CLI: Add command db.upgrade

This command is a shortcut for "alembic upgrade head".

README.md

@@ -125,6 +125,7 @@ available commands:
     import_ddb             Import registered devices from the DDB.
     import_file            Import registered devices from a local file.
     init                   Initialize the database.
+    upgrade                Upgrade database to the latest version.
 
   [gateway]
     run                    Run the aprs client.

ogn/commands/database.py

@@ -6,6 +6,8 @@ from ogn.collect.database import update_devices
 from manager import Manager
 manager = Manager()
 
+ALEMBIC_CONFIG_FILE = "alembic.ini"
+
 
 @manager.command
 def init():
@@ -15,11 +17,22 @@ def init():
     from alembic import command
 
     Base.metadata.create_all(engine)
-    alembic_cfg = Config("alembic.ini")
+    alembic_cfg = Config(ALEMBIC_CONFIG_FILE)
     command.stamp(alembic_cfg, "head")
     print("Done.")
 
 
+@manager.command
+def upgrade():
+    """Upgrade database to the latest version."""
+
+    from alembic.config import Config
+    from alembic import command
+
+    alembic_cfg = Config(ALEMBIC_CONFIG_FILE)
+    command.upgrade(alembic_cfg, 'head')
+
+
 @manager.command
 def drop(sure='n'):
     """Drop all tables."""