Python script to convert the text file that is inside the compressed .bak project file from software Magic Set Editor to a .db sqlite3 file. Please read the comments to custom it your way

DBFileGenerator.py

#!/usr/bin/python3
"""
The MIT License (MIT)
Copyright (c) 2016 Rafael Gauna Trindade
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""

#!/usr/bin/python3
from mse import magicseteditor
import sys, os

if (len(sys.argv) != 2):
    print("Insira o nome do arquivo .bak!")
    sys.exit(1)

bakfile = sys.argv[1]
iName = bakfile.rfind('/')
setname = bakfile[iName+1:bakfile.find('.',iName+1)]
msefile = setname + "/set"
dbfile = setname + ".db"

if not os.path.isdir(setname):
    os.system("mkdir " + setname)
os.system("unzip -oqq {a} -d {b}/".format(a=bakfile, b=setname))

to_remove = [
    'has_styling',
    'notes',
    'time_created',
    'time_modified',
]

cards = magicseteditor(msefile)
cards.remove_fields(to_remove)
cards.normalize()
cards.optimize()
cards.create_sqlite_table(dbfile)
cards.dump_sqlite_table(dbfile)

mse.py

"""
The MIT License (MIT)
Copyright (c) 2016 Rafael Gauna Trindade
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""
import os, sqlite3

class magicseteditor:
    def __init__(self, file):
        with open(file) as fp:
            s = fp.read()
        lines = s.split('\n')
        
        firstCard = lines.index('card:')
        cards = list()
        card = None
        key, value = None, None

        # cards
        for line in lines[firstCard:]:
            if line == 'card:':
                if card is not None:
                    card[key] = value
                    cards.append(card)
                card = dict()
            elif line.count('\t'):
                if line.count('\t') is 1:
                    if key is not None:
                        card[key] = value
                    index = line.find(':')
                    key = line[:index].strip().replace(' ','_')
                    value = line[index+1:].strip()
                else:
                    value += line.strip()
            else:
                card[key] = value
                cards.append(card)
                break
            
        self.cards = cards

    def normalize(self):
        # filling field non-existents
        fields = self.get_fields()
        for card in self.cards:
            for field in fields:
                if card.get(field) is None:
                    card[field] = ""

    def remove_fields(self, fields):
        for card in self.cards:
            for field in fields:
                if card.get(field) is not None:
                    card.pop(field)
    
    def get_fields(self):
        fields = set()
        for card in self.cards:
            for field in sorted(card.keys()):
                fields.add(field)
        return fields

    def optimize(self):
        to_keep = set()
        fields = self.get_fields()
        for card in self.cards:
            for field in fields:
                if card.get(field) not in (None, ""):
                    to_keep.add(field)
        to_remove = fields - to_keep
        for field in to_remove:
            for card in self.cards:
                try:
                    card.pop(field)
                except:
                    pass
    
    def create_sqlite_table(self, sqlite_file):
        conn = sqlite3.connect(sqlite_file)
        cursor = conn.cursor()

        cursor.execute("DROP TABLE IF EXISTS cards;")
        fields = sorted(self.get_fields())
        sql = "CREATE TABLE CARDS (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "
        for field in fields:
            sql += field
            sql += ' VARCHAR(80), ' if field != 'text' else ' TEXT, '
        sql = sql[:-2] + ");"

        cursor.execute(sql)
        conn.commit()
        conn.close()
    
    def dump_sqlite_table(self, sqlite_file):
        conn = sqlite3.connect(sqlite_file)
        cursor = conn.cursor()

        fields = sorted(self.get_fields())
        sql = "INSERT INTO cards (" + ', '.join(fields) + ") VALUES ('_*_');"
        try:
            for card in self.cards:
                values = "', '".join( [card[field] for field in fields] )
                _sql = sql.replace('_*_',values)
                cursor.execute(_sql)
        except Exception as e:
            print(_sql)
            print("Erro ao inserir na tabela! Motivo:", e)

        conn.commit()
        conn.close()

Que coincidência! Exatamente o que eu precisava!!!

Oh! Que bom que foi útil para você! Obrigado pela estrelinha!