diff --git a/addons/account_tax_python/__init__.py b/addons/account_tax_python/__init__.py
index 3b46f4dba2bd0..dc5e6b693d19d 100644
--- a/addons/account_tax_python/__init__.py
+++ b/addons/account_tax_python/__init__.py
@@ -2,16 +2,3 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import models
-
-from odoo import api, SUPERUSER_ID
-
-import logging
-_logger = logging.getLogger(__name__)
-
-def uninstall_hook(cr, registry):
-    env = api.Environment(cr, SUPERUSER_ID, {})
-
-    code_taxes = env['account.tax'].search([('amount_type', '=', 'code')])
-    code_taxes.write({'amount_type': 'percent', 'active': False})
-
-    _logger.warning("The following taxes have been archived following 'account_tax_python' module uninstallation: %s" % code_taxes.ids)
diff --git a/addons/account_tax_python/__manifest__.py b/addons/account_tax_python/__manifest__.py
index cb0dde674a565..e27facde6aa3e 100644
--- a/addons/account_tax_python/__manifest__.py
+++ b/addons/account_tax_python/__manifest__.py
@@ -17,5 +17,4 @@
     'data': [
         'views/account_tax_views.xml',
     ],
-    'uninstall_hook': "uninstall_hook",
 }
diff --git a/addons/account_tax_python/models/account_tax.py b/addons/account_tax_python/models/account_tax.py
index dbd143a58b5a3..435be47fa9cc0 100644
--- a/addons/account_tax_python/models/account_tax.py
+++ b/addons/account_tax_python/models/account_tax.py
@@ -8,7 +8,9 @@
 class AccountTaxPython(models.Model):
     _inherit = "account.tax"
 
-    amount_type = fields.Selection(selection_add=[('code', 'Python Code')])
+    amount_type = fields.Selection(selection_add=[
+        ('code', 'Python Code')
+    ], ondelete={'code': lambda recs: recs.write({'amount_type': 'percent', 'active': False})})
 
     python_compute = fields.Text(string='Python Code', default="result = price_unit * 0.10",
         help="Compute the amount of the tax by setting the variable 'result'.\n\n"
@@ -54,7 +56,9 @@ def compute_all(self, price_unit, currency=None, quantity=1.0, product=None, par
 class AccountTaxTemplatePython(models.Model):
     _inherit = 'account.tax.template'
 
-    amount_type = fields.Selection(selection_add=[('code', 'Python Code')])
+    amount_type = fields.Selection(selection_add=[
+        ('code', 'Python Code')
+    ], ondelete={'code': 'cascade'})
 
     python_compute = fields.Text(string='Python Code', default="result = price_unit * 0.10",
         help="Compute the amount of the tax by setting the variable 'result'.\n\n"
diff --git a/addons/base_automation/models/ir_actions.py b/addons/base_automation/models/ir_actions.py
index 67e75872873ab..0cf9263c637c5 100644
--- a/addons/base_automation/models/ir_actions.py
+++ b/addons/base_automation/models/ir_actions.py
@@ -7,4 +7,6 @@
 class ServerAction(models.Model):
     _inherit = "ir.actions.server"
 
-    usage = fields.Selection(selection_add=[('base_automation', 'Automated Action')])
+    usage = fields.Selection(selection_add=[
+        ('base_automation', 'Automated Action')
+    ], ondelete={'base_automation': 'cascade'})
diff --git a/addons/base_sparse_field/models/models.py b/addons/base_sparse_field/models/models.py
index cc886e808d8db..6947a2d120208 100644
--- a/addons/base_sparse_field/models/models.py
+++ b/addons/base_sparse_field/models/models.py
@@ -7,7 +7,9 @@
 class IrModelFields(models.Model):
     _inherit = 'ir.model.fields'
 
-    ttype = fields.Selection(selection_add=[('serialized', 'serialized')])
+    ttype = fields.Selection(selection_add=[
+        ('serialized', 'serialized'),
+    ], ondelete={'serialized': 'cascade'})
     serialization_field_id = fields.Many2one('ir.model.fields', string='Serialization Field',
         ondelete='cascade', domain="[('ttype','=','serialized'), ('model_id', '=', model_id)]",
         help="If set, this field will be stored in the sparse structure of the "
diff --git a/addons/calendar_sms/models/calendar.py b/addons/calendar_sms/models/calendar.py
index 1bfccfe7521df..815a93c86d00a 100644
--- a/addons/calendar_sms/models/calendar.py
+++ b/addons/calendar_sms/models/calendar.py
@@ -31,7 +31,9 @@ def _do_sms_reminder(self):
 class CalendarAlarm(models.Model):
     _inherit = 'calendar.alarm'
 
-    alarm_type = fields.Selection(selection_add=[('sms', 'SMS Text Message')])
+    alarm_type = fields.Selection(selection_add=[
+        ('sms', 'SMS Text Message')
+    ], ondelete={'sms': 'set default'})
 
 
 class AlarmManager(models.AbstractModel):
diff --git a/addons/crm/wizard/crm_lead_to_opportunity_mass.py b/addons/crm/wizard/crm_lead_to_opportunity_mass.py
index f33abf83ea9d3..2433c9e474eea 100644
--- a/addons/crm/wizard/crm_lead_to_opportunity_mass.py
+++ b/addons/crm/wizard/crm_lead_to_opportunity_mass.py
@@ -24,7 +24,9 @@ def default_get(self, fields):
     deduplicate = fields.Boolean('Apply deduplication', default=True, help='Merge with existing leads/opportunities of each partner')
     action = fields.Selection(selection_add=[
         ('each_exist_or_create', 'Use existing partner or create'),
-    ], string='Related Customer')
+    ], string='Related Customer', ondelete={
+        'each_exist_or_create': lambda recs: recs.write({'action': 'exist'}),
+    })
     force_assignment = fields.Boolean(default=False)
 
