Remove unique constraint on ofxsource.fid

Because we have several financial institutions with the same FID value.
Yeah.

alembic/versions/16ac2bbf8b81_ofxsource_fid_nonunique.py

@@ -0,0 +1,24 @@
+"""ofxsource_fid_nonunique
+
+Revision ID: 16ac2bbf8b81
+Revises: 3ec1289eae7a
+Create Date: 2016-07-20 15:41:03.117666
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '16ac2bbf8b81'
+down_revision = '3ec1289eae7a'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+def upgrade():
+    op.drop_constraint('uq_ofxsource_fid', 'ofxsource', type_='unique')
+
+
+def downgrade():
+    op.create_unique_constraint('uq_ofxsource_fid', 'ofxsource', ['fid'])