Rework market_depth_raw & stg_market_depth

[jonathan-kee]

(Source) Raw prices data

1. prices_raw_20270726.csv
2. prices_raw_20270727.csv
3. prices_raw_20270728.csv
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   (Staging) Add metadata like date & time
4. merge into table Stg_prices.sql
5. Date and time column from raw file name
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   (Analytics) Presentation layer excel