diff --git a/surfsense_backend/alembic/versions/79_add_public_share_to_chat_threads.py b/surfsense_backend/alembic/versions/79_add_public_share_to_chat_threads.py
index cb7ba555f..e1c21a353 100644
--- a/surfsense_backend/alembic/versions/79_add_public_share_to_chat_threads.py
+++ b/surfsense_backend/alembic/versions/79_add_public_share_to_chat_threads.py
@@ -10,8 +10,6 @@ public sharing of chat threads via secure tokenized URLs.
 
 from collections.abc import Sequence
 
-import sqlalchemy as sa
-
 from alembic import op
 
 # revision identifiers, used by Alembic.
@@ -24,20 +22,19 @@ depends_on: str | Sequence[str] | None = None
 def upgrade() -> None:
     """Add public sharing columns to new_chat_threads."""
     # Add public_share_token column
-    op.add_column(
-        "new_chat_threads",
-        sa.Column("public_share_token", sa.String(64), nullable=True),
+    op.execute(
+        """
+        ALTER TABLE new_chat_threads
+        ADD COLUMN IF NOT EXISTS public_share_token VARCHAR(64);
+        """
     )
 
-    # Add public_share_enabled column
-    op.add_column(
-        "new_chat_threads",
-        sa.Column(
-            "public_share_enabled",
-            sa.Boolean(),
-            nullable=False,
-            server_default="false",
-        ),
+    # Add public_share_enabled column with default false
+    op.execute(
+        """
+        ALTER TABLE new_chat_threads
+        ADD COLUMN IF NOT EXISTS public_share_enabled BOOLEAN NOT NULL DEFAULT FALSE;
+        """
     )
 
     # Add unique partial index on public_share_token (only non-null values)
@@ -45,7 +42,7 @@ def upgrade() -> None:
         """
         CREATE UNIQUE INDEX IF NOT EXISTS ix_new_chat_threads_public_share_token
         ON new_chat_threads(public_share_token)
-        WHERE public_share_token IS NOT NULL
+        WHERE public_share_token IS NOT NULL;
         """
     )
 
@@ -54,7 +51,7 @@ def upgrade() -> None:
         """
         CREATE INDEX IF NOT EXISTS ix_new_chat_threads_public_share_enabled
         ON new_chat_threads(public_share_enabled)
-        WHERE public_share_enabled = TRUE
+        WHERE public_share_enabled = TRUE;
         """
     )
 
@@ -63,5 +60,7 @@ def downgrade() -> None:
     """Remove public sharing columns from new_chat_threads."""
     op.execute("DROP INDEX IF EXISTS ix_new_chat_threads_public_share_enabled")
     op.execute("DROP INDEX IF EXISTS ix_new_chat_threads_public_share_token")
-    op.drop_column("new_chat_threads", "public_share_enabled")
-    op.drop_column("new_chat_threads", "public_share_token")
+    op.execute(
+        "ALTER TABLE new_chat_threads DROP COLUMN IF EXISTS public_share_enabled"
+    )
+    op.execute("ALTER TABLE new_chat_threads DROP COLUMN IF EXISTS public_share_token")