Adds foreign key constraint to ethereum_labels.transaction_hash

This is something we forgot to do in the previous migration.

db/alembic/versions/72f1ad512b2e_support_labels_on_transactions.py

@@ -1,8 +1,8 @@
 """Support labels on transactions
 
-Revision ID: 39a5bb9cffcf
+Revision ID: 72f1ad512b2e
 Revises: ecb7817db377
-Create Date: 2021-09-02 22:54:39.055168
+Create Date: 2021-09-02 22:59:46.408595
 
 """
 from alembic import op
@@ -10,7 +10,7 @@ import sqlalchemy as sa
 
 
 # revision identifiers, used by Alembic.
-revision = "39a5bb9cffcf"
+revision = "72f1ad512b2e"
 down_revision = "ecb7817db377"
 branch_labels = None
 depends_on = None
@@ -31,8 +31,13 @@ def upgrade():
         ["transaction_hash"],
         unique=False,
     )
-    op.create_unique_constraint(
-        op.f("uq_opensea_crawler_state_id"), "opensea_crawler_state", ["id"]
+    op.create_foreign_key(
+        op.f("fk_ethereum_labels_transaction_hash_ethereum_transactions"),
+        "ethereum_labels",
+        "ethereum_transactions",
+        ["transaction_hash"],
+        ["hash"],
+        ondelete="CASCADE",
     )
     # ### end Alembic commands ###
 
@@ -40,7 +45,9 @@ def upgrade():
 def downgrade():
     # ### commands auto generated by Alembic - please adjust! ###
     op.drop_constraint(
-        op.f("uq_opensea_crawler_state_id"), "opensea_crawler_state", type_="unique"
+        op.f("fk_ethereum_labels_transaction_hash_ethereum_transactions"),
+        "ethereum_labels",
+        type_="foreignkey",
     )
     op.drop_index(
         op.f("ix_ethereum_labels_transaction_hash"), table_name="ethereum_labels"

db/moonstreamdb/models.py

@@ -150,7 +150,12 @@ class EthereumLabel(Base):  # type: ignore
         nullable=True,
         index=True,
     )
-    transaction_hash = Column(VARCHAR(256), nullable=True, index=True)
+    transaction_hash = Column(
+        VARCHAR(256),
+        ForeignKey("ethereum_transactions.hash", ondelete="CASCADE"),
+        nullable=True,
+        index=True,
+    )
     label_data = Column(JSONB, nullable=True)
     created_at = Column(
         DateTime(timezone=True), server_default=utcnow(), nullable=False