     @api.depends('duplicated_lead_ids')
diff --git a/addons/delivery/models/delivery_grid.py b/addons/delivery/models/delivery_grid.py
index bbfc0560a9cab..5cef40ac21024 100644
--- a/addons/delivery/models/delivery_grid.py
+++ b/addons/delivery/models/delivery_grid.py
@@ -38,7 +38,11 @@ def _compute_name(self):
 class ProviderGrid(models.Model):
     _inherit = 'delivery.carrier'
 
-    delivery_type = fields.Selection(selection_add=[('base_on_rule', 'Based on Rules')])
+    delivery_type = fields.Selection(selection_add=[
+        ('base_on_rule', 'Based on Rules'),
+        ], ondelete={'base_on_rule': lambda recs: recs.write({
+            'delivery_type': 'fixed', 'fixed_price': 0,
+        })})
     price_rule_ids = fields.One2many('delivery.price.rule', 'carrier_id', 'Pricing Rules', copy=True)
 
     def base_on_rule_rate_shipment(self, order):
diff --git a/addons/event_sms/models/event_mail.py b/addons/event_sms/models/event_mail.py
index 14d43ec137372..53562875f1022 100644
--- a/addons/event_sms/models/event_mail.py
+++ b/addons/event_sms/models/event_mail.py
@@ -7,7 +7,9 @@
 class EventTypeMail(models.Model):
     _inherit = 'event.type.mail'
 
-    notification_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    notification_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': 'set default'})
     sms_template_id = fields.Many2one(
         'sms.template', string='SMS Template',
         domain=[('model', '=', 'event.registration')], ondelete='restrict',
@@ -21,7 +23,9 @@ def _get_event_mail_fields_whitelist(self):
 class EventMailScheduler(models.Model):
     _inherit = 'event.mail'
 
-    notification_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    notification_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': 'set default'})
     sms_template_id = fields.Many2one(
         'sms.template', string='SMS Template',
         domain=[('model', '=', 'event.registration')], ondelete='restrict',
diff --git a/addons/hr/models/mail_alias.py b/addons/hr/models/mail_alias.py
index 6a363221943b4..3d652142f687f 100644
--- a/addons/hr/models/mail_alias.py
+++ b/addons/hr/models/mail_alias.py
@@ -7,7 +7,9 @@
 class Alias(models.Model):
     _inherit = 'mail.alias'
 
-    alias_contact = fields.Selection(selection_add=[('employees', 'Authenticated Employees')])
+    alias_contact = fields.Selection(selection_add=[
+        ('employees', 'Authenticated Employees'),
+    ], ondelete={'employees': 'cascade'})
 
     def _get_alias_bounced_body_fallback(self, message_dict):
         if self.alias_contact == 'employees':
diff --git a/addons/im_livechat_mail_bot/models/res_users.py b/addons/im_livechat_mail_bot/models/res_users.py
index ceea8848a5848..2803dddd98e9c 100644
--- a/addons/im_livechat_mail_bot/models/res_users.py
+++ b/addons/im_livechat_mail_bot/models/res_users.py
@@ -6,7 +6,6 @@
 
 class Users(models.Model):
     _inherit = 'res.users'
-    odoobot_state = fields.Selection(
-        selection_add=[
-            ('onboarding_canned', 'Onboarding canned'),
-        ])
+    odoobot_state = fields.Selection(selection_add=[
+        ('onboarding_canned', 'Onboarding canned'),
+    ], ondelete={'onboarding_canned': 'set default'})
diff --git a/addons/l10n_be_invoice_bba/models/account_journal.py b/addons/l10n_be_invoice_bba/models/account_journal.py
index e8cc09daf44a3..9ec4f408cbdbf 100644
--- a/addons/l10n_be_invoice_bba/models/account_journal.py
+++ b/addons/l10n_be_invoice_bba/models/account_journal.py
@@ -6,4 +6,6 @@
 class AccountJournal(models.Model):
     _inherit = 'account.journal'
 
-    invoice_reference_model = fields.Selection(selection_add=[('be', 'Belgium')])
+    invoice_reference_model = fields.Selection(selection_add=[
+        ('be', 'Belgium')
+        ], ondelete={'be': lambda recs: recs.write({'invoice_reference_model': 'odoo'})})
diff --git a/addons/l10n_ch/models/account_journal.py b/addons/l10n_ch/models/account_journal.py
index 9076a9f128d7b..f1bbb1bf5bba4 100644
--- a/addons/l10n_ch/models/account_journal.py
+++ b/addons/l10n_ch/models/account_journal.py
@@ -14,7 +14,9 @@ class AccountJournal(models.Model):
 
     # creation of bank journals by giving the account number, allow craetion of the
     l10n_ch_postal = fields.Char('Client Number', related='bank_account_id.l10n_ch_postal', readonly=False)
-    invoice_reference_model = fields.Selection(selection_add=[('ch', 'Switzerland')])
+    invoice_reference_model = fields.Selection(selection_add=[
+        ('ch', 'Switzerland')
+    ], ondelete={'ch': lambda recs: recs.write({'invoice_reference_model': 'odoo'})})
 
