diff --git a/app/models.py b/app/models.py
index efbcda5..7509dfd 100644
--- a/app/models.py
+++ b/app/models.py
@@ -2,23 +2,53 @@ from app import app, db
 from sqlalchemy.sql import func
 
 game_player = db.Table('game_player',
-        db.Column('game_id', db.Integer, db.ForeignKey('game.id')),
-        db.Column('player_id', db.Integer, db.ForeignKey('player.id')),
+        db.Column('game_id', db.Integer, db.ForeignKey('game.id'), nullable=False),
+        db.Column('player_id', db.Integer, db.ForeignKey('player.id'), nullable=False),
+        db.PrimaryKeyConstraint('game_id', 'player_id'),
         db.Column('role', db.String(16))
         )
 
+player_found_objective = db.Table('player_found_objective',
+        db.Column('game_id', db.Integer, db.ForeignKey('game.id'), nullable=False),
+        db.Column('player_id', db.Integer, db.ForeignKey('player.id'), nullable=False),
+        db.PrimaryKeyConstraint('game_id', 'player_id'),
+        db.Column('timestamp', db.DateTime, server_default=func.now(), nullable=False)
+        )
+
+player_caught_player = db.Table('player_caught_player',
+        db.Column('catching_player_id', db.Integer, db.ForeignKey('player.id')),
+        db.Column('caught_player_id', db.Integer, db.ForeignKey('player.id')),
+        db.Column('photo_reference', db.String(128), unique=True, nullable=False),
+        db.Column('timestamp', db.DateTime, server_default=func.now(), nullable=False)
+        )
+
+notification_player = db.Table('notification_player',
+        db.Column('notification_id', db.Integer, db.ForeignKey('notification.id')),
+        db.Column('player_id', db.Integer, db.ForeignKey('player.id')),
+        db.PrimaryKeyConstraint('notification_id', 'player_id'),
+        db.Column('been_shown', db.Boolean, server_default='True', nullable=False)
+        )
+
 class Game(db.Model):
     __tablename__ = 'game'
     id = db.Column(db.Integer, primary_key=True)
     name = db.Column(db.String(64), index=True, unique=True, nullable=False)
     password_hash = db.Column(db.String(128), nullable=False)
-    state = db.Column(db.Integer, default='1')
+    state = db.Column(db.Integer, server_default='1')
     start_time = db.Column(db.DateTime)
     end_time = db.Column(db.DateTime)
-    players = relationship(
-            'player',
-            secondary=game_player,
-            back_populates='games')
+    players = db.relationship(
+        'Player',
+        secondary=game_player,
+        back_populates='games')
+    objectives = db.relationship(
+        'Objective',
+        lazy='select',
+        backref=db.backref('game', lazy='joined'))
+    notifications = db.relationship(
+        'Notification',
+        lazy='select',
+        backref=db.backref('game', lazy='joined'))
 
 class Player(db.Model):
     __tablename = 'player'
@@ -26,10 +56,60 @@ class Player(db.Model):
     name = db.Column(db.String(64), unique=True, nullable=False)
     auth_hash = db.Column(db.String(128), unique=True, nullable=False)
     password_hash = db.Column(db.String(128))
-    games = relationship(
-            'game',
-            secondary=game_player,
-            back_populates='players')
+    games = db.relationship(
+        'Game',
+        secondary=game_player,
+        back_populates='players')
+    objectives_found = db.relationship(
+        'Objective',
+        secondary=player_found_objective,
+        back_populates='players')
+    caught_players = db.relationship(
+        'Player',
+        secondary=player_caught_player,
+        primaryjoin=(player_caught_player.c.catching_player_id == id),
+        secondaryjoin=(player_caught_player.c.caught_player_id == id),
+        backref=db.backref('caught_by', lazy='dynamic'), lazy='dynamic')
+    locations = db.relationship(
+        'Location',
+        lazy='select',
+        backref=db.backref('player', lazy='joined'))
+    notifications = db.relationship(
+        'Notification',
+        secondary=notification_player,
+        back_populates='recipients')
+
+class Objective(db.Model):
+    __tablename = 'objective'
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(64), nullable=False)
+    game_id = db.Column(db.Integer, db.ForeignKey('game.id'), nullable=False)
+    hash = db.Column(db.String(128), unique=True, nullable=False)
+    longitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None)) # maybe check asdecimal and decimal_return_scale later?
+    latitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None))
+    players = db.relationship(
+        'Player',
+        secondary=player_found_objective,
+        back_populates='objectives_found')
 
