alembic: Fix downgrade and tweak for sqlite

Downgrade had a few issues.  First there was an errant 'update' statement in
add_auto_dtmf_mode that looks like it was a copy/paste error.  Second, we
weren't cleaning up the ENUMs so subsequent upgrades on postgres failed
because the types already existed.

For sqlite...  sqlite doesn't support ALTER or DROP COLUMN directly.
Fortunately alembic batch_operations takes care of this for us if we
use it so the alter and drops were converted to use batch operations.

Here's an example downgrade:

    with op.batch_alter_table('ps_endpoints') as batch_op:
        batch_op.drop_column('tos_audio')
        batch_op.drop_column('tos_video')
        batch_op.add_column(sa.Column('tos_audio', yesno_values))
        batch_op.add_column(sa.Column('tos_video', yesno_values))
        batch_op.drop_column('cos_audio')
        batch_op.drop_column('cos_video')
        batch_op.add_column(sa.Column('cos_audio', yesno_values))
        batch_op.add_column(sa.Column('cos_video', yesno_values))

    with op.batch_alter_table('ps_transports') as batch_op:
        batch_op.drop_column('tos')
        batch_op.add_column(sa.Column('tos', yesno_values))
    # Can't cast integers to YESNO_VALUES, so dropping and adding is required
        batch_op.drop_column('cos')
        batch_op.add_column(sa.Column('cos', yesno_values))

Upgrades from base to head and downgrades from head to base were tested
repeatedly for postgresql, mysql/mariadb, and sqlite3.

Change-Id: I862b0739eb3fd45ec3412dcc13c2340e1b7baef8

contrib/ast-db-manage/config/env.py

@@ -58,7 +58,8 @@ def run_migrations_online():
     connection = engine.connect()
     context.configure(
                 connection=connection,
-                target_metadata=target_metadata
+                target_metadata=target_metadata,
+                render_as_batch=True
                 )
 
     try:

contrib/ast-db-manage/config/versions/10aedae86a32_add_outgoing_enum_va.py

@@ -45,7 +45,10 @@ def upgrade():
     context = op.get_context()
 
     # Upgrading to this revision WILL clear your directmedia values.
-    if context.bind.dialect.name != 'postgresql':
+    if context.bind.dialect.name == 'sqlite':
+        with op.batch_alter_table('sippeers') as batch_op:
+            batch_op.alter_column('directmedia', type_=new_type)
+    elif context.bind.dialect.name != 'postgresql':
         op.alter_column('sippeers', 'directmedia',
                         type_=new_type,
                         existing_type=old_type)
@@ -66,7 +69,10 @@ def downgrade():
     op.execute(tcr.update().where(tcr.c.directmedia==u'outgoing')
                .values(directmedia=None))
 
-    if context.bind.dialect.name != 'postgresql':
+    if context.bind.dialect.name == 'sqlite':
+        with op.batch_alter_table('sippeers') as batch_op:
+            batch_op.alter_column('directmedia', type_=old_type)
+    elif context.bind.dialect.name != 'postgresql':
         op.alter_column('sippeers', 'directmedia',
                         type_=old_type,
                         existing_type=new_type)

contrib/ast-db-manage/config/versions/136885b81223_add_regcontext_to_pj.py

@@ -17,4 +17,5 @@ def upgrade():
     op.add_column('ps_globals', sa.Column('regcontext', sa.String(80)))
 
 def downgrade():
-    op.drop_column('ps_globals', 'regcontext')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('regcontext')

contrib/ast-db-manage/config/versions/154177371065_add_default_from_user.py

@@ -19,4 +19,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_globals', 'default_from_user')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('default_from_user')

contrib/ast-db-manage/config/versions/15b1430ad6f1_add_moh_passthrough_option_to_pjsip.py

@@ -27,4 +27,5 @@ def upgrade():
     op.add_column('ps_endpoints', sa.Column('moh_passthrough', yesno_values))
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'moh_passthrough')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('moh_passthrough')

contrib/ast-db-manage/config/versions/1758e8bbf6b_increase_useragent_column_size.py

