{
	"before": {
		"name": "revision",
		"comment": "Every edit of a page creates also a revision row. This stores metadata about the revision, and a reference to the text storage backend.",
		"columns": [
			{
				"name": "rev_id",
				"comment": "Unique ID to identify each revision",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true,
					"autoincrement": true
				}
			},
			{
				"name": "rev_page",
				"comment": "Key to page_id. This should never be invalid",
				"type": "integer",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_comment_id",
				"comment": "Key to comment.comment_id. Comment summarizing the change",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_actor",
				"comment": "Key to actor.actor_id of the user or IP who made this edit",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_timestamp",
				"comment": "Timestamp of when revision was created",
				"type": "mwtimestamp",
				"options": {
					"notnull": true
				}
			},
			{
				"name": "rev_minor_edit",
				"comment": "Records whether the user marked the 'minor edit' checkbox. Many automated edits are marked as minor",
				"type": "mwtinyint",
				"options": {
					"notnull": true,
					"unsigned": true,
					"default": 0
				}
			},
			{
				"name": "rev_deleted",
				"comment": "Restrictions on who can access this revision",
				"type": "mwtinyint",
				"options": {
					"notnull": true,
					"unsigned": true,
					"default": 0
				}
			},
			{
				"name": "rev_len",
				"comment": "Length of this revision in bytes",
				"type": "integer",
				"options": {
					"unsigned": true,
					"notnull": false
				}
			},
			{
				"name": "rev_parent_id",
				"comment": "Key to revision.rev_id. This field is used to add support for a tree structure (The Adjacency List Model)",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": false
				}
			},
			{
				"name": "rev_sha1",
				"comment": "SHA-1 text content hash in base-36",
				"type": "binary",
				"options": {
					"length": 32,
					"notnull": true,
					"default": ""
				}
			}
		],
		"indexes": [
			{
				"name": "rev_timestamp",
				"columns": [
					"rev_timestamp"
				],
				"comment": "Used by ApiQueryAllRevisions",
				"unique": false
			},
			{
				"name": "rev_page_timestamp",
				"columns": [
					"rev_page",
					"rev_timestamp"
				],
				"comment": "History index",
				"unique": false
			},
			{
				"name": "rev_actor_timestamp",
				"columns": [
					"rev_actor",
					"rev_timestamp",
					"rev_id"
				],
				"comment": "User contributions index",
				"unique": false
			},
			{
				"name": "rev_page_actor_timestamp",
				"columns": [
					"rev_page",
					"rev_actor",
					"rev_timestamp"
				],
				"comment": "Credits index. This is scanned in order to compile credits lists for pages, in ApiQueryContributors. Also for ApiQueryRevisions if rvuser is specified",
				"unique": false
			}
		],
		"pk": [
			"rev_id"
		]
	},
	"after": {
		"name": "revision",
		"comment": "Every edit of a page creates also a revision row. This stores metadata about the revision, and a reference to the text storage backend.",
		"columns": [
			{
				"name": "rev_id",
				"comment": "Unique ID to identify each revision",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true,
					"autoincrement": true
				}
			},
			{
				"name": "rev_page",
				"comment": "Key to page_id. This should never be invalid",
				"type": "integer",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_comment_id",
				"comment": "Key to comment.comment_id. Comment summarizing the change",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_actor",
				"comment": "Key to actor.actor_id of the user or IP who made this edit",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": true
				}
			},
			{
				"name": "rev_timestamp",
				"comment": "Timestamp of when revision was created",
				"type": "mwtimestamp",
				"options": {
					"notnull": true
				}
			},
			{
				"name": "rev_minor_edit",
				"comment": "Records whether the user marked the 'minor edit' checkbox. Many automated edits are marked as minor",
				"type": "mwtinyint",
				"options": {
					"notnull": true,
					"unsigned": true,
					"default": 0
				}
			},
			{
				"name": "rev_deleted",
				"comment": "Restrictions on who can access this revision",
				"type": "mwtinyint",
				"options": {
					"notnull": true,
					"unsigned": true,
					"default": 0
				}
			},
			{
				"name": "rev_len",
				"comment": "Length of this revision in bytes",
				"type": "integer",
				"options": {
					"unsigned": true,
					"notnull": false
				}
			},
			{
				"name": "rev_parent_id",
				"comment": "Key to revision.rev_id. This field is used to add support for a tree structure (The Adjacency List Model)",
				"type": "bigint",
				"options": {
					"unsigned": true,
					"notnull": false
				}
			}
		],
		"indexes": [
			{
				"name": "rev_timestamp",
				"columns": [
					"rev_timestamp"
				],
				"comment": "Used by ApiQueryAllRevisions",
				"unique": false
			},
			{
				"name": "rev_page_timestamp",
				"columns": [
					"rev_page",
					"rev_timestamp"
				],
				"comment": "History index",
				"unique": false
			},
			{
				"name": "rev_actor_timestamp",
				"columns": [
					"rev_actor",
					"rev_timestamp",
					"rev_id"
				],
				"comment": "User contributions index",
				"unique": false
			},
			{
				"name": "rev_page_actor_timestamp",
				"columns": [
					"rev_page",
					"rev_actor",
					"rev_timestamp"
				],
				"comment": "Credits index. This is scanned in order to compile credits lists for pages, in ApiQueryContributors. Also for ApiQueryRevisions if rvuser is specified",
				"unique": false
			}
		],
		"pk": [
			"rev_id"
		]
	}
}