Actually *add* the database schema management utilities

In r397874, the scripts were removed... but not replaced. Thanks to
Michael Young for noticing this!
........

Merged revisions 397911 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@397912 65c4cc65-6c06-0410-ace0-fbb531ad65f3

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

@@ -0,0 +1,71 @@
+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = None
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    engine = engine_from_config(
+                config.get_section(config.config_ini_section),
+                prefix='sqlalchemy.',
+                poolclass=pool.NullPool)
+
+    connection = engine.connect()
+    context.configure(
+                connection=connection,
+                target_metadata=target_metadata
+                )
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
+

contrib/ast-db-manage/voicemail/script.py.mako

@@ -0,0 +1,22 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

contrib/ast-db-manage/voicemail/versions/a2e9769475e_create_tables.py

@@ -0,0 +1,58 @@
+#
+# Asterisk -- An open source telephony toolkit.
+#
+# Copyright (C) 2013, Russell Bryant
+#
+# Russell Bryant <russell@rusellbryant.net>
+#
+# See http://www.asterisk.org for more information about
+# the Asterisk project. Please do not directly contact
+# any of the maintainers of this project for assistance;
+# the project provides a web site, mailing lists and IRC
+# channels for your use.
+#
+# This program is free software, distributed under the terms of
+# the GNU General Public License Version 2. See the LICENSE file
+# at the top of the source tree.
+#
+
+"""Create tables
+
+Revision ID: a2e9769475e
+Revises: None
+Create Date: 2013-07-29 23:43:09.431668
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'a2e9769475e'
+down_revision = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'voicemail_messages',
+        sa.Column('dir', sa.String(255), nullable=False),
+        sa.Column('msgnum', sa.Integer, nullable=False),
+        sa.Column('context', sa.String(80)),
+        sa.Column('macrocontext', sa.String(80)),
+        sa.Column('callerid', sa.String(80)),
+        sa.Column('origtime', sa.Integer),
+        sa.Column('duration', sa.Integer),
+        sa.Column('recording', sa.LargeBinary),
+        sa.Column('flag', sa.String(30)),
+        sa.Column('category', sa.String(30)),
+        sa.Column('mailboxuser', sa.String(30)),
+        sa.Column('mailboxcontext', sa.String(30)),
+        sa.Column('msg_id', sa.String(40))
+    )
+    op.create_primary_key('voicemail_messages_dir_msgnum',
+            'voicemail_messages', ['dir', 'msgnum'])
+    op.create_index('voicemail_messages_dir', 'voicemail_messages', ['dir'])
+
+
+def downgrade():
+    op.drop_table('voicemail_messages')