@@ -33,9 +33,11 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.alter_column('sippeers', 'useragent', type_=sa.String(255))
+    with op.batch_alter_table('sippeers') as batch_op:
+        batch_op.alter_column('useragent', type_=sa.String(255))
 
 
 def downgrade():
-    op.alter_column('sippeers', 'useragent', type_=sa.String(20))
+    with op.batch_alter_table('sippeers') as batch_op:
+        batch_op.alter_column('useragent', type_=sa.String(20))
 

contrib/ast-db-manage/config/versions/189a235b3fd7_add_keep_alive_interval.py

@@ -19,4 +19,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_globals', 'keep_alive_interval')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('keep_alive_interval')

contrib/ast-db-manage/config/versions/1d50859ed02e_create_accountcode.py

@@ -17,4 +17,5 @@ def upgrade():
     op.add_column('ps_endpoints', sa.Column('accountcode', sa.String(20)))
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'accountcode')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('accountcode')

contrib/ast-db-manage/config/versions/21e526ad3040_add_pjsip_debug_option.py

@@ -18,4 +18,5 @@ def upgrade():
     op.add_column('ps_globals', sa.Column('debug', sa.String(40)))
 
 def downgrade():
-    op.drop_column('ps_globals', 'debug')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('debug')

contrib/ast-db-manage/config/versions/23530d604b96_add_rpid_immediate.py

@@ -45,4 +45,5 @@ def upgrade():
     op.add_column('ps_endpoints', sa.Column('rpid_immediate', yesno_values))
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'rpid_immediate')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('rpid_immediate')

contrib/ast-db-manage/config/versions/26d7f3bf0fa5_add_bind_rtp_to_media_address_to_pjsip.py

@@ -28,4 +28,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'bind_rtp_to_media_address')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('bind_rtp_to_media_address')

contrib/ast-db-manage/config/versions/26f10cadc157_add_pjsip_timeout_options.py

@@ -20,5 +20,6 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'rtp_timeout')
-    op.drop_column('ps_endpoints', 'rtp_timeout_hold')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('rtp_timeout')
+        batch_op.drop_column('rtp_timeout_hold')

contrib/ast-db-manage/config/versions/28b8e71e541f_add_g726_non_standard.py

@@ -27,4 +27,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'g726_non_standard')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('g726_non_standard')

contrib/ast-db-manage/config/versions/28ce1e718f05_add_fatal_response_interval.py

@@ -19,4 +19,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_registrations', 'fatal_retry_interval')
+    with op.batch_alter_table('ps_registrations') as batch_op:
+        batch_op.drop_column('fatal_retry_interval')

contrib/ast-db-manage/config/versions/2d078ec071b7_increaes_contact_column_size.py

@@ -15,8 +15,10 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.alter_column('ps_aors', 'contact', type_=sa.String(255))
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.alter_column('contact', type_=sa.String(255))
 
 
 def downgrade():
-    op.alter_column('ps_aors', 'contact', type_=sa.String(40))
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.alter_column('contact', type_=sa.String(40))

contrib/ast-db-manage/config/versions/2fc7930b41b3_add_pjsip_endpoint_options_for_12_1.py

@@ -120,15 +120,15 @@ def upgrade():
     op.create_index('ps_registrations_id', 'ps_registrations', ['id'])
 
     ########################## add columns ###########################
-
+    with op.batch_alter_table('ps_endpoints') as batch_op:
     # new columns for endpoints
-    op.add_column('ps_endpoints', sa.Column('media_address', sa.String(40)))
-    op.add_column('ps_endpoints', sa.Column('redirect_method',
+        batch_op.add_column(sa.Column('media_address', sa.String(40)))
+        batch_op.add_column(sa.Column('redirect_method',
                                             pjsip_redirect_method_values))
-    op.add_column('ps_endpoints', sa.Column('set_var', sa.Text()))
+        batch_op.add_column(sa.Column('set_var', sa.Text()))
 
     # rename mwi_fromuser to mwi_from_user
-    op.alter_column('ps_endpoints', 'mwi_fromuser',
+        batch_op.alter_column('mwi_fromuser',
                     new_column_name='mwi_from_user',
                     existing_type=sa.String(40))
 
