Merge pull request #44 from spacemansteve/master

forgot alembic file for data links

.gitignore

@@ -99,3 +99,6 @@ ENV/
 
 # mypy
 .mypy_cache/
+
+# emacs
+*~

alembic/versions/991505386bc9_added_links.py

@@ -0,0 +1,40 @@
+"""added links
+
+Revision ID: 991505386bc9
+Revises: 104f440cf5d5
+Create Date: 2018-02-14 09:42:29.869790
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '991505386bc9'
+down_revision = '104f440cf5d5'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# datalinks info is in nonbib data
+# it is not stored as a separate column
+# we just need to a column for the timestamp 
+#   of when links data was processed (sent to persistent store)
+
+def upgrade():
+    # sqlite doesn't have ALTER command
+    cx = op.get_context()
+    if 'sqlite' in cx.connection.engine.name:
+        with op.batch_alter_table("records") as batch_op:
+            batch_op.add_column(sa.Column('datalinks_processed', sa.TIMESTAMP))
+
+    else:
+        op.add_column('records', sa.Column('datalinks_processed', sa.TIMESTAMP))
+
+
+def downgrade():
+    cx = op.get_context()
+    if 'sqlite' in cx.connection.engine.name:
+        with op.batch_alter_table("records") as batch_op:
+            batch_op.drop_column('datalinks_processed')
+    else:
+        op.drop_column('records', 'datalinks_processed')
+