diff --git a/src/backend/base/langflow/alembic/versions/1f4d6df60295_add_default_fields_column.py b/src/backend/base/langflow/alembic/versions/1f4d6df60295_add_default_fields_column.py
index 7b69058c2..7cf2fd083 100644
--- a/src/backend/base/langflow/alembic/versions/1f4d6df60295_add_default_fields_column.py
+++ b/src/backend/base/langflow/alembic/versions/1f4d6df60295_add_default_fields_column.py
@@ -22,7 +22,6 @@ depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
     conn = op.get_bind()
     inspector = Inspector.from_engine(conn)  # type: ignore
-    table_names = inspector.get_table_names()
     # ### commands auto generated by Alembic - please adjust! ###
     column_names = [column["name"] for column in inspector.get_columns("variable")]
     with op.batch_alter_table("variable", schema=None) as batch_op:
@@ -35,7 +34,6 @@ def upgrade() -> None:
 def downgrade() -> None:
     conn = op.get_bind()
     inspector = Inspector.from_engine(conn)  # type: ignore
-    table_names = inspector.get_table_names()
     # ### commands auto generated by Alembic - please adjust! ###
     column_names = [column["name"] for column in inspector.get_columns("variable")]
     with op.batch_alter_table("variable", schema=None) as batch_op:
diff --git a/src/backend/base/langflow/alembic/versions/c153816fd85f_set_name_and_value_to_not_nullable.py b/src/backend/base/langflow/alembic/versions/c153816fd85f_set_name_and_value_to_not_nullable.py
new file mode 100644
index 000000000..26cf872ab
--- /dev/null
+++ b/src/backend/base/langflow/alembic/versions/c153816fd85f_set_name_and_value_to_not_nullable.py
@@ -0,0 +1,52 @@
+"""Set name and value to not nullable
+
+Revision ID: c153816fd85f
+Revises: 1f4d6df60295
+Create Date: 2024-04-30 14:31:23.898995
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.engine.reflection import Inspector
+
+# revision identifiers, used by Alembic.
+revision: str = "c153816fd85f"
+down_revision: Union[str, None] = "1f4d6df60295"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    inspector = Inspector.from_engine(conn)  # type: ignore
+    # ### commands auto generated by Alembic - please adjust! ###
+    columns = inspector.get_columns("variable")
+    with op.batch_alter_table("variable", schema=None) as batch_op:
+        name_column = [column for column in columns if column["name"] == "name"][0]
+        if name_column and name_column[0]["nullable"]:
+            batch_op.alter_column("name", existing_type=sa.VARCHAR(), nullable=False)
+        value_column = [column for column in columns if column["name"] == "value"][0]
+        if value_column and value_column[0]["nullable"]:
+            batch_op.alter_column("value", existing_type=sa.VARCHAR(), nullable=False)
+
+
+# ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    inspector = Inspector.from_engine(conn)  # type: ignore
+    columns = inspector.get_columns("variable")
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table("variable", schema=None) as batch_op:
+        name_column = [column for column in columns if column["name"] == "name"][0]
+        if name_column and not name_column[0]["nullable"]:
+            batch_op.alter_column("name", existing_type=sa.VARCHAR(), nullable=True)
+        value_column = [column for column in columns if column["name"] == "value"][0]
+        if value_column and not value_column[0]["nullable"]:
+            batch_op.alter_column("name", existing_type=sa.VARCHAR(), nullable=True)
+
+    # ### end Alembic commands ###
diff --git a/src/backend/base/langflow/components/models/AzureOpenAIModel.py b/src/backend/base/langflow/components/models/AzureOpenAIModel.py
index b6d3607f3..a2ee20b28 100644
--- a/src/backend/base/langflow/components/models/AzureOpenAIModel.py
+++ b/src/backend/base/langflow/components/models/AzureOpenAIModel.py
@@ -1,6 +1,5 @@
 from typing import Optional
 
-from langchain.llms.base import BaseLanguageModel
 from langchain_openai import AzureChatOpenAI
 from pydantic.v1 import SecretStr
 
diff --git a/src/backend/base/langflow/components/models/ChatLiteLLMModel.py b/src/backend/base/langflow/components/models/ChatLiteLLMModel.py
index 23ac483cb..95574f0a5 100644
--- a/src/backend/base/langflow/components/models/ChatLiteLLMModel.py
+++ b/src/backend/base/langflow/components/models/ChatLiteLLMModel.py
@@ -4,7 +4,7 @@ from langchain_community.chat_models.litellm import ChatLiteLLM, ChatLiteLLMExce
 
 from langflow.base.constants import STREAM_INFO_TEXT
 from langflow.base.models.model import LCModelComponent
-from langflow.field_typing import BaseLanguageModel, Text
+from langflow.field_typing import Text
 
 
 class ChatLiteLLMModelComponent(LCModelComponent):
diff --git a/src/backend/base/langflow/schema/schema.py b/src/backend/base/langflow/schema/schema.py
index 979c78920..5d2967dac 100644
--- a/src/backend/base/langflow/schema/schema.py
+++ b/src/backend/base/langflow/schema/schema.py
@@ -4,7 +4,7 @@ from typing import Literal, Optional
 from langchain_core.documents import Document
 from langchain_core.messages import BaseMessage
 from pydantic import BaseModel, model_validator
-from langchain_core.messages import HumanMessage, AIMessage, BaseMessage
+from langchain_core.messages import HumanMessage, AIMessage
 
 
 class Record(BaseModel):
diff --git a/src/backend/base/langflow/services/database/models/variable/model.py b/src/backend/base/langflow/services/database/models/variable/model.py
index 5c56f5b6d..bf61c25dc 100644
--- a/src/backend/base/langflow/services/database/models/variable/model.py
+++ b/src/backend/base/langflow/services/database/models/variable/model.py
@@ -13,8 +13,8 @@ def utc_now():
 
 
 class VariableBase(SQLModel):
-    name: Optional[str] = Field(None, description="Name of the variable")
-    value: Optional[str] = Field(None, description="Encrypted value of the variable")
+    name: str = Field(description="Name of the variable")
+    value: str = Field(description="Encrypted value of the variable")
     default_fields: Optional[List[str]] = Field(sa_column=Column(JSON))
     type: Optional[str] = Field(None, description="Type of the variable")
 
diff --git a/src/backend/base/langflow/services/database/service.py b/src/backend/base/langflow/services/database/service.py
index 5ca20c642..ee2812d32 100644
--- a/src/backend/base/langflow/services/database/service.py
+++ b/src/backend/base/langflow/services/database/service.py
@@ -133,7 +133,7 @@ class DatabaseService(Service):
         alembic_cfg = Config(stdout=buffer)
         # alembic_cfg.attributes["connection"] = session
         alembic_cfg.set_main_option("script_location", str(self.script_location))
-        alembic_cfg.set_main_option("sqlalchemy.url", self.database_url.replace('%', '%%'))
+        alembic_cfg.set_main_option("sqlalchemy.url", self.database_url.replace("%", "%%"))
 
         should_initialize_alembic = False
         with Session(self.engine) as session: