Fix GitHub actions and add comments table (#1604)

* Fix MySQL and Postgres GitHub actions to properly test databases
* Add migration to add `comments` table

migrations/versions/0366ba6575ca_add_table_for_comments.py

@@ -0,0 +1,47 @@
+"""Add table for comments
+
+Revision ID: 0366ba6575ca
+Revises: 1093835a1051
+Create Date: 2020-08-14 00:46:54.161120
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "0366ba6575ca"
+down_revision = "1093835a1051"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "comments",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("type", sa.String(length=80), nullable=True),
+        sa.Column("content", sa.Text(), nullable=True),
+        sa.Column("date", sa.DateTime(), nullable=True),
+        sa.Column("author_id", sa.Integer(), nullable=True),
+        sa.Column("challenge_id", sa.Integer(), nullable=True),
+        sa.Column("user_id", sa.Integer(), nullable=True),
+        sa.Column("team_id", sa.Integer(), nullable=True),
+        sa.Column("page_id", sa.Integer(), nullable=True),
+        sa.ForeignKeyConstraint(["author_id"], ["users.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(
+            ["challenge_id"], ["challenges.id"], ondelete="CASCADE"
+        ),
+        sa.ForeignKeyConstraint(["page_id"], ["pages.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["team_id"], ["teams.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("comments")
+    # ### end Alembic commands ###