feat(sqlite): CI Tests for Alembic and SQLite (#3358)

Co-authored-by: Matt Zhou <mattzh1314@gmail.com>

alembic/versions/1c8880d671ee_make_an_blocks_agents_mapping_table.py

@@ -11,6 +11,7 @@ from typing import Sequence, Union
 import sqlalchemy as sa
 
 from alembic import op
+from letta.settings import settings
 
 # revision identifiers, used by Alembic.
 revision: str = "1c8880d671ee"
@@ -20,6 +21,10 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
+    # Skip this migration for SQLite
+    if not settings.letta_pg_uri_no_default:
+        return
+
     # ### commands auto generated by Alembic - please adjust! ###
     op.create_unique_constraint("unique_block_id_label", "block", ["id", "label"])
 
@@ -46,6 +51,10 @@ def upgrade() -> None:
 
 
 def downgrade() -> None:
+    # Skip this migration for SQLite
+    if not settings.letta_pg_uri_no_default:
+        return
+
     # ### commands auto generated by Alembic - please adjust! ###
     op.drop_constraint("unique_block_id_label", "block", type_="unique")
     op.drop_table("blocks_agents")