     @api.model
     def create(self, vals):
diff --git a/addons/l10n_no/models/account_journal.py b/addons/l10n_no/models/account_journal.py
index b030052781d17..fd75a635dd9aa 100644
--- a/addons/l10n_no/models/account_journal.py
+++ b/addons/l10n_no/models/account_journal.py
@@ -7,4 +7,6 @@
 class AccountJournal(models.Model):
     _inherit = 'account.journal'
 
-    invoice_reference_model = fields.Selection(selection_add=[('no', 'Norway')])
+    invoice_reference_model = fields.Selection(selection_add=[
+        ('no', 'Norway')
+    ], ondelete={'no': lambda recs: recs.write({'invoice_reference_model': 'odoo'})})
diff --git a/addons/mail/models/ir_action_act_window.py b/addons/mail/models/ir_action_act_window.py
index f08c404bf13a1..b95068cce4a33 100644
--- a/addons/mail/models/ir_action_act_window.py
+++ b/addons/mail/models/ir_action_act_window.py
@@ -5,4 +5,6 @@
 class ActWindowView(models.Model):
     _inherit = 'ir.actions.act_window.view'
 
-    view_mode = fields.Selection(selection_add=[('activity', 'Activity')])
+    view_mode = fields.Selection(selection_add=[
+        ('activity', 'Activity')
+    ], ondelete={'activity': 'cascade'})
diff --git a/addons/mail/models/ir_actions.py b/addons/mail/models/ir_actions.py
index a9ad3c6cd2dd7..5c27db9a08a38 100644
--- a/addons/mail/models/ir_actions.py
+++ b/addons/mail/models/ir_actions.py
@@ -17,7 +17,7 @@ class ServerActions(models.Model):
         ('email', 'Send Email'),
         ('followers', 'Add Followers'),
         ('next_activity', 'Create Next Activity'),
-    ])
+        ], ondelete={'email': 'cascade', 'followers': 'cascade', 'next_activity': 'cascade'})
     # Followers
     partner_ids = fields.Many2many('res.partner', string='Add Followers')
     channel_ids = fields.Many2many('mail.channel', string='Add Channels')
diff --git a/addons/mass_mailing_sms/models/mailing_mailing.py b/addons/mass_mailing_sms/models/mailing_mailing.py
index 4024b957b1328..b33456aa26656 100644
--- a/addons/mass_mailing_sms/models/mailing_mailing.py
+++ b/addons/mass_mailing_sms/models/mailing_mailing.py
@@ -21,7 +21,9 @@ def default_get(self, fields):
         return res
 
     # mailing options
-    mailing_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    mailing_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': 'set default'})
     # sms options
     body_plaintext = fields.Text('SMS Body', compute='_compute_body_plaintext', store=True, readonly=False)
     sms_template_id = fields.Many2one('sms.template', string='SMS Template', ondelete='set null')
diff --git a/addons/mass_mailing_sms/models/mailing_trace.py b/addons/mass_mailing_sms/models/mailing_trace.py
index f9d22f823e457..386ffb9bf4abe 100644
--- a/addons/mass_mailing_sms/models/mailing_trace.py
+++ b/addons/mass_mailing_sms/models/mailing_trace.py
@@ -14,7 +14,9 @@ class MailingTrace(models.Model):
     _inherit = 'mailing.trace'
     CODE_SIZE = 3
 
-    trace_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    trace_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': 'set default'})
     sms_sms_id = fields.Many2one('sms.sms', string='SMS', index=True, ondelete='set null')
     sms_sms_id_int = fields.Integer(
         string='SMS ID (tech)',
diff --git a/addons/mrp/models/stock_picking.py b/addons/mrp/models/stock_picking.py
index b3d2c1f671b1a..62f1d5f877d81 100644
--- a/addons/mrp/models/stock_picking.py
+++ b/addons/mrp/models/stock_picking.py
@@ -7,7 +7,9 @@
 class StockPickingType(models.Model):
     _inherit = 'stock.picking.type'
 
-    code = fields.Selection(selection_add=[('mrp_operation', 'Manufacturing')])
+    code = fields.Selection(selection_add=[
+        ('mrp_operation', 'Manufacturing')
+    ], ondelete={'mrp_operation': 'cascade'})
     count_mo_todo = fields.Integer(string="Number of Manufacturing Orders to Process",
         compute='_get_mo_count')
     count_mo_waiting = fields.Integer(string="Number of Manufacturing Orders Waiting",
diff --git a/addons/mrp/models/stock_rule.py b/addons/mrp/models/stock_rule.py
index c08e2ab2015db..132711287f099 100644
--- a/addons/mrp/models/stock_rule.py
+++ b/addons/mrp/models/stock_rule.py
@@ -11,7 +11,9 @@
 
 class StockRule(models.Model):
     _inherit = 'stock.rule'
-    action = fields.Selection(selection_add=[('manufacture', 'Manufacture')])
+    action = fields.Selection(selection_add=[
+        ('manufacture', 'Manufacture')
+    ], ondelete={'manufacture': 'cascade'})
 
     def _get_message_dict(self):
         message_dict = super(StockRule, self)._get_message_dict()
diff --git a/addons/mrp_landed_costs/models/stock_landed_cost.py b/addons/mrp_landed_costs/models/stock_landed_cost.py
index 3e193e39c3cf6..5d991f8c78825 100644
--- a/addons/mrp_landed_costs/models/stock_landed_cost.py
+++ b/addons/mrp_landed_costs/models/stock_landed_cost.py
@@ -7,7 +7,9 @@
 class StockLandedCost(models.Model):
     _inherit = 'stock.landed.cost'
 
