{
	"comment": "Drop change_tag.ct_tag field (T185355)",
	"before": {
		"name": "change_tag",
		"comment": "A table to track tags for revisions, logs and recent changes",
		"columns": [
			{
				"name": "ct_id",
				"type": "integer",
				"options": { "unsigned": true, "notnull": true, "autoincrement": true }
			},
			{
				"name": "ct_rc_id",
				"comment": "RCID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_log_id",
				"comment": "LOGID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_rev_id",
				"comment": "REVID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_tag",
				"comment": "Tag applied, this will go away and be replaced with ct_tag_id",
				"type": "string",
				"options": { "length": 255, "notnull": true, "default": "" }
			},
			{
				"name": "ct_params",
				"comment": "Parameters for the tag; used by some extensions",
				"type": "blob",
				"options": { "length": 65530, "notnull": false, "default": null }
			},
			{
				"name": "ct_tag_id",
				"comment": "Foreign key to change_tag_def row",
				"type": "integer",
				"options": { "unsigned": false, "notnull": true }
			}
		],
		"indexes": [
			{ "name": "change_tag_rc_tag_id", "columns": [ "ct_rc_id", "ct_tag_id" ], "unique": true },
			{ "name": "change_tag_log_tag_id", "columns": [ "ct_log_id", "ct_tag_id" ], "unique": true },
			{ "name": "change_tag_rev_tag_id", "columns": [ "ct_rev_id", "ct_tag_id" ], "unique": true },
			{ "name": "change_tag_rc_tag_nonuniq", "columns": [ "ct_rc_id", "ct_tag" ], "unique": true },
			{ "name": "change_tag_log_tag_nonuniq", "columns": [ "ct_log_id", "ct_tag" ], "unique": true },
			{ "name": "change_tag_rev_tag_nonuniq", "columns": [ "ct_rev_id", "ct_tag" ], "unique": true },
			{
				"name": "change_tag_tag_id",
				"comment": "Covering index, so we can pull all the info only out of the index.",
				"columns": [ "ct_tag", "ct_rc_id", "ct_rev_id", "ct_log_id" ],
				"unique": false
			},
			{
				"name": "change_tag_tag_id_id",
				"comment": "Covering index, so we can pull all the info only out of the index.",
				"columns": [ "ct_tag_id", "ct_rc_id", "ct_rev_id", "ct_log_id" ],
				"unique": false
			}
		],
		"pk": [ "ct_id" ]
	},
	"after": {
		"name": "change_tag",
		"comment": "A table to track tags for revisions, logs and recent changes",
		"columns": [
			{
				"name": "ct_id",
				"type": "integer",
				"options": { "unsigned": true, "notnull": true, "autoincrement": true }
			},
			{
				"name": "ct_rc_id",
				"comment": "RCID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_log_id",
				"comment": "LOGID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_rev_id",
				"comment": "REVID for the change",
				"type": "integer",
				"options": { "unsigned": true, "notnull": false, "default": null }
			},
			{
				"name": "ct_params",
				"comment": "Parameters for the tag; used by some extensions",
				"type": "blob",
				"options": { "length": 65530, "notnull": false, "default": null }
			},
			{
				"name": "ct_tag_id",
				"comment": "Foreign key to change_tag_def row",
				"type": "integer",
				"options": { "unsigned": true, "notnull": true }
			}
		],
		"indexes": [
			{ "name": "change_tag_rc_tag_id", "columns": [ "ct_rc_id", "ct_tag_id" ], "unique": true },
			{ "name": "change_tag_log_tag_id", "columns": [ "ct_log_id", "ct_tag_id" ], "unique": true },
			{ "name": "change_tag_rev_tag_id", "columns": [ "ct_rev_id", "ct_tag_id" ], "unique": true },
			{
				"name": "change_tag_tag_id_id",
				"comment": "Covering index, so we can pull all the info only out of the index.",
				"columns": [ "ct_tag_id", "ct_rc_id", "ct_rev_id", "ct_log_id" ],
				"unique": false
			}
		],
		"pk": [ "ct_id" ]
	}
}