feat: add ability to run db migrations

backend/apps/web/internal/db.py

 from peewee import *
+from peewee_migrate import Router
 from config import SRC_LOG_LEVELS, DATA_DIR
 import os
 import logging
@@ -16,4 +17,6 @@ else:
 
 
 DB = SqliteDatabase(f"{DATA_DIR}/webui.db")
-DB.connect()
+router = Router(DB, migrate_dir="apps/web/internal/migrations", logger=log)
+router.run()
+DB.connect(reuse_if_open=True)

backend/apps/web/internal/migrations/001_initial_schema.py

+"""Peewee migrations -- 001_initial_schema.py.
+
+Some examples (model - class or model name)::
+
+    > Model = migrator.orm['table_name']            # Return model in current state by name
+    > Model = migrator.ModelClass                   # Return model in current state by name
+
+    > migrator.sql(sql)                             # Run custom SQL
+    > migrator.run(func, *args, **kwargs)           # Run python function with the given args
+    > migrator.create_model(Model)                  # Create a model (could be used as decorator)
+    > migrator.remove_model(model, cascade=True)    # Remove a model
+    > migrator.add_fields(model, **fields)          # Add fields to a model
+    > migrator.change_fields(model, **fields)       # Change fields
+    > migrator.remove_fields(model, *field_names, cascade=True)
+    > migrator.rename_field(model, old_field_name, new_field_name)
+    > migrator.rename_table(model, new_table_name)
+    > migrator.add_index(model, *col_names, unique=False)
+    > migrator.add_not_null(model, *field_names)
+    > migrator.add_default(model, field_name, default)
+    > migrator.add_constraint(model, name, sql)
+    > migrator.drop_index(model, *col_names)
+    > migrator.drop_not_null(model, *field_names)
+    > migrator.drop_constraints(model, *constraints)
+
+"""
+
+from contextlib import suppress
+
+import peewee as pw
+from peewee_migrate import Migrator
+
+
+with suppress(ImportError):
+    import playhouse.postgres_ext as pw_pext
+
+
+def migrate(migrator: Migrator, database: pw.Database, *, fake=False):
+    """Write your migrations here."""
+
+    @migrator.create_model
+    class Auth(pw.Model):
+        id = pw.CharField(max_length=255, unique=True)
+        email = pw.CharField(max_length=255)
+        password = pw.CharField(max_length=255)
+        active = pw.BooleanField()
+
+        class Meta:
+            table_name = "auth"
+
+    @migrator.create_model
+    class Chat(pw.Model):
+        id = pw.CharField(max_length=255, unique=True)
+        user_id = pw.CharField(max_length=255)
+        title = pw.CharField(max_length=255)
+        chat = pw.TextField()
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "chat"
+
+    @migrator.create_model
+    class ChatIdTag(pw.Model):
+        id = pw.CharField(max_length=255, unique=True)
+        tag_name = pw.CharField(max_length=255)
+        chat_id = pw.CharField(max_length=255)
+        user_id = pw.CharField(max_length=255)
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "chatidtag"
+
+    @migrator.create_model
+    class Document(pw.Model):
+        id = pw.AutoField()
+        collection_name = pw.CharField(max_length=255, unique=True)
+        name = pw.CharField(max_length=255, unique=True)
+        title = pw.CharField(max_length=255)
+        filename = pw.CharField(max_length=255)
+        content = pw.TextField(null=True)
+        user_id = pw.CharField(max_length=255)
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "document"
+
+    @migrator.create_model
+    class Modelfile(pw.Model):
+        id = pw.AutoField()
+        tag_name = pw.CharField(max_length=255, unique=True)
+        user_id = pw.CharField(max_length=255)
+        modelfile = pw.TextField()
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "modelfile"
+
+    @migrator.create_model
+    class Prompt(pw.Model):
+        id = pw.AutoField()
+        command = pw.CharField(max_length=255, unique=True)
+        user_id = pw.CharField(max_length=255)
+        title = pw.CharField(max_length=255)
+        content = pw.TextField()
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "prompt"
+
+    @migrator.create_model
+    class Tag(pw.Model):
+        id = pw.CharField(max_length=255, unique=True)
+        name = pw.CharField(max_length=255)
+        user_id = pw.CharField(max_length=255)
+        data = pw.TextField(null=True)
+
+        class Meta:
+            table_name = "tag"
+
+    @migrator.create_model
+    class User(pw.Model):
+        id = pw.CharField(max_length=255, unique=True)
+        name = pw.CharField(max_length=255)
+        email = pw.CharField(max_length=255)
+        role = pw.CharField(max_length=255)
+        profile_image_url = pw.CharField(max_length=255)
+        timestamp = pw.DateField()
+
+        class Meta:
+            table_name = "user"
+
+
+def rollback(migrator: Migrator, database: pw.Database, *, fake=False):
+    """Write your rollback migrations here."""
+
+    migrator.remove_model("user")
+
+    migrator.remove_model("tag")
+
+    migrator.remove_model("prompt")
+
+    migrator.remove_model("modelfile")
+
+    migrator.remove_model("document")
+
+    migrator.remove_model("chatidtag")
+
+    migrator.remove_model("chat")
+
+    migrator.remove_model("auth")

backend/apps/web/internal/migrations/README.md

+# Database Migrations
+
+This directory contains all the database migrations for the web app.
+Migrations are done using the [`peewee-migrate`](https://github.com/klen/peewee_migrate) library.
+
+Migrations are automatically ran at app startup.
+
+## Creating a migration
+
+Have you made a change to the schema of an existing model?
+You will need to create a migration file to ensure that existing databases are updated for backwards compatibility.
+
+1. Have a database file (`webui.db`) that has the old schema prior to any of your changes.
+2. Make your changes to the models.
+3. From the `backend` directory, run the following command:
+   ```bash
+   pw_migrate create --auto --auto-source apps.web.models --database sqlite:///${SQLITE_DB} --directory apps/web/internal/migrations ${MIGRATION_NAME}
+   ```
+   - `$SQLITE_DB` should be the path to the database file.
+   - `$MIGRATION_NAME` should be a descriptive name for the migration.
+4. The migration file will be created in the `apps/web/internal/migrations` directory.

backend/requirements.txt

@@ -14,6 +14,7 @@ uuid
 requests
 aiohttp
 peewee
+peewee-migrate
 bcrypt
 
 litellm==1.30.7