@@ -144,20 +144,23 @@ def upgrade():
 def downgrade():
     ########################## drop columns ##########################
 
-    op.drop_column('ps_aors', 'support_path')
-    op.drop_column('ps_aors', 'outbound_proxy')
-    op.drop_column('ps_aors', 'maximum_expiration')
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.drop_column('support_path')
+        batch_op.drop_column('outbound_proxy')
+        batch_op.drop_column('maximum_expiration')
 
-    op.drop_column('ps_contacts', 'path')
-    op.drop_column('ps_contacts', 'outbound_proxy')
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.drop_column('path')
+        batch_op.drop_column('outbound_proxy')
 
-    op.alter_column('ps_endpoints', 'mwi_from_user',
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.alter_column('mwi_from_user',
                     new_column_name='mwi_fromuser',
                     existing_type=sa.String(40))
 
-    op.drop_column('ps_endpoints', 'set_var')
-    op.drop_column('ps_endpoints', 'redirect_method')
-    op.drop_column('ps_endpoints', 'media_address')
+        batch_op.drop_column('set_var')
+        batch_op.drop_column('redirect_method')
+        batch_op.drop_column('media_address')
 
     ########################## drop tables ###########################
 

contrib/ast-db-manage/config/versions/31cd4f4891ec_add_auto_dtmf_mode.py

@@ -20,14 +20,14 @@ NEW_ENUM = ['rfc4733', 'inband', 'info', 'auto']
 old_type = sa.Enum(*OLD_ENUM, name='pjsip_dtmf_mode_values')
 new_type = sa.Enum(*NEW_ENUM, name='pjsip_dtmf_mode_values_v2')
 
-tcr = sa.sql.table('ps_endpoints', sa.Column('dtmf_mode', new_type,
-                   nullable=True))
-
 def upgrade():
     context = op.get_context()
 
     # Upgrading to this revision WILL clear your directmedia values.
-    if context.bind.dialect.name != 'postgresql':
+    if context.bind.dialect.name == 'sqlite':
+        with op.batch_alter_table('ps_endpoints') as batch_op:
+            batch_op.alter_column('dtmf_mode', type_=new_type)
+    elif context.bind.dialect.name != 'postgresql':
         op.alter_column('ps_endpoints', 'dtmf_mode',
                         type_=new_type,
                         existing_type=old_type)
@@ -45,10 +45,10 @@ def upgrade():
 def downgrade():
     context = op.get_context()
 
-    op.execute(tcr.update().where(tcr.c.directmedia==u'outgoing')
-               .values(directmedia=None))
-
-    if context.bind.dialect.name != 'postgresql':
+    if context.bind.dialect.name == 'sqlite':
+        with op.batch_alter_table('ps_endpoints') as batch_op:
+            batch_op.alter_column('dtmf_mode', type_=old_type)
+    elif context.bind.dialect.name != 'postgresql':
         op.alter_column('ps_endpoints', 'dtmf_mode',
                         type_=old_type,
                         existing_type=new_type)

contrib/ast-db-manage/config/versions/339a3bdf53fc_expand_accountcode_to_80.py

@@ -15,14 +15,20 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.alter_column('ps_endpoints', 'accountcode', type_=sa.String(80))
-    op.alter_column('sippeers', 'accountcode', type_=sa.String(80))
-    op.alter_column('iaxfriends', 'accountcode', type_=sa.String(80))
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(80))
+    with op.batch_alter_table('sippeers') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(80))
+    with op.batch_alter_table('iaxfriends') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(80))
     pass
 
 
 def downgrade():
-    op.alter_column('ps_endpoints', 'accountcode', type_=sa.String(20))
-    op.alter_column('sippeers', 'accountcode', type_=sa.String(40))
-    op.alter_column('iaxfriends', 'accountcode', type_=sa.String(20))
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(20))
+    with op.batch_alter_table('sippeers') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(40))
+    with op.batch_alter_table('iaxfriends') as batch_op:
+        batch_op.alter_column('accountcode', type_=sa.String(20))
     pass

contrib/ast-db-manage/config/versions/371a3bf4143e_add_user_eq_phone_option_to_pjsip.py