-    target_model = fields.Selection(selection_add=[('manufacturing', "Manufacturing Orders")])
+    target_model = fields.Selection(selection_add=[
+        ('manufacturing', "Manufacturing Orders")
+    ], ondelete={'manufacturing': 'set default'})
     mrp_production_ids = fields.Many2many(
         'mrp.production', string='Manufacturing order',
         copy=False, states={'done': [('readonly', True)]}, groups='mrp.group_mrp_user')
diff --git a/addons/mrp_subcontracting/models/mrp_bom.py b/addons/mrp_subcontracting/models/mrp_bom.py
index e8ada6e16f526..00576ff52723c 100644
--- a/addons/mrp_subcontracting/models/mrp_bom.py
+++ b/addons/mrp_subcontracting/models/mrp_bom.py
@@ -7,7 +7,9 @@
 class MrpBom(models.Model):
     _inherit = 'mrp.bom'
 
-    type = fields.Selection(selection_add=[('subcontract', 'Subcontracting')])
+    type = fields.Selection(selection_add=[
+        ('subcontract', 'Subcontracting')
+    ], ondelete={'subcontract': lambda recs: recs.write({'type': 'normal', 'active': False})})
     subcontractor_ids = fields.Many2many('res.partner', 'mrp_bom_subcontractor', string='Subcontractors', check_company=True)
 
     def _bom_subcontract_find(self, product_tmpl=None, product=None, picking_type=None, company_id=False, bom_type='subcontract', subcontractor=False):
diff --git a/addons/payment_adyen/models/payment.py b/addons/payment_adyen/models/payment.py
index b1dce04c050ac..7a5388fab8980 100644
--- a/addons/payment_adyen/models/payment.py
+++ b/addons/payment_adyen/models/payment.py
@@ -47,7 +47,9 @@
 class AcquirerAdyen(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('adyen', 'Adyen')])
+    provider = fields.Selection(selection_add=[
+        ('adyen', 'Adyen')
+    ], ondelete={'adyen': 'set default'})
     adyen_merchant_account = fields.Char('Merchant Account', required_if_provider='adyen', groups='base.group_user')
     adyen_skin_code = fields.Char('Skin Code', required_if_provider='adyen', groups='base.group_user')
     adyen_skin_hmac_key = fields.Char('Skin HMAC Key', required_if_provider='adyen', groups='base.group_user')
diff --git a/addons/payment_alipay/models/payment.py b/addons/payment_alipay/models/payment.py
index e615fe9e36d41..4be338cf39754 100644
--- a/addons/payment_alipay/models/payment.py
+++ b/addons/payment_alipay/models/payment.py
@@ -17,7 +17,9 @@
 class PaymentAcquirer(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('alipay', 'Alipay')])
+    provider = fields.Selection(selection_add=[
+        ('alipay', 'Alipay')
+    ], ondelete={'alipay': 'set default'})
     alipay_payment_method = fields.Selection([
         ('express_checkout', 'Express Checkout (only for Chinese Merchant)'),
         ('standard_checkout', 'Cross-border'),
diff --git a/addons/payment_authorize/models/payment.py b/addons/payment_authorize/models/payment.py
index d6e08fda0e58e..3c89c36b5da22 100644
--- a/addons/payment_authorize/models/payment.py
+++ b/addons/payment_authorize/models/payment.py
@@ -19,7 +19,9 @@
 class PaymentAcquirerAuthorize(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('authorize', 'Authorize.Net')])
+    provider = fields.Selection(selection_add=[
+        ('authorize', 'Authorize.Net')
+    ], ondelete={'authorize': 'set default'})
     authorize_login = fields.Char(string='API Login Id', required_if_provider='authorize', groups='base.group_user')
     authorize_transaction_key = fields.Char(string='API Transaction Key', required_if_provider='authorize', groups='base.group_user')
     authorize_signature_key = fields.Char(string='API Signature Key', required_if_provider='authorize', groups='base.group_user')
diff --git a/addons/payment_buckaroo/models/payment.py b/addons/payment_buckaroo/models/payment.py
index 67ceb82a451a2..8689cf5f2ba5b 100644
--- a/addons/payment_buckaroo/models/payment.py
+++ b/addons/payment_buckaroo/models/payment.py
@@ -26,7 +26,9 @@ def normalize_keys_upper(data):
 class AcquirerBuckaroo(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('buckaroo', 'Buckaroo')])
+    provider = fields.Selection(selection_add=[
+        ('buckaroo', 'Buckaroo')
+    ], ondelete={'buckaroo': 'set default'})
     brq_websitekey = fields.Char('WebsiteKey', required_if_provider='buckaroo', groups='base.group_user')
     brq_secretkey = fields.Char('SecretKey', required_if_provider='buckaroo', groups='base.group_user')
 
