What should I do if I want to change the table structure in the Langflow database

[qq745639151]

I have the following requirements

1. I want to add a table for langflow to store our custom workflow running records
2. I want to modify the flow table to allow different flows to use the same name

Does Langflow support users to customize and modify databases？
@dosu

[dosubot]

To add a new table for storing custom workflow running records and modify the flow table in Langflow, you can follow these steps:

1. Add a New Table:

   • Define a new model using SQLModel, which Langflow uses for database interactions. Create a new Python class representing your table, including the necessary fields and relationships.

2. Modify the flow Table:

   • To allow different flows to use the same name, you need to adjust the unique constraint on the name field. In the Flow class, located in src/backend/langflow/services/database/models/flow/model.py, remove or modify the UniqueConstraint for the name field:

   __table_args__ = (
       # Remove or modify this constraint
       # UniqueConstraint("user_id", "name", name="unique_flow_name"),
       UniqueConstraint("user_id", "endpoint_name", name="unique_flow_endpoint_name"),
   )

3. Handle Migrations:

   • Langflow uses Alembic for database migrations. After making changes to your models, you need to create and apply a new migration script. Use the migration command in Langflow to handle this process. You can run the migration in test mode first to ensure everything is set up correctly, and then apply the changes.

Langflow supports customizing and modifying the database schema through these steps, allowing you to tailor the database to your specific needs ^[1][2].

To continue talking to Dosu, mention @dosu.

---

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[qq745639151]

To add a new table for storing custom workflow running records and modify the flow table in Langflow, you can follow these steps:

1. Add a New Table:

   • Define a new model using SQLModel, which Langflow uses for database interactions. Create a new Python class representing your table, including the necessary fields and relationships.

2. Modify the flow Table:

   • To allow different flows to use the same name, you need to adjust the unique constraint on the name field. In the Flow class, located in src/backend/langflow/services/database/models/flow/model.py, remove or modify the UniqueConstraint for the name field:

   table_args = (
   # Remove or modify this constraint
   # UniqueConstraint("user_id", "name", name="unique_flow_name"),
   UniqueConstraint("user_id", "endpoint_name", name="unique_flow_endpoint_name"),
   )

3. Handle Migrations:

   • Langflow uses Alembic for database migrations. After making changes to your models, you need to create and apply a new migration script. Use the migration command in Langflow to handle this process. You can run the migration in test mode first to ensure everything is set up correctly, and then apply the changes.

Langflow supports customizing and modifying the database schema through these steps, allowing you to tailor the database to your specific needs [1][2].

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Other

If I create a new migration script. how does the langflow load it ? @dosu

[dosubot]

Langflow loads and applies new migration scripts using Alembic. When you create a new migration script, it is stored in the alembic directory, as specified in the alembic.ini file ^[1]. To apply the migration, you can use the langflow migration command, which utilizes Alembic to run the migration scripts and update the database schema. This command ensures that the latest changes are applied to the database ^[2].

To continue talking to Dosu, mention @dosu.

---

^{Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Other}

[qq745639151]

Langflow loads and applies new migration scripts using Alembic. When you create a new migration script, it is stored in the alembic directory, as specified in the alembic.ini file [1]. To apply the migration, you can use the langflow migration command, which utilizes Alembic to run the migration scripts and update the database schema. This command ensures that the latest changes are applied to the database [2].

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Other

I don't want to change anything in langflow directory. I want to put the migration scripts in my own directory. What should I do in this situation to make Langflow load my modifications to the langflow database？ @dosu

[dosubot]

To make Langflow load migration scripts from your own directory instead of the default Langflow directory, you need to modify the script_location setting in the alembic.ini file. Change the script_location to point to your desired directory path. For example:

[alembic]
# path to migration scripts
script_location = /path/to/your/migration/scripts

Replace /path/to/your/migration/scripts with the actual path to your directory containing the migration scripts ^[1].

To continue talking to Dosu, mention @dosu.

---

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