[Refactor] Use frappe df.fieldtypes as generic data types

[frappe]

[Refactor] Use frappe df.fieldtypes as generic data types

[nextchamp-saqib]

Decided to use basic and commonly used data types

insights/insights/constants.py

Lines 11 to 22 in 7c6e38e

	COLUMN_TYPES = {
	"Integer": ("int", "11"),
	"Long Int": ("bigint", "20"),
	"Decimal": ("decimal", "21,9"),
	"Text": ("text", ""),
	"Long Text": ("longtext", ""),
	"Date": ("date", ""),
	"Datetime": ("datetime", "6"),
	"Time": ("time", "6"),
	"Text": ("text", ""),
	"String": ("varchar", "255"),
	}