diff --git a/addons/payment_ingenico/models/payment.py b/addons/payment_ingenico/models/payment.py
index 2e719ce033c0c..6076088aec1ad 100644
--- a/addons/payment_ingenico/models/payment.py
+++ b/addons/payment_ingenico/models/payment.py
@@ -25,7 +25,9 @@
 class PaymentAcquirerOgone(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('ogone', 'Ingenico')])
+    provider = fields.Selection(selection_add=[
+        ('ogone', 'Ingenico')
+    ], ondelete={'ogone': 'set default'})
     ogone_pspid = fields.Char('PSPID', required_if_provider='ogone', groups='base.group_user')
     ogone_userid = fields.Char('API User ID', required_if_provider='ogone', groups='base.group_user')
     ogone_password = fields.Char('API User Password', required_if_provider='ogone', groups='base.group_user')
diff --git a/addons/payment_paypal/models/payment.py b/addons/payment_paypal/models/payment.py
index f3b99925c8517..d947c3a8c92a2 100644
--- a/addons/payment_paypal/models/payment.py
+++ b/addons/payment_paypal/models/payment.py
@@ -19,7 +19,9 @@
 class AcquirerPaypal(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('paypal', 'Paypal')])
+    provider = fields.Selection(selection_add=[
+        ('paypal', 'Paypal')
+    ], ondelete={'paypal': 'set default'})
     paypal_email_account = fields.Char('Email', required_if_provider='paypal', groups='base.group_user')
     paypal_seller_account = fields.Char(
         'Merchant Account ID', groups='base.group_user',
diff --git a/addons/payment_payulatam/models/payment.py b/addons/payment_payulatam/models/payment.py
index db063f2ce5dd4..958a977ee1b30 100644
--- a/addons/payment_payulatam/models/payment.py
+++ b/addons/payment_payulatam/models/payment.py
@@ -18,7 +18,9 @@
 class PaymentAcquirerPayulatam(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('payulatam', 'PayU Latam')])
+    provider = fields.Selection(selection_add=[
+        ('payulatam', 'PayU Latam')
+    ], ondelete={'payulatam': 'set default'})
     payulatam_merchant_id = fields.Char(string="PayU Latam Merchant ID", required_if_provider='payulatam', groups='base.group_user')
     payulatam_account_id = fields.Char(string="PayU Latam Account ID", required_if_provider='payulatam', groups='base.group_user')
     payulatam_api_key = fields.Char(string="PayU Latam API Key", required_if_provider='payulatam', groups='base.group_user')
diff --git a/addons/payment_payumoney/models/payment.py b/addons/payment_payumoney/models/payment.py
index 5fafad61657ac..39bbc23dbd265 100644
--- a/addons/payment_payumoney/models/payment.py
+++ b/addons/payment_payumoney/models/payment.py
@@ -17,7 +17,9 @@
 class PaymentAcquirerPayumoney(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('payumoney', 'PayUmoney')])
+    provider = fields.Selection(selection_add=[
+        ('payumoney', 'PayUmoney')
+    ], ondelete={'payumoney': 'set default'})
     payumoney_merchant_key = fields.Char(string='Merchant Key', required_if_provider='payumoney', groups='base.group_user')
     payumoney_merchant_salt = fields.Char(string='Merchant Salt', required_if_provider='payumoney', groups='base.group_user')
 
diff --git a/addons/payment_sips/models/payment.py b/addons/payment_sips/models/payment.py
index fafea220e7553..ff651a78362f8 100644
--- a/addons/payment_sips/models/payment.py
+++ b/addons/payment_sips/models/payment.py
@@ -43,7 +43,9 @@
 class AcquirerSips(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('sips', 'Sips')])
+    provider = fields.Selection(selection_add=[
+        ('sips', 'Sips')
+    ], ondelete={'sips': 'set default'})
     sips_merchant_id = fields.Char('Merchant ID', help="Used for production only", required_if_provider='sips', groups='base.group_user')
     sips_secret = fields.Char('Secret Key', size=64, required_if_provider='sips', groups='base.group_user')
     sips_test_url = fields.Char("Test url", required_if_provider='sips', default='https://payment-webinit.simu.sips-atos.com/paymentInit')
diff --git a/addons/payment_stripe/models/payment.py b/addons/payment_stripe/models/payment.py
index 54441a1a47533..81b553587dd97 100644
--- a/addons/payment_stripe/models/payment.py
+++ b/addons/payment_stripe/models/payment.py
@@ -24,7 +24,9 @@
 class PaymentAcquirerStripe(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('stripe', 'Stripe')])
+    provider = fields.Selection(selection_add=[
+        ('stripe', 'Stripe')
+    ], ondelete={'stripe': 'set default'})
     stripe_secret_key = fields.Char(required_if_provider='stripe', groups='base.group_user')
     stripe_publishable_key = fields.Char(required_if_provider='stripe', groups='base.group_user')
     stripe_image_url = fields.Char(
diff --git a/addons/payment_test/models/payment_acquirer.py b/addons/payment_test/models/payment_acquirer.py
index 7d816f4f555cb..c569c7a1f072a 100644
--- a/addons/payment_test/models/payment_acquirer.py
+++ b/addons/payment_test/models/payment_acquirer.py
@@ -10,7 +10,9 @@
 class PaymentAcquirerTest(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('test', 'Test')])
+    provider = fields.Selection(selection_add=[
+        ('test', 'Test')
+    ], ondelete={'test': 'set default'})
 
     @api.model
     def create(self, values):
diff --git a/addons/payment_transfer/models/payment.py b/addons/payment_transfer/models/payment.py
index 4f51f2cf1173f..b748fa503494c 100644
--- a/addons/payment_transfer/models/payment.py
+++ b/addons/payment_transfer/models/payment.py
@@ -13,7 +13,9 @@
 class TransferPaymentAcquirer(models.Model):
     _inherit = 'payment.acquirer'
 
