diff --git a/alembic.ini b/alembic.ini
new file mode 100644
index 0000000..ae936c1
--- /dev/null
+++ b/alembic.ini
@@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = mysql+pymysql:///root@localhost/odyfo?unix_socket=.mysql/mysql.sock
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# 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/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/env.py b/migrations/env.py
new file mode 100644
index 0000000..70518a2
--- /dev/null
+++ b/migrations/env.py
@@ -0,0 +1,77 @@
+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)
+
+# 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,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    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.
+
+    """
+    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
+        )
+
+        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/05f3ae5db7c7_rename_modified_to_updated.py b/migrations/versions/05f3ae5db7c7_rename_modified_to_updated.py
new file mode 100644
index 0000000..05ad985
--- /dev/null
+++ b/migrations/versions/05f3ae5db7c7_rename_modified_to_updated.py
@@ -0,0 +1,39 @@
+"""rename modified to updated
+
+Revision ID: 05f3ae5db7c7
+Revises: 970563653ece
+Create Date: 2020-07-22 23:56:38.694837
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "05f3ae5db7c7"
+down_revision = "970563653ece"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    tables = {
+        "cities": "modified",
+        "games": "modified",
+        "payments": "modified",
+        "player_availabilities": "modified",
+        "player_cancel_games": "modified",
+        "purchase_games": "modified",
+        "sports": "modified",
+        "teams": "modified",
+        "user_ratings": "modified",
+        "users": "modified",
+        "venues": "modified",
+    }
+    for table, field in tables.items():
+        with op.batch_alter_table(table) as batch_op:
+            batch_op.alter_column(column_name=field, new_column_name="updated")
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/0a4f01e489de_set_users_status_default_value.py b/migrations/versions/0a4f01e489de_set_users_status_default_value.py
new file mode 100644
index 0000000..d02ef48
--- /dev/null
+++ b/migrations/versions/0a4f01e489de_set_users_status_default_value.py
@@ -0,0 +1,25 @@
+"""set users status default value
+
+Revision ID: 0a4f01e489de
+Revises: 15a14d428bff
+Create Date: 2020-09-10 23:54:22.624598
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "0a4f01e489de"
+down_revision = "15a14d428bff"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("users") as batch_op:
+        batch_op.alter_column(column_name="status", server_default=sa.text("0"))
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/1387db583e1d_set_default_value_for_badge.py b/migrations/versions/1387db583e1d_set_default_value_for_badge.py
new file mode 100644
index 0000000..712d6e8
--- /dev/null
+++ b/migrations/versions/1387db583e1d_set_default_value_for_badge.py
@@ -0,0 +1,25 @@
+"""set default value for badge
+
+Revision ID: 1387db583e1d
+Revises: 9ee45f714f8b
+Create Date: 2020-09-15 19:31:15.709945
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "1387db583e1d"
+down_revision = "9ee45f714f8b"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("users") as batch_op:
+        batch_op.alter_column(column_name="badge", server_default=sa.text("0"))
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/15a14d428bff_sanitize_nullable_and_non_nullable_.py b/migrations/versions/15a14d428bff_sanitize_nullable_and_non_nullable_.py
new file mode 100644
index 0000000..d50606e
--- /dev/null
+++ b/migrations/versions/15a14d428bff_sanitize_nullable_and_non_nullable_.py
@@ -0,0 +1,53 @@
+"""sanitize nullable and non-nullable fields
+
+Revision ID: 15a14d428bff
+Revises: 05f3ae5db7c7
+Create Date: 2020-09-10 12:27:31.889962
+
+"""
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = "15a14d428bff"
+down_revision = "05f3ae5db7c7"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    nullable = {
+        "users": ["full_name", "email", "mobile"],
+        "cities": ["name"],
+        "web_bookings": ["name", "email", "contact", "message", "game", "city"],
+        "games": ["name", "price"],
+        "venues": ["address", "name"],
+        "sports": ["spanish_name"],
+        "user_ratings": ["rating"],
+        "sports": ["name"],
+    }
+    non_nullable = {
+        "users": ["social_id", "type"],
+    }
+    for table, field in nullable.items():
+        for item in field:
+            query = "UPDATE {0} SET {1} = '' WHERE {1} IS NULL".format(table, item)
+            op.execute(query)
+            with op.batch_alter_table(table) as batch_op:
+                batch_op.alter_column(
+                    column_name=item, nullable=False, server_default=None
+                )
+    for table, field in non_nullable.items():
+        for item in field:
+            with op.batch_alter_table(table) as batch_op:
+                batch_op.alter_column(
+                    column_name=item, nullable=True, server_default=None
+                )
+            query = "UPDATE {0} SET {1} = NULL WHERE {1} = '' OR {1} = '0'".format(
+                table, item
+            )
+            op.execute(query)
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/970563653ece_set_modified_updated_as_nullable.py b/migrations/versions/970563653ece_set_modified_updated_as_nullable.py
new file mode 100644