@@ -27,4 +27,5 @@ def upgrade():
     op.add_column('ps_endpoints', sa.Column('user_eq_phone', yesno_values))
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'user_eq_phone')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('user_eq_phone')

contrib/ast-db-manage/config/versions/3855ee4e5f85_add_missing_pjsip_options.py

@@ -20,5 +20,7 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_contacts', 'user_agent')
-    op.drop_column('ps_endpoints', 'message_context')
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.drop_column('user_agent')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('message_context')

contrib/ast-db-manage/config/versions/3bcc0b5bc2c9_add_allow_reload_to_ps_transports.py

@@ -20,8 +20,7 @@ YESNO_VALUES = ['yes', 'no']
 def upgrade():
     yesno_values = ENUM(*YESNO_VALUES, name=YESNO_NAME, create_type=False)
     op.add_column('ps_transports', sa.Column('allow_reload', yesno_values))
-    pass
 
 def downgrade():
-    op.drop_column('ps_transports', 'allow_reload')
-    pass
+    with op.batch_alter_table('ps_transports') as batch_op:
+        batch_op.drop_column('allow_reload')

contrib/ast-db-manage/config/versions/423f34ad36e2_fix_pjsip_qualify_ti.py

@@ -15,12 +15,13 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.alter_column('ps_aors', 'qualify_timeout', type_=sa.Float)
-    op.alter_column('ps_contacts', 'qualify_timeout', type_=sa.Float)
-    pass
-
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.alter_column('qualify_timeout', type_=sa.Float)
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.alter_column('qualify_timeout', type_=sa.Float)
 
 def downgrade():
-    op.alter_column('ps_aors', 'qualify_timeout', type_=sa.Integer)
-    op.alter_column('ps_contacts', 'qualify_timeout', type_=sa.Integer)
-    pass
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.alter_column('qualify_timeout', type_=sa.Integer)
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.alter_column('qualify_timeout', type_=sa.Integer)

contrib/ast-db-manage/config/versions/43956d550a44_add_tables_for_pjsip.py

@@ -12,6 +12,7 @@ down_revision = '4da0c5f79a9c'
 
 from alembic import op
 import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import ENUM
 
 
 YESNO_VALUES = ['yes', 'no']
@@ -181,9 +182,21 @@ def upgrade():
 
 
 def downgrade():
+    context = op.get_context()
+
     op.drop_table('ps_endpoints')
     op.drop_table('ps_auths')
     op.drop_table('ps_aors')
     op.drop_table('ps_contacts')
     op.drop_table('ps_domain_aliases')
     op.drop_table('ps_endpoint_id_ips')
+
+    enums = ['yesno_values',
+             'pjsip_100rel_values','pjsip_auth_type_values','pjsip_cid_privacy_values',
+             'pjsip_connected_line_method_values','pjsip_direct_media_glare_mitigation_values',
+             'pjsip_dtls_setup_values','pjsip_dtmf_mode_values','pjsip_identify_by_values',
+             'pjsip_media_encryption_values','pjsip_t38udptl_ec_values','pjsip_timer_values']
+
+    if context.bind.dialect.name == 'postgresql':
+        for e in enums:
+            ENUM(name=e).drop(op.get_bind(), checkfirst=False)

contrib/ast-db-manage/config/versions/45e3f47c6c44_add_pjsip_endpoint_identifier_order.py

@@ -18,4 +18,5 @@ def upgrade():
     op.add_column('ps_globals', sa.Column('endpoint_identifier_order', sa.String(40)))
 
 def downgrade():
-    op.drop_column('ps_globals', 'endpoint_identifier_order')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('endpoint_identifier_order')

contrib/ast-db-manage/config/versions/461d7d691209_add_pjsip_qualify_timeout.py

@@ -16,10 +16,9 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('ps_aors', sa.Column('qualify_timeout', sa.Integer))
     op.add_column('ps_contacts', sa.Column('qualify_timeout', sa.Integer))
-    pass
-
 
 def downgrade():
-    op.drop_column('ps_aors', 'qualify_timeout')
-    op.drop_column('ps_contacts', 'qualify_timeout')
-    pass
+    with op.batch_alter_table('ps_aors') as batch_op:
+        batch_op.drop_column('qualify_timeout')
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.drop_column('qualify_timeout')