-    provider = fields.Selection(selection_add=[('transfer', 'Manual Payment')], default='transfer')
+    provider = fields.Selection(selection_add=[
+        ('transfer', 'Manual Payment')
+    ], default='transfer', ondelete={'transfer': 'set default'})
 
     @api.model
     def _create_missing_journal_for_acquirers(self, company=None):
diff --git a/addons/point_of_sale/models/barcode_rule.py b/addons/point_of_sale/models/barcode_rule.py
index 5e50598300657..e9b67a515823e 100644
--- a/addons/point_of_sale/models/barcode_rule.py
+++ b/addons/point_of_sale/models/barcode_rule.py
@@ -9,9 +9,15 @@ class BarcodeRule(models.Model):
     _inherit = 'barcode.rule'
 
     type = fields.Selection(selection_add=[
-            ('weight', 'Weighted Product'),
-            ('price', 'Priced Product'),
-            ('discount', 'Discounted Product'),
-            ('client', 'Client'),
-            ('cashier', 'Cashier')
-        ])
+        ('weight', 'Weighted Product'),
+        ('price', 'Priced Product'),
+        ('discount', 'Discounted Product'),
+        ('client', 'Client'),
+        ('cashier', 'Cashier')
+    ], ondelete={
+        'weight': 'set default',
+        'price': 'set default',
+        'discount': 'set default',
+        'client': 'set default',
+        'cashier': 'set default',
+    })
diff --git a/addons/pos_mercury/models/pos_mercury.py b/addons/pos_mercury/models/pos_mercury.py
index cfac776876ceb..a95dba493d6eb 100644
--- a/addons/pos_mercury/models/pos_mercury.py
+++ b/addons/pos_mercury/models/pos_mercury.py
@@ -14,7 +14,7 @@ class BarcodeRule(models.Model):
 
     type = fields.Selection(selection_add=[
         ('credit', 'Credit Card')
-    ])
+    ], ondelete={'credit': 'set default'})
 
 
 class PosMercuryConfiguration(models.Model):
diff --git a/addons/purchase_stock/models/stock_rule.py b/addons/purchase_stock/models/stock_rule.py
index a102726dece12..2fbabfe79ca88 100644
--- a/addons/purchase_stock/models/stock_rule.py
+++ b/addons/purchase_stock/models/stock_rule.py
@@ -13,7 +13,9 @@
 class StockRule(models.Model):
     _inherit = 'stock.rule'
 
-    action = fields.Selection(selection_add=[('buy', 'Buy')])
+    action = fields.Selection(selection_add=[
+        ('buy', 'Buy')
+    ], ondelete={'buy': 'cascade'})
 
     def _get_message_dict(self):
         message_dict = super(StockRule, self)._get_message_dict()
diff --git a/addons/sale_coupon_delivery/__init__.py b/addons/sale_coupon_delivery/__init__.py
index 03e0428dae587..be9f4fab00ae2 100644
--- a/addons/sale_coupon_delivery/__init__.py
+++ b/addons/sale_coupon_delivery/__init__.py
@@ -1,12 +1,3 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
-from odoo import api, SUPERUSER_ID
-
 from . import models
-
-
-def uninstall_hook(cr, registry):
-    env = api.Environment(cr, SUPERUSER_ID, {})
-    env['delivery.carrier'].search([
-        ('delivery_type', '=', 'temando')
-    ]).write({'delivery_type': 'fixed', 'fixed_price': 0})
diff --git a/addons/sale_timesheet/__init__.py b/addons/sale_timesheet/__init__.py
index 154c2b71150ab..7d7e07d0b8c53 100644
--- a/addons/sale_timesheet/__init__.py
+++ b/addons/sale_timesheet/__init__.py
@@ -1,18 +1,6 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
-
-from odoo import api, SUPERUSER_ID
-
 from . import controllers
 from . import models
 from . import wizard
 from . import report
-
-def uninstall_hook(cr, registry):
-    env = api.Environment(cr, SUPERUSER_ID, {})
-    env['product.template'].search([
-        ('service_type', '=', 'timesheet')
-    ]).write({'service_type': 'manual'})
-    env['product.product'].search([
-        ('service_type', '=', 'timesheet')
-    ]).write({'service_type': 'manual'})
diff --git a/addons/sale_timesheet/__manifest__.py b/addons/sale_timesheet/__manifest__.py
index 63c503ec8c72d..55ca50305e5d4 100644
--- a/addons/sale_timesheet/__manifest__.py
+++ b/addons/sale_timesheet/__manifest__.py
@@ -37,5 +37,4 @@
         'data/sale_service_demo.xml',
     ],
     'auto_install': True,
-    'uninstall_hook': 'uninstall_hook',
 }
diff --git a/addons/sale_timesheet/models/product.py b/addons/sale_timesheet/models/product.py
index d1a4d83d307b8..3ae044c7c91bf 100644
--- a/addons/sale_timesheet/models/product.py
+++ b/addons/sale_timesheet/models/product.py
@@ -14,7 +14,7 @@ class ProductTemplate(models.Model):
     ], string="Service Invoicing Policy", compute='_compute_service_policy', inverse='_inverse_service_policy')
     service_type = fields.Selection(selection_add=[
         ('timesheet', 'Timesheets on project (one fare per SO/Project)'),
-    ])
+    ], ondelete={'timesheet': 'set default'})
     # override domain
     project_id = fields.Many2one(domain="[('billable_type', '=', 'no'), ('allow_timesheets', 'in', [service_policy == 'delivered_timesheet' or '', True])]")
     project_template_id = fields.Many2one(domain="[('billable_type', '=', 'no'), ('allow_timesheets', 'in', [service_policy == 'delivered_timesheet' or '', True])]")
diff --git a/addons/sms/models/ir_actions.py b/addons/sms/models/ir_actions.py
index 85869761e5742..e5421d4546cf1 100644
--- a/addons/sms/models/ir_actions.py
+++ b/addons/sms/models/ir_actions.py
@@ -12,7 +12,7 @@ class ServerActions(models.Model):
 