+class Location(db.Model):
+    __tablename = 'location'
+    id = db.Column(db.Integer, primary_key=True)
+    player_id = db.Column(db.Integer, db.ForeignKey('player.id'), nullable=False)
+    longitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None),nullable=False) # maybe check asdecimal and decimal_return_scale later?
+    latitude = db.Column(db.Numeric(precision=15, scale=10, asdecimal=False, decimal_return_scale=None),nullable=False)
+    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)
+
+class Notification(db.Model):
+    __tablename = 'notification'
+    id = db.Column(db.Integer, primary_key=True)
+    game_id = db.Column(db.Integer, db.ForeignKey('game.id'), nullable=False)
+    message = db.Column(db.Text, nullable=False)
+    type = db.Column(db.String(64), nullable=False, default='General')
+    timestamp = db.Column(db.DateTime, server_default=func.now(), nullable=False)
+    recipients = db.relationship(
+        'Player',
+        secondary=notification_player,
+        back_populates='notifications')
 
 #start_time = db.Column(db.DateTime, server_default=func.now())
diff --git a/migrations/README b/migrations/README
new file mode 100644
index 0000000..98e4f9c
--- /dev/null
+++ b/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
\ No newline at end of file
diff --git a/migrations/alembic.ini b/migrations/alembic.ini
new file mode 100644
index 0000000..f8ed480
--- /dev/null
+++ b/migrations/alembic.ini
@@ -0,0 +1,45 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
diff --git a/migrations/env.py b/migrations/env.py
new file mode 100644
index 0000000..9452179
--- /dev/null
+++ b/migrations/env.py
@@ -0,0 +1,96 @@
+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# 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)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from flask import current_app
+config.set_main_option(
+    'sqlalchemy.url',
+    str(current_app.extensions['migrate'].db.engine.url).replace('%', '%%'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# 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, target_metadata=target_metadata, literal_binds=True
+    )
+
+    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.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            process_revision_directives=process_revision_directives,
+            **current_app.extensions['migrate'].configure_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/migrations/script.py.mako b/migrations/script.py.mako
new file mode 100644
index 0000000..2c01563
--- /dev/null
+++ b/migrations/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/migrations/versions/08f2f998a4f6_update_models_to_database_documentation_.py b/migrations/versions/08f2f998a4f6_update_models_to_database_documentation_.py
new file mode 100644
index 0000000..a3bacb4
--- /dev/null
+++ b/migrations/versions/08f2f998a4f6_update_models_to_database_documentation_.py
@@ -0,0 +1,86 @@
+"""update models to database documentation 1.2
+
+Revision ID: 08f2f998a4f6
+Revises: db3681fb9273
+Create Date: 2020-07-02 18:45:23.912159
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '08f2f998a4f6'
+down_revision = 'db3681fb9273'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('location',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('player_id', sa.Integer(), nullable=False),
+    sa.Column('longitude', sa.Numeric(precision=15, scale=10, asdecimal=False), nullable=False),
+    sa.Column('latitude', sa.Numeric(precision=15, scale=10, asdecimal=False), nullable=False),
+    sa.Column('timestamp', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
+    sa.ForeignKeyConstraint(['player_id'], ['player.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('notification',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('game_id', sa.Integer(), nullable=False),
+    sa.Column('message', sa.Text(), nullable=False),
+    sa.Column('type', sa.String(length=64), nullable=False),
+    sa.Column('timestamp', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