contrib/ast-db-manage/config/versions/498357a710ae_add_rtp_keepalive.py

@@ -19,4 +19,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'rtp_keepalive')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('rtp_keepalive')

contrib/ast-db-manage/config/versions/4c573e7135bd_fix_tos_field_types.py

@@ -19,43 +19,43 @@ YESNO_NAME = 'yesno_values'
 YESNO_VALUES = ['yes', 'no']
 
 def upgrade():
-    op.alter_column('ps_endpoints', 'tos_audio',
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.alter_column('tos_audio',
                     type_=sa.String(10))
-    op.alter_column('ps_endpoints', 'tos_video',
+        batch_op.alter_column('tos_video',
                     type_=sa.String(10))
-    op.alter_column('ps_transports', 'tos',
+        batch_op.drop_column('cos_audio')
+        batch_op.drop_column('cos_video')
+        batch_op.add_column(sa.Column('cos_audio', sa.Integer))
+        batch_op.add_column(sa.Column('cos_video', sa.Integer))
+
+    with op.batch_alter_table('ps_transports') as batch_op:
+        batch_op.alter_column('tos',
                     type_=sa.String(10))
 
     # Can't cast YENO_VALUES to Integers, so dropping and adding is required
-    op.drop_column('ps_endpoints', 'cos_audio')
-    op.drop_column('ps_endpoints', 'cos_video')
-    op.drop_column('ps_transports', 'cos')
-
-    op.add_column('ps_endpoints', sa.Column('cos_audio', sa.Integer))
-    op.add_column('ps_endpoints', sa.Column('cos_video', sa.Integer))
-    op.add_column('ps_transports', sa.Column('cos', sa.Integer))
-    pass
+        batch_op.drop_column('cos')
 
+        batch_op.add_column(sa.Column('cos', sa.Integer))
 
 def downgrade():
 
     yesno_values = ENUM(*YESNO_VALUES, name=YESNO_NAME, create_type=False)
 
     # Can't cast string to YESNO_VALUES, so dropping and adding is required
-    op.drop_column('ps_endpoints', 'tos_audio')
-    op.drop_column('ps_endpoints', 'tos_video')
-    op.drop_column('ps_transports', 'tos')
-
-    op.add_column('ps_endpoints', sa.Column('tos_audio', yesno_values))
-    op.add_column('ps_endpoints', sa.Column('tos_video', yesno_values))
-    op.add_column('ps_transports', sa.Column('tos', yesno_values))
-
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('tos_audio')
+        batch_op.drop_column('tos_video')
+        batch_op.add_column(sa.Column('tos_audio', yesno_values))
+        batch_op.add_column(sa.Column('tos_video', yesno_values))
+        batch_op.drop_column('cos_audio')
+        batch_op.drop_column('cos_video')
+        batch_op.add_column(sa.Column('cos_audio', yesno_values))
+        batch_op.add_column(sa.Column('cos_video', yesno_values))
+
+    with op.batch_alter_table('ps_transports') as batch_op:
+        batch_op.drop_column('tos')
+        batch_op.add_column(sa.Column('tos', yesno_values))
     # Can't cast integers to YESNO_VALUES, so dropping and adding is required
-    op.drop_column('ps_endpoints', 'cos_audio')
-    op.drop_column('ps_endpoints', 'cos_video')
-    op.drop_column('ps_transports', 'cos')
-
-    op.add_column('ps_endpoints', sa.Column('cos_audio', yesno_values))
-    op.add_column('ps_endpoints', sa.Column('cos_video', yesno_values))
-    op.add_column('ps_transports', sa.Column('cos', yesno_values))
-    pass
+        batch_op.drop_column('cos')
+        batch_op.add_column(sa.Column('cos', yesno_values))

contrib/ast-db-manage/config/versions/4da0c5f79a9c_create_tables.py

@@ -30,7 +30,7 @@ down_revision = None
 
 from alembic import op
 import sqlalchemy as sa
-
+from sqlalchemy.dialects.postgresql import ENUM
 
