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Andrew Daniels
0848a8a486
* ENH: Adds support for supplementary asset mappings - Adds a supplementary_mappings table to the assets.db, to hold point- in-time mappings of sids to arbitrary categories of values, e.g. alternative identifiers. This bumps ASSET_DB_VERSION. - Adds supplementary_map and supplementary_map_by_sid to AssetFinder, caches of the underlying table that are fully populated on first access, which map the supplementary values to sids and vice versa, respectively. - Adds lookup_by_supplementary_mapping method, which fronts supplementary_map to query for the asset last known to have held a value at a given dt. - Add get_supplementary_field method, which fronts supplementary_map_by_sid to query for the last known value held by an asset at a given dt.