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My cursory solution uses mongodb and rospy_message_converter, seems easy so far but I haven't actually gotten to the stage of loading gigabytes of data and experiencing how well it performs:

from pymongo import MongoClient
from rospy_message_converter import message_converter

# connect to mongodb, get/create a collection
...
# get messages out of bag
...
msg_dict = message_converter.convert_ros_message_to_dictionary(msg)
collection.insert(msg_dict)

I haven't used mongodb_store at all, if I run into problems I'll investigate if they are already solved there.

There will be some nuances with inserting images in a way that other tools can view, converting the stamps to a datetime (which should make time filtering easy), storing topic names in a useful way. Messages larger than 16MB require gridfs.