0036s) =====================

== 20140805155557 AddSiteToProvisioning: migrating ============================
-- add_reference(:provisionings, :site, {:index=>true})
   -> 0.0028s
== 20140805155557 AddSiteToProvisioning: migrated (0.0104s) ===================

== 20140805160904 AddStatusToSite: migrating ==================================
-- add_column(:sites, :status, :string)
   -> 0.0010s
== 20140805160904 AddStatusToSite: migrated (0.0070s) =========================

== 20140805161451 AddCodeToSite: migrating ====================================
-- add_column(:sites, :code, :string)
   -> 0.0014s
== 20140805161451 AddCodeToSite: migrated (0.0098s) ===========================

== 20140805161609 AddCountryCodeToSite: migrating =============================
-- add_column(:sites, :countrycode, :string)
   -> 0.0011s
== 20140805161609 AddCountryCodeToSite: migrated (0.0031s) ====================

== 20140805161637 AddAreaCodeToSite: migrating ================================
-- add_column(:sites, :areacode, :string)
   -> 0.0009s
== 20140805161637 AddAreaCodeToSite: migrated (0.0107s) =======================

== 20140805161710 AddLocalOfficeCodeToSite: migrating =========================
-- add_column(:sites, :localofficecode, :string)
   -> 0.0015s
== 20140805161710 AddLocalOfficeCodeToSite: migrated (0.0041s) ================

== 20140805161753 AddExtensionLengthToSite: migrating =========================
-- add_column(:sites, :extensionlength, :string)
   -> 0.0011s
== 20140805161753 AddExtensionLengthToSite: migrated (0.0084s) ================

== 20140805161838 AddMainExtensionToSite: migrating ===========================
-- add_column(:sites, :mainextension, :string)
   -> 0.0010s
== 20140805161838 AddMainExtensionToSite: migrated (0.0030s) ==================

== 20140805164905 FixColumnName: migrating ====================================
-- rename_column(:sites, :code, :sitecode)
   -> 0.0234s
== 20140805164905 FixColumnName: migrated (0.0256s) ===========================

== 20140808124522 AddGatewayIpToSite: migrating ===============================
-- add_column(:sites, :gatewayIP, :string)
   -> 0.0012s
== 20140808124522 AddGatewayIpToSite: migrated (0.0082s) ======================

== 20140809094111 AddDelayedJobToProvisioning: migrating ======================
-- add_reference(:provisionings, :delayedjob, {:index=>true})
   -> 0.0031s
== 20140809094111 AddDelayedJobToProvisioning: migrated (0.0188s) =============

== 20140809110212 AddAttemptsToProvisioning: migrating ========================
-- add_column(:provisionings, :attempts, :integer)
   -> 0.0011s
== 20140809110212 AddAttemptsToProvisioning: migrated (0.0059s) ===============

== 20140817172734 CreateUsers: migrating ======================================
-- create_table(:users)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140817172734_create_users.rb:11)
   -> 0.0063s
== 20140817172734 CreateUsers: migrated (0.0139s) =============================

== 20140820060722 AddStatusToUser: migrating ==================================
-- add_column(:users, :status, :string)
   -> 0.0008s
== 20140820060722 AddStatusToUser: migrated (0.0026s) =========================

== 20140820061331 AddUserToProvisioning: migrating ============================
-- add_reference(:provisionings, :user, {:index=>true})
   -> 0.0036s
== 20140820061331 AddUserToProvisioning: migrated (0.0206s) ===================

== 20140821220517 CreateTargets: migrating ====================================
-- create_table(:targets)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20140821220517_create_targets.rb:7)
   -> 0.0104s
== 20140821220517 CreateTargets: migrated (0.0153s) ===========================

== 20140821221257 AddTargetToCustomer: migrating ==============================
-- add_reference(:customers, :target, {:index=>true})
   -> 0.0018s
== 20140821221257 AddTargetToCustomer: migrated (0.0073s) =====================

== 20141217211253 AddLanguageToCustomers: migrating ===========================
-- add_column(:customers, :language, :string)
   -> 0.0008s
== 20141217211253 AddLanguageToCustomers: migrated (0.0037s) ==================

== 20150406190851 AddStatusToTarget: migrating ================================
-- add_column(:targets, :status, :text)
   -> 0.0009s
== 20150406190851 AddStatusToTarget: migrated (0.0010s) =======================

== 20150429141009 AddProvisionigobjectColumnToProvisionings: migrating ========
-- change_table(:provisionings)
   -> 0.0015s
== 20150429141009 AddProvisionigobjectColumnToProvisionings: migrated (0.0030s) 

== 20150512170426 ChangeProvisioningsActionFromStringToText: migrating ========
-- change_column(:provisionings, :action, :text)
   -> 0.0272s
== 20150512170426 ChangeProvisioningsActionFromStringToText: migrated (0.0292s) 

== 20150607172131 CreateTextDocuments: migrating ==============================
-- create_table(:text_documents)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in change at /home/ubuntu/workspace/db/migrate/20150607172131_create_text_documents.rb:7)
   -> 0.0025s
== 20150607172131 CreateTextDocuments: migrated (0.0045s) =====================

== 20160130072858 AddJobIdToProvisionings: migrating ==========================
-- add_column(:provisionings, :job_id, :string)
   -> 0.0011s
== 20160130072858 AddJobIdToProvisionings: migrated (0.0021s) =================

== 20160201234653 DeviseCreateAdminUsers: migrating ===========================
-- create_table(:admin_users)
   -> 0.0015s
-- add_index(:admin_users, :email, {:unique=>true})
   -> 0.0016s
-- add_index(:admin_users, :reset_password_token, {:unique=>true})
   -> 0.0018s
== 20160201234653 DeviseCreateAdminUsers: migrated (0.0074s) ==================

== 20160201234705 CreateActiveAdminComments: migrating ========================
-- create_table(:active_admin_comments)
DEPRECATION WARNING: `#timestamps` was called without specifying an option for `null`. In Rails 5, this behavior will change to `null: false`. You should manually specify `null: true` to prevent the behavior of your existing migrations from changing. (called from block in up at /home/ubuntu/workspace/db/migrate/20160201234705_create_active_admin_comments.rb:9)
   -> 0.0024s
-- add_index(:active_admin_comments, [:namespace])
   -> 0.0008s
-- add_index(:active_admin_comments, [:author_type, :author_id])
   -> 0.0018s
-- add_index(:active_admin_comments, [:resource_type, :resource_id])
   -> 0.0020s
== 20160201234705 CreateActiveAdminComments: migrated (0.0106s) ===============

== 20160203173734 CreateConfigs: migrating ====================================
-- create_table(:configs)
   -> 0.0011s
== 20160203173734 CreateConfigs: migrated (0.0021s) ===========================

== 20160203181023 AddShortDescriptionToConfig: migrating ======================
-- add_column(:configs, :short_description, :string)
   -> 0.0011s
== 20160203181023 AddShortDescriptionToConfig: migrated (0.0029s) =============

== 20160203182054 AddDescriptionTextToConfig: migrating =======================
-- add_column(:configs, :description, :text)
   -> 0.0009s
== 20160203182054 AddDescriptionTextToConfig: migrated (0.0011s) ==============

== 20160203202010 AddDefaultValueToConfig: migrating ==========================
-- add_column(:configs, :default_value, :string)
   -> 0.0011s
== 20160203202010 AddDefaultValueToConfig: migrated (0.0018s) =================

== 20160205102214 CreateSystemSettings: migrating =============================
-- create_table(:system_settings)
   -> 0.0015s
== 20160205102214 CreateSystemSettings: migrated (0.0019s) ====================