 YESNO_VALUES = ['yes', 'no']
 TYPE_VALUES = ['friend', 'user', 'peer']
@@ -323,8 +323,20 @@ def upgrade():
 
 
 def downgrade():
+    context = op.get_context()
+
     op.drop_table('sippeers')
     op.drop_table('iaxfriends')
     op.drop_table('voicemail')
     op.drop_table('meetme')
     op.drop_table('musiconhold')
+
+    enums = ['type_values', 'yes_no_values',
+             'sip_transport_values','sip_dtmfmode_values','sip_directmedia_values',
+             'sip_progressinband_values','sip_session_timers_values','sip_session_refresher_values',
+             'sip_callingpres_values','iax_requirecalltoken_values','iax_encryption_values',
+             'iax_transfer_values','moh_mode_values']
+
+    if context.bind.dialect.name == 'postgresql':
+        for e in enums:
+            ENUM(name=e).drop(op.get_bind(), checkfirst=False)

contrib/ast-db-manage/config/versions/5139253c0423_make_q_member_uniqueid_autoinc.py

@@ -33,28 +33,31 @@ import sqlalchemy as sa
 
 
 def upgrade():
+    context = op.get_context()
     # Was unable to find a way to use op.alter_column() to add the unique
     # index property.
-    op.drop_column('queue_members', 'uniqueid')
-    op.add_column(
-        'queue_members',
-        sa.Column(
-            name='uniqueid', type_=sa.Integer, nullable=False,
-            unique=True))
+    if context.bind.dialect.name == 'sqlite':
+        with op.batch_alter_table('queue_members') as batch_op:
+            batch_op.create_primary_key('queue_members_pj', columns='uniqueid')
+    else:
+        op.drop_column('queue_members', 'uniqueid')
+        op.add_column(
+                      'queue_members',
+                      sa.Column(
+                                name='uniqueid', type_=sa.Integer, nullable=False,
+                                unique=True))
     # The postgres backend does not like the autoincrement needed for
     # mysql here.  It is just the backend that is giving a warning and
     # not the database itself.
-    op.alter_column(
-        table_name='queue_members', column_name='uniqueid',
-        existing_type=sa.Integer, existing_nullable=False,
-        autoincrement=True)
+        op.alter_column(
+                        table_name='queue_members', column_name='uniqueid',
+                        existing_type=sa.Integer, existing_nullable=False,
+                        autoincrement=True)
 
 
 def downgrade():
     # Was unable to find a way to use op.alter_column() to remove the
     # unique index property.
-    op.drop_column('queue_members', 'uniqueid')
-    op.add_column(
-        'queue_members',
-        sa.Column(name='uniqueid', type_=sa.String(80), nullable=False))
-
+    with op.batch_alter_table('queue_members') as batch_op:
+        batch_op.drop_column('uniqueid')
+        batch_op.add_column(sa.Column(name='uniqueid', type_=sa.String(80), nullable=False))

contrib/ast-db-manage/config/versions/51f8cb66540e_add_further_dtls_options.py

@@ -28,5 +28,6 @@ def upgrade():
     op.add_column('ps_endpoints', sa.Column('media_use_received_transport', yesno_values))
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'force_avp')
-    op.drop_column('ps_endpoints', 'media_use_received_transport')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('force_avp')
+        batch_op.drop_column('media_use_received_transport')

contrib/ast-db-manage/config/versions/5950038a6ead_fix_pjsip_verifiy_typo.py

@@ -19,11 +19,13 @@ YESNO_VALUES = ['yes', 'no']
 
 def upgrade():
     yesno_values = ENUM(*YESNO_VALUES, name=YESNO_NAME, create_type=False)
-    op.alter_column('ps_transports', 'verifiy_server', type_=yesno_values,
+    with op.batch_alter_table('ps_transports') as batch_op:
+        batch_op.alter_column('verifiy_server', type_=yesno_values,
                     new_column_name='verify_server')
 
 
 def downgrade():
     yesno_values = ENUM(*YESNO_VALUES, name=YESNO_NAME, create_type=False)
-    op.alter_column('ps_transports', 'verify_server', type_=yesno_values,
+    with op.batch_alter_table('ps_transports') as batch_op:
+        batch_op.alter_column('verify_server', type_=yesno_values,
                     new_column_name='verifiy_server')

contrib/ast-db-manage/config/versions/945b1098bdd_add_media_encryption_optimistic_to_pjsip.py

