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# transit graph configs table structure

The transit_graph_configs table holds configuration parameters for a TransitGraph of a particular period_id Attributes follow

Field | Type | NULL allowed | Default Value
--- | --- | --- | ---
period_id* | INTEGER | NO |
config | TEXT | YES |

(* - Primary key)

The SQL statement for table and index creation is below.

    CREATE TABLE if not exists transit_graph_configs (period_id INTEGER UNIQUE NOT NULL PRIMARY KEY REFERENCES periods(period_id),
                                                      config    TEXT);

    INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('transit_graph_configs','period_id', 'The period this config is associated with.');
    INSERT INTO 'attributes_documentation' (name_table, attribute, description) VALUES('transit_graph_configs','mode_id', 'JSON string containing the configuration parameters.');