index 0000000..19ef203
--- /dev/null
+++ b/migrations/versions/970563653ece_set_modified_updated_as_nullable.py
@@ -0,0 +1,48 @@
+"""set modified/updated as nullable
+
+Revision ID: 970563653ece
+Revises: 
+Create Date: 2020-07-22 23:40:07.674252
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "970563653ece"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    tables = {
+        "cities": ["modified"],
+        "games": ["modified", "cancel_date"],
+        "payments": ["modified"],
+        "player_availabilities": ["modified"],
+        "player_cancel_games": ["modified"],
+        "purchase_games": ["modified"],
+        "sports": ["modified"],
+        "teams": ["modified"],
+        "user_ratings": ["modified"],
+        "users": ["modified"],
+        "venues": ["modified"],
+        "venue_images": ["updated"],
+        "web_bookings": ["updated"],
+    }
+    for table, field in tables.items():
+        for item in field:
+            with op.batch_alter_table(table) as batch_op:
+                batch_op.alter_column(
+                    column_name=item, nullable=True, server_default=None
+                )
+            query = "UPDATE {0} SET {1} = NULL WHERE {1} = '0000-00-00 00:00:00'".format(
+                table, item
+            )
+            op.execute(query)
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/9ee45f714f8b_set_unique_fields_in_users_table.py b/migrations/versions/9ee45f714f8b_set_unique_fields_in_users_table.py
new file mode 100644
index 0000000..2ef36b4
--- /dev/null
+++ b/migrations/versions/9ee45f714f8b_set_unique_fields_in_users_table.py
@@ -0,0 +1,31 @@
+"""set unique fields in users table
+
+Revision ID: 9ee45f714f8b
+Revises: 0a4f01e489de
+Create Date: 2020-09-12 18:25:17.026880
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "9ee45f714f8b"
+down_revision = "0a4f01e489de"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    fields = ["email", "mobile"]
+    for item in fields:
+        query = "DELETE FROM users WHERE email = '' AND status = 0"
+        op.execute(query)
+        with op.batch_alter_table("users") as batch_op:
+            batch_op.create_unique_constraint(
+                constraint_name="uq_users_{}".format(item), columns=[item],
+            )
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/d994081ed483_set_otp_as_integer.py b/migrations/versions/d994081ed483_set_otp_as_integer.py
new file mode 100644
index 0000000..2ad76a0
--- /dev/null
+++ b/migrations/versions/d994081ed483_set_otp_as_integer.py
@@ -0,0 +1,29 @@
+"""set otp as integer
+
+Revision ID: d994081ed483
+Revises: 1387db583e1d
+Create Date: 2020-09-25 07:11:21.603504
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "d994081ed483"
+down_revision = "1387db583e1d"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("users") as batch_op:
+        batch_op.alter_column(
+            column_name="otp", existing_type=sa.String(length=255), type_=sa.Integer,
+        )
+    query = "SELECT CAST(otp AS INTEGER) from users"
+    op.execute(query)
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/e443e876bf33_add_foreign_keys.py b/migrations/versions/e443e876bf33_add_foreign_keys.py
new file mode 100644
index 0000000..4c18430
--- /dev/null
+++ b/migrations/versions/e443e876bf33_add_foreign_keys.py
@@ -0,0 +1,52 @@
+"""add foreign keys
+
+Revision ID: e443e876bf33
+Revises: f8ef6bad794a
+Create Date: 2020-10-26 14:37:21.156557
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "e443e876bf33"
+down_revision = "f8ef6bad794a"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    tables = {
+        "games": ["user_id", "city_id", "venue_id", "sports_id"],
+        "payments": ["user_id", "game_id"],
+        "player_availabilities": ["game_id", "player_id"],
+        "player_cancel_games": ["game_id", "player_id"],
+        "purchase_games": ["game_id", "user_id"],
+        "teams": ["game_id", "user_id"],
+        "users": ["city_id"],
+        "user_ratings": ["game_id", "user_id", "player_id"],
+        "venues": ["user_id", "sports_id"],
+        "venue_images": ["venue_id", "user_id"],
+    }
+    referent_tables = {
+        "user_id": "users",
+        "city_id": "cities",
+        "venue_id": "venues",
+        "sports_id": "sports",
+        "game_id": "games",
+        "player_id": "users",
+    }
+    for table, field in tables.items():
+        for item in field:
+            with op.batch_alter_table(table) as batch_op:
+                batch_op.create_foreign_key(
+                    constraint_name="fk_{}".format(item),
+                    referent_table=referent_tables[item],
+                    local_cols=[item],
+                    remote_cols=["id"],
+                )
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/f8ef6bad794a_add_forgot_password_field.py b/migrations/versions/f8ef6bad794a_add_forgot_password_field.py
new file mode 100644
index 0000000..053b5b5
--- /dev/null
+++ b/migrations/versions/f8ef6bad794a_add_forgot_password_field.py
@@ -0,0 +1,27 @@
+"""add forgot_password field
+
+Revision ID: f8ef6bad794a
+Revises: d994081ed483
+Create Date: 2020-10-08 18:04:08.204841
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "f8ef6bad794a"
+down_revision = "d994081ed483"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("users") as batch_op:
+        batch_op.add_column(
+            sa.Column("forgot_password", sa.Integer, server_default=sa.text("0")),
+        )
+
+
+def downgrade():
+    pass