     state = fields.Selection(selection_add=[
         ('sms', 'Send SMS Text Message'),
-    ])
+    ], ondelete={'sms': 'cascade'})
     # SMS
     sms_template_id = fields.Many2one(
         'sms.template', 'SMS Template', ondelete='set null',
diff --git a/addons/sms/models/mail_message.py b/addons/sms/models/mail_message.py
index 10e9ffab73ba8..dbc0a78cd7545 100644
--- a/addons/sms/models/mail_message.py
+++ b/addons/sms/models/mail_message.py
@@ -14,7 +14,9 @@ class MailMessage(models.Model):
     gateway. """
     _inherit = 'mail.message'
 
-    message_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    message_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': lambda recs: recs.write({'message_type': 'email'})})
     has_sms_error = fields.Boolean(
         'Has SMS error', compute='_compute_has_sms_error', search='_search_has_sms_error',
         help='Has error')
diff --git a/addons/sms/models/mail_notification.py b/addons/sms/models/mail_notification.py
index c45981ea0b08f..3e00399fcc3dd 100644
--- a/addons/sms/models/mail_notification.py
+++ b/addons/sms/models/mail_notification.py
@@ -7,7 +7,9 @@
 class Notification(models.Model):
     _inherit = 'mail.notification'
 
-    notification_type = fields.Selection(selection_add=[('sms', 'SMS')])
+    notification_type = fields.Selection(selection_add=[
+        ('sms', 'SMS')
+    ], ondelete={'sms': 'set default'})
     sms_id = fields.Many2one('sms.sms', string='SMS', index=True, ondelete='set null')
     sms_number = fields.Char('SMS Number')
     failure_type = fields.Selection(selection_add=[
diff --git a/addons/snailmail/models/mail_message.py b/addons/snailmail/models/mail_message.py
index 38364f75590ac..94284fd99a790 100644
--- a/addons/snailmail/models/mail_message.py
+++ b/addons/snailmail/models/mail_message.py
@@ -7,7 +7,9 @@ class Message(models.Model):
     snailmail_error = fields.Boolean("Snailmail message in error", compute="_compute_snailmail_error", search="_search_snailmail_error")
     snailmail_status = fields.Char("Snailmail Status", compute="_compute_snailmail_error")
     letter_ids = fields.One2many(comodel_name='snailmail.letter', inverse_name='message_id')
-    message_type = fields.Selection(selection_add=[('snailmail', 'Snailmail')])
+    message_type = fields.Selection(selection_add=[
+        ('snailmail', 'Snailmail')
+    ], ondelete={'snailmail': lambda recs: recs.write({'message_type': 'email'})})
 
     def _get_message_format_fields(self):
         res = super(Message, self)._get_message_format_fields()
diff --git a/addons/stock/__init__.py b/addons/stock/__init__.py
index 9d7a09cb88c3f..f912d4ed8fa50 100644
--- a/addons/stock/__init__.py
+++ b/addons/stock/__init__.py
@@ -28,12 +28,3 @@ def _assign_default_mail_template_picking_id(cr, registry):
         company_ids_without_default_mail_template_id.write({
             'stock_mail_confirmation_template_id': default_mail_template_id.id,
         })
-
-
-def uninstall_hook(cr, registry):
-    env = api.Environment(cr, SUPERUSER_ID, {})
-    default = env['product.template']._fields['type'].default(env['product.template'])
-    # stock introduces an option on the `type` Selection field of `product.template`
-    # if this module is uninstalled and any `product.template` record still points to this option
-    # the registry will find itself in an unstable state and will most likely crash (eventually)
-    cr.execute("UPDATE product_template SET type = %s WHERE type = %s", (default, 'product'))
diff --git a/addons/stock/__manifest__.py b/addons/stock/__manifest__.py
index 5513c5e791133..9b17dd03f5192 100644
--- a/addons/stock/__manifest__.py
+++ b/addons/stock/__manifest__.py
@@ -88,5 +88,4 @@
     'auto_install': False,
     'pre_init_hook': 'pre_init_hook',
     'post_init_hook': '_assign_default_mail_template_picking_id',
-    'uninstall_hook': 'uninstall_hook',
 }
diff --git a/addons/stock/models/barcode.py b/addons/stock/models/barcode.py
index 61b8a31dbc08b..e81afcfe60799 100644
--- a/addons/stock/models/barcode.py
+++ b/addons/stock/models/barcode.py
@@ -8,8 +8,13 @@ class BarcodeRule(models.Model):
     _inherit = 'barcode.rule'
 
