i think you can use version control software e.g. mercurial, subversion, 
git, etc and configuration management software like puppet, ansible, chef, 
salt, etc. set separate environment for that, and then make sure it match 
with web2py appconfig.
e.g.
*models/db.py*
from gluon.contrib.appconfig import AppConfig
config_path = os.path.join(request.folder, 'private')
myconf = AppConfig('%s/appconfig.ini' % config_path, reload = True)
myconf_env = myconf.get('environment.type')
db = DAL(myconf.get(myconf_env + '_' + 'db.uri'), 
 pool_size = myconf.get(myconf_env + '_' + 'db.pool_size'), 
 migrate_enabled = myconf.get(myconf_env + '_' + 'db.migrate_enabled'), 
 check_reserved = ['all'], 
 lazy_tables = True)

*development environment*
private/appconfig.ini
[environment]
*type = dev*

[dev_db]
uri              = sqlite://test.sqlite
pool_size        = 10 ; ignored for sqlite
migrate_enabled  = true
migrate          = true
fake_migrate     = false
fake_migrate_all = false

[prod_db]
uri              = postgres://postgres:password@localhost/test
pool_size        = 10 ; ignored for sqlite
migrate_enabled  = false
migrate          = false
fake_migrate     = false
fake_migrate_all = false

*production environment*
private/appconfig.ini
[environment]
*type = prod*

[dev_db]
uri              = sqlite://test.sqlite
pool_size        = 10 ; ignored for sqlite
migrate_enabled  = true
migrate          = true
fake_migrate     = false
fake_migrate_all = false

[prod_db]
uri              = postgres://postgres:password@localhost/test
pool_size        = 10 ; ignored for sqlite
migrate_enabled  = false
migrate          = false
fake_migrate     = false
fake_migrate_all = false

best regards,
stifan

-- 
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