id - Unique identifier that is mostly an implementation detail (best to ignore). To uniquely identify content, it's best to use author/permlink.
author - The author account name of the content.
permlink - Permanent link of the content, must be unique in the scope of the author.
category - The main category/tag this content belongs to.
root_author - Used in conbination with root_permlink.
root_permlink - In conbination with root_author, distinctly references discussion this content is part of.
parent_author - Parent author, in case this content is a comment (reply).
parent_permlink - Parent permanent link, this will be the same as category for posts and will contain the permlink of the content being replied to in the case of a comment.
title - Title of the content.
body - Body of the content.
json_metadata - JSON metadata that holds extra information about the content. Note: The format for this field is not guaranteed to be valid JSON.
last_update - The date and time of the last update to this content.
created - The date and time this content was created.
active - The last time this content was "touched" by voting or reply.
last_payout - Time of last payout.
depth - Used to track max nested depth.
children - Used to track the total number of children, grandchildren, etc. ...
net_rshares - Reward is proportional to liniar rshares, this is the sum of all votes (positive and negative reward sum)
abs_rshares - This was used to track the total absolute weight of votes for the purpose of calculating cashout_time.
vote_rshares - Total positive rshares from all votes. Used to calculate delta weights. Needed to handle vote changing and removal.
children_abs_rshares - This was used to calculate cashout time of a discussion.
cashout_time - 7 days from the created date.
max_cashout_time - Unused.
total_vote_weight - The total weight of voting rewards, used to calculate pro-rata share of curation payouts.
reward_weight - Weight/percent of reward.
total_payout_value - Tracks the total payout this content has received over time, measured in the debt asset.
curator_payout_value - Tracks the curator payout this content has received over time, measured in the debt asset.
author_rewards - Tracks the author payout this content has received over time, measured in the debt asset.
net_votes - Net positive votes
root_comment - ID of the original content.
max_accepted_payout - Value of the maximum payout this content will receive.
percent_hbd - The percent of Hive Dollars to key, unkept amounts will be received as HIVE Power.
allow_replies - Allows content to disable replies.
allow_votes - Allows content to receive votes.
allow_curation_rewards - Allows curators of this content receive rewards.
beneficiaries - The list of up to 8 beneficiary accounts for this content as well as the percentage of the author reward they will receive in HIVE Power.
url - The end of the url to this content.
root_title - Title of the original content (useful in replies).
pending_payout_value - Pending payout amount if 7 days has not yet elapsed.
total_pending_payout_value - Total pending payout amount if 7 days has not yet elapsed.
active_votes - The entire voting list array, including upvotes, downvotes, and unvotes; used to calculate net_votes.
replies - Unused.
author_reputation - Author's reputation.
promoted - If post is promoted, how much has been spent on promotion.
body_length - Total content length.
reblogged_by - Unused.