+    sa.ForeignKeyConstraint(['game_id'], ['game.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('objective',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=64), nullable=False),
+    sa.Column('game_id', sa.Integer(), nullable=False),
+    sa.Column('hash', sa.String(length=128), nullable=False),
+    sa.Column('longitude', sa.Numeric(precision=15, scale=10, asdecimal=False), nullable=True),
+    sa.Column('latitude', sa.Numeric(precision=15, scale=10, asdecimal=False), nullable=True),
+    sa.ForeignKeyConstraint(['game_id'], ['game.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('hash')
+    )
+    op.create_table('player_caught_player',
+    sa.Column('catching_player_id', sa.Integer(), nullable=True),
+    sa.Column('caught_player_id', sa.Integer(), nullable=True),
+    sa.Column('photo_reference', sa.String(length=128), nullable=False),
+    sa.Column('timestamp', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
+    sa.ForeignKeyConstraint(['catching_player_id'], ['player.id'], ),
+    sa.ForeignKeyConstraint(['caught_player_id'], ['player.id'], ),
+    sa.UniqueConstraint('photo_reference')
+    )
+    op.create_table('player_found_objective',
+    sa.Column('game_id', sa.Integer(), nullable=False),
+    sa.Column('player_id', sa.Integer(), nullable=False),
+    sa.Column('timestamp', sa.DateTime(), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=False),
+    sa.ForeignKeyConstraint(['game_id'], ['game.id'], ),
+    sa.ForeignKeyConstraint(['player_id'], ['player.id'], ),
+    sa.PrimaryKeyConstraint('game_id', 'player_id')
+    )
+    op.create_table('notification_player',
+    sa.Column('notification_id', sa.Integer(), nullable=False),
+    sa.Column('player_id', sa.Integer(), nullable=False),
+    sa.Column('been_shown', sa.Boolean(), server_default='True', nullable=False),
+    sa.ForeignKeyConstraint(['notification_id'], ['notification.id'], ),
+    sa.ForeignKeyConstraint(['player_id'], ['player.id'], ),
+    sa.PrimaryKeyConstraint('notification_id', 'player_id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('notification_player')
+    op.drop_table('player_found_objective')
+    op.drop_table('player_caught_player')
+    op.drop_table('objective')
+    op.drop_table('notification')
+    op.drop_table('location')
+    # ### end Alembic commands ###
diff --git a/migrations/versions/db3681fb9273_add_game_and_player_model.py b/migrations/versions/db3681fb9273_add_game_and_player_model.py
new file mode 100644
index 0000000..877f5a2
--- /dev/null
+++ b/migrations/versions/db3681fb9273_add_game_and_player_model.py
@@ -0,0 +1,56 @@
+"""add game and player model
+
+Revision ID: db3681fb9273
+Revises: 
+Create Date: 2020-07-02 13:26:00.493728
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'db3681fb9273'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('game',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=64), nullable=False),
+    sa.Column('password_hash', sa.String(length=128), nullable=False),
+    sa.Column('state', sa.Integer(), nullable=True),
+    sa.Column('start_time', sa.DateTime(), nullable=True),
+    sa.Column('end_time', sa.DateTime(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_game_name'), 'game', ['name'], unique=True)
+    op.create_table('player',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=64), nullable=False),
+    sa.Column('auth_hash', sa.String(length=128), nullable=False),
+    sa.Column('password_hash', sa.String(length=128), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('auth_hash'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_table('game_player',
+    sa.Column('game_id', sa.Integer(), nullable=True),
+    sa.Column('player_id', sa.Integer(), nullable=True),
+    sa.Column('role', sa.String(length=16), nullable=True),
+    sa.ForeignKeyConstraint(['game_id'], ['game.id'], ),
+    sa.ForeignKeyConstraint(['player_id'], ['player.id'], )
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('game_player')
+    op.drop_table('player')
+    op.drop_index(op.f('ix_game_name'), table_name='game')
+    op.drop_table('game')
+    # ### end Alembic commands ###