     type = fields.Selection(selection_add=[
-            ('weight', 'Weighted Product'),
-            ('location', 'Location'),
-            ('lot', 'Lot'),
-            ('package', 'Package')
-        ])
+        ('weight', 'Weighted Product'),
+        ('location', 'Location'),
+        ('lot', 'Lot'),
+        ('package', 'Package')
+    ], ondelete={
+        'weight': 'set default',
+        'location': 'set default',
+        'lot': 'set default',
+        'package': 'set default',
+    })
diff --git a/addons/stock/models/product.py b/addons/stock/models/product.py
index 79173dbe6b268..4158b86d84ad6 100644
--- a/addons/stock/models/product.py
+++ b/addons/stock/models/product.py
@@ -537,7 +537,9 @@ class ProductTemplate(models.Model):
     responsible_id = fields.Many2one(
         'res.users', string='Responsible', default=lambda self: self.env.uid, company_dependent=True, check_company=True,
         help="This user will be responsible of the next activities related to logistic operations for this product.")
-    type = fields.Selection(selection_add=[('product', 'Storable Product')], tracking=True)
+    type = fields.Selection(selection_add=[
+        ('product', 'Storable Product')
+    ], tracking=True, ondelete={'product': 'set default'})
     property_stock_production = fields.Many2one(
         'stock.location', "Production Location",
         company_dependent=True, check_company=True, domain="[('usage', '=', 'production'), '|', ('company_id', '=', False), ('company_id', '=', allowed_company_ids[0])]",
diff --git a/addons/survey/models/challenge.py b/addons/survey/models/challenge.py
index b4cd4626b911c..23b54c16ce700 100644
--- a/addons/survey/models/challenge.py
+++ b/addons/survey/models/challenge.py
@@ -7,4 +7,6 @@
 class Challenge(models.Model):
     _inherit = 'gamification.challenge'
 
-    challenge_category = fields.Selection(selection_add=[('certification', 'Certifications')])
+    challenge_category = fields.Selection(selection_add=[
+        ('certification', 'Certifications')
+    ], ondelete={'certification': 'set default'})
diff --git a/addons/web/models/models.py b/addons/web/models/models.py
index 7f6e83554e327..bb9a865f16179 100644
--- a/addons/web/models/models.py
+++ b/addons/web/models/models.py
@@ -14,7 +14,9 @@
 class IrActionsActWindowView(models.Model):
     _inherit = 'ir.actions.act_window.view'
 
-    view_mode = fields.Selection(selection_add=[('qweb', 'QWeb')])
+    view_mode = fields.Selection(selection_add=[
+        ('qweb', 'QWeb')
+    ], ondelete={'qweb': 'cascade'})
 
 
 class Base(models.AbstractModel):
diff --git a/addons/website_forum/models/gamification.py b/addons/website_forum/models/gamification.py
index 902b5e0eab9b1..1f7d758ea3eda 100644
--- a/addons/website_forum/models/gamification.py
+++ b/addons/website_forum/models/gamification.py
@@ -7,4 +7,6 @@
 class Challenge(models.Model):
     _inherit = 'gamification.challenge'
 
-    challenge_category = fields.Selection(selection_add=[('forum', 'Website / Forum')])
+    challenge_category = fields.Selection(selection_add=[
+        ('forum', 'Website / Forum')
+    ], ondelete={'forum': 'set default'})
diff --git a/addons/website_sale_slides/models/slide_channel.py b/addons/website_sale_slides/models/slide_channel.py
index bb95e2e0ab564..ee288fb8b64e3 100644
--- a/addons/website_sale_slides/models/slide_channel.py
+++ b/addons/website_sale_slides/models/slide_channel.py
@@ -7,7 +7,9 @@
 class Channel(models.Model):
     _inherit = 'slide.channel'
 
-    enroll = fields.Selection(selection_add=[('payment', 'On payment')])
+    enroll = fields.Selection(selection_add=[
+        ('payment', 'On payment')
+    ], ondelete={'payment': lambda recs: recs.write({'enroll': 'invite'})})
     product_id = fields.Many2one('product.product', 'Product', index=True)
     product_sale_revenues = fields.Monetary(
         string='Total revenues', compute='_compute_product_sale_revenues',
diff --git a/addons/website_slides/models/gamification_challenge.py b/addons/website_slides/models/gamification_challenge.py
index f1346f7ddabb5..7bb7f498ec433 100644
--- a/addons/website_slides/models/gamification_challenge.py
+++ b/addons/website_slides/models/gamification_challenge.py
@@ -7,4 +7,6 @@
 class Challenge(models.Model):
     _inherit = 'gamification.challenge'
 
-    challenge_category = fields.Selection(selection_add=[('slides', 'Website / Slides')])
+    challenge_category = fields.Selection(selection_add=[
+        ('slides', 'Website / Slides')
+    ], ondelete={'slides': 'set default'})
diff --git a/addons/website_slides_survey/models/slide_slide.py b/addons/website_slides_survey/models/slide_slide.py
index 26b79394c5850..76e1453eb7a80 100644
--- a/addons/website_slides_survey/models/slide_slide.py
+++ b/addons/website_slides_survey/models/slide_slide.py
@@ -38,7 +38,9 @@ def _write(self, vals):
 class Slide(models.Model):
     _inherit = 'slide.slide'
 
-    slide_type = fields.Selection(selection_add=[('certification', 'Certification')])
+    slide_type = fields.Selection(selection_add=[
+        ('certification', 'Certification')
+    ], ondelete={'certification': 'set default'})
     survey_id = fields.Many2one('survey.survey', 'Certification')
     nbr_certification = fields.Integer("Number of Certifications", compute='_compute_slides_statistics', store=True)