diff --git a/backend/migrations/versions/515abdefed7a_.py b/backend/migrations/versions/515abdefed7a_.py
new file mode 100644
index 00000000..57529e6d
--- /dev/null
+++ b/backend/migrations/versions/515abdefed7a_.py
@@ -0,0 +1,43 @@
+"""empty message
+
+Revision ID: 515abdefed7a
+Revises: 4505f00c4ebd
+Create Date: 2019-10-17 16:41:58.519224
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '515abdefed7a'
+down_revision = '4505f00c4ebd'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('proposal_subscribers',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('proposal_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['proposal_id'], ['proposal.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], )
+    )
+    op.add_column('proposal', sa.Column('accepted_with_funding', sa.Boolean(), nullable=True))
+    op.add_column('proposal', sa.Column('version', sa.String(length=255), nullable=True))
+    op.alter_column('proposal', 'deadline_duration',
+               existing_type=sa.INTEGER(),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('proposal', 'deadline_duration',
+               existing_type=sa.INTEGER(),
+               nullable=False)
+    op.drop_column('proposal', 'version')
+    op.drop_column('proposal', 'accepted_with_funding')
+    op.drop_table('proposal_subscribers')
+    # ### end Alembic commands ###
diff --git a/backend/migrations/versions/7fea7427e9d6_.py b/backend/migrations/versions/7fea7427e9d6_.py
new file mode 100644
index 00000000..3f88ba08
--- /dev/null
+++ b/backend/migrations/versions/7fea7427e9d6_.py
@@ -0,0 +1,47 @@
+"""empty message
+
+Revision ID: 7fea7427e9d6
+Revises: f24d53f211ef
+Create Date: 2019-10-24 12:18:39.734758
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '7fea7427e9d6'
+down_revision = 'f24d53f211ef'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('rfp_liker',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('rfp_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['rfp_id'], ['rfp.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], )
+    )
+    op.create_table('proposal_liker',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('proposal_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['proposal_id'], ['proposal.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], )
+    )
+    op.create_table('comment_liker',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('comment_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['comment_id'], ['comment.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], )
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('comment_liker')
+    op.drop_table('proposal_liker')
+    op.drop_table('rfp_liker')
+    # ### end Alembic commands ###
diff --git a/backend/migrations/versions/f24d53f211ef_.py b/backend/migrations/versions/f24d53f211ef_.py
new file mode 100644
index 00000000..89219882
--- /dev/null
+++ b/backend/migrations/versions/f24d53f211ef_.py
@@ -0,0 +1,40 @@
+"""empty message
+
+Revision ID: f24d53f211ef
+Revises: 515abdefed7a
+Create Date: 2019-10-23 16:32:02.161367
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'f24d53f211ef'
+down_revision = '515abdefed7a'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('proposal_follower',
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.Column('proposal_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['proposal_id'], ['proposal.id'], ),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], )
+    )
+    op.drop_table('proposal_subscribers')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+# ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('proposal_subscribers',
+    sa.Column('user_id', sa.INTEGER(), autoincrement=False, nullable=True),
+    sa.Column('proposal_id', sa.INTEGER(), autoincrement=False, nullable=True),
+    sa.ForeignKeyConstraint(['proposal_id'], ['proposal.id'], name='proposal_subscribers_proposal_id_fkey'),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], name='proposal_subscribers_user_id_fkey')
+    )
+    op.drop_table('proposal_follower')
+    # ### end Alembic commands ###