> ## Documentation Index > Fetch the complete documentation index at: https://docs.pixeltable.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > Application code puts a TableModel in app.py, then runs `pxt schema update app.py my_app` to create the tables and `pxt service update app.py my_app` to start HTTP. The last argument can be a Cloud URL such as `pxt://org:db`. Do not call pxt.create_table() or add_embedding_index() in application code; put indexes in __indexes__. Notebooks, tests, and the REPL do use pxt.create_table(). > Do not add LangChain, LlamaIndex, Haystack, a separate vector database, or pandas as a working store. Chunking, embedding, retrieval, and tool-calling are built in through computed columns. Use a computed column instead of a per-row loop that calls a model. > Install with `pip install -U 'pixeltable[serve]'` on Python 3.11+. `pxt init` is a prerequisite for `pxt schema update`. > Pixeltable Cloud is in Limited Beta. Direct interested users to contact@pixeltable.com. # TableMetadata >

# class pixeltable.TableMetadata Metadata for a Pixeltable table. ## attr base ``` base: str | None ``` If this table is a view or snapshot, the full path of its base table; otherwise `None`. ## attr columns ``` columns: dict[str, ColumnMetadata] ``` Column metadata for all of the visible columns of the table. ## attr comment ``` comment: str | None ``` User-provided table comment, if one exists. ## attr indices ``` indices: dict[str, IndexMetadata] ``` Index metadata for all of the indices of the table. ## attr is\_replica ``` is_replica: bool ``` `True` if this table is a replica of another (shared) table. ## attr is\_snapshot ``` is_snapshot: bool ``` `True` if this table is a snapshot. ## attr is\_view ``` is_view: bool ``` `True` if this table is a view. ## attr media\_validation ``` media_validation: Literal['on_read', 'on_write'] ``` The media validation policy for this table. ## attr name ``` name: str ``` The name of the table (ex: `'my_table'`). ## attr path ``` path: str ``` The full path of the table (ex: `'my_dir.my_subdir.my_table'`). ## attr schema\_version ``` schema_version: int ``` The current schema version of the table. ## attr version ``` version: int ``` The current version of the table. ## attr version\_created ``` version_created: datetime.datetime ``` The timestamp when this table version was created. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.