@@ -28,4 +28,5 @@ def upgrade():
 
 
 def downgrade():
-    op.drop_column('ps_endpoints', 'media_encryption_optimistic')
+    with op.batch_alter_table('ps_endpoints') as batch_op:
+        batch_op.drop_column('media_encryption_optimistic')

contrib/ast-db-manage/config/versions/a541e0b5e89_add_pjsip_max_initial_qualify_time.py

@@ -17,4 +17,5 @@ def upgrade():
     op.add_column('ps_globals', sa.Column('max_initial_qualify_time', sa.Integer))
 
 def downgrade():
-    op.drop_column('ps_globals', 'max_initial_qualify_time')
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.drop_column('max_initial_qualify_time')

contrib/ast-db-manage/config/versions/dbc44d5a908_add_missing_columns_to_sys_and_reg.py

@@ -27,11 +27,10 @@ def upgrade():
     op.add_column('ps_systems', sa.Column('disable_tcp_switch', yesno_values))
     op.add_column('ps_registrations', sa.Column('line', yesno_values))
     op.add_column('ps_registrations', sa.Column('endpoint', sa.String(40)))
-    pass
-
 
 def downgrade():
-    op.drop_column('ps_systems', 'disable_tcp_switch')
-    op.drop_column('ps_registrations', 'line')
-    op.drop_column('ps_registrations', 'endpoint')
-    pass
+    with op.batch_alter_table('ps_systems') as batch_op:
+        batch_op.drop_column('disable_tcp_switch')
+    with op.batch_alter_table('ps_registrations') as batch_op:
+        batch_op.drop_column('line')
+        batch_op.drop_column('endpoint')

contrib/ast-db-manage/config/versions/e96a0b8071c_increase_pjsip_column_size.py

@@ -15,25 +15,28 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.alter_column('ps_globals', 'user_agent', type_=sa.String(255))
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.alter_column('user_agent', type_=sa.String(255))
 
-    op.alter_column('ps_contacts', 'id', type_=sa.String(255))
-    op.alter_column('ps_contacts', 'uri', type_=sa.String(255))
-    op.alter_column('ps_contacts', 'user_agent', type_=sa.String(255))
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.alter_column('id', type_=sa.String(255))
+        batch_op.alter_column('uri', type_=sa.String(255))
+        batch_op.alter_column('user_agent', type_=sa.String(255))
 
-    op.alter_column('ps_registrations', 'client_uri', type_=sa.String(255))
-    op.alter_column('ps_registrations', 'server_uri', type_=sa.String(255))
+    with op.batch_alter_table('ps_registrations') as batch_op:
+        batch_op.alter_column('client_uri', type_=sa.String(255))
+        batch_op.alter_column('server_uri', type_=sa.String(255))
 
 
 def downgrade():
-    op.alter_column('ps_registrations', 'server_uri', type_=sa.String(40))
-    op.alter_column('ps_registrations', 'client_uri', type_=sa.String(40))
-
-    op.alter_column('ps_contacts', 'user_agent', type_=sa.String(40))
-    op.alter_column('ps_contacts', 'uri', type_=sa.String(40))
-    op.alter_column('ps_contacts', 'id', type_=sa.String(40))
-
-    op.alter_column('ps_globals', 'user_agent', type_=sa.String(40))
-
+    with op.batch_alter_table('ps_globals') as batch_op:
+        batch_op.alter_column('user_agent', type_=sa.String(40))
 
+    with op.batch_alter_table('ps_contacts') as batch_op:
+        batch_op.alter_column('id', type_=sa.String(40))
+        batch_op.alter_column('uri', type_=sa.String(40))
+        batch_op.alter_column('user_agent', type_=sa.String(40))
 
+    with op.batch_alter_table('ps_registrations') as batch_op:
+        batch_op.alter_column('client_uri', type_=sa.String(40))
+        batch_op.alter_column('server_uri', type_=sa.String(40))