diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf62ed03..ff134d18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -66,3 +66,5 @@
   - Much improved nginx configuration for installation, script does most of the work
   - Fixed settings form asking to save password -.-
   - Multiple files & post flags now shown in catalog view
+  - Faster, more efficient global settings changes
+  - Add option for board owner to prevent OP deleting threads that are too old or have too many replies
diff --git a/configs/template.js.example b/configs/template.js.example
index 02bb6437..a03f27b4 100644
--- a/configs/template.js.example
+++ b/configs/template.js.example
@@ -406,6 +406,8 @@ module.exports = {
 		filters: [], //words/phrases to block
 		filterMode: 0, //0=nothing, 1=prevent post, 2=auto ban
 		filterBanDuration: 0, //duration (in ms) to ban if filter mode=2
+		deleteProtectionAge: 0, //prevent non-staff OP from deleting their thread if it older than this age in ms
+		deleteProtectionCount: 0, //prevent non-staff op deleting their thread if it has more than this many replies
 		strictFiltering: false,
 		announcement: {
 			raw: null,
diff --git a/controllers/forms/boardsettings.js b/controllers/forms/boardsettings.js
index 21570088..6cf8566b 100644
--- a/controllers/forms/boardsettings.js
+++ b/controllers/forms/boardsettings.js
@@ -1,3 +1,4 @@
+
 'use strict';
 
 const changeBoardSettings = require(__dirname+'/../../models/forms/changeboardsettings.js')
@@ -12,12 +13,12 @@ const changeBoardSettings = require(__dirname+'/../../models/forms/changeboardse
 module.exports = {
 
 	paramConverter: paramConverter({
-		timeFields: ['ban_duration'],
+		timeFields: ['ban_duration', 'delete_protection_age'],
 		trimFields: ['filters', 'moderators', 'tags', 'announcement', 'description', 'name', 'custom_css'],
 		allowedArrays: ['countries'],
 		numberFields: ['lock_reset', 'captcha_reset', 'filter_mode', 'lock_mode', 'message_r9k_mode', 'file_r9k_mode', 'captcha_mode', 'tph_trigger', 'pph_trigger', 'pph_trigger_action',
 			'tph_trigger_action', 'bump_limit', 'reply_limit', 'max_files', 'thread_limit', 'max_thread_message_length', 'max_reply_message_length', 'min_thread_message_length',
-			'min_reply_message_length'],
+			'min_reply_message_length', 'delete_protection_count'],
 	}),
 
 	controller: async (req, res, next) => {
@@ -68,6 +69,8 @@ module.exports = {
 			{ result: numberBody(req.body.lock_reset, 0, 2), expected: true, error: 'Invalid trigger reset lock' },
 			{ result: numberBody(req.body.captcha_reset, 0, 2), expected: true, error: 'Invalid trigger reset captcha' },
 			{ result: numberBody(req.body.ban_duration, 0), expected: true, error: 'Invalid filter auto ban duration' },
+			{ result: numberBody(req.body.delete_protection_age, 0), expected: true, error: 'Invalid OP thread age delete protection' },
+			{ result: numberBody(req.body.delete_protection_count, 0), expected: true, error: 'Invalid OP thread reply count delete protection' },
 			{ result: inArrayBody(req.body.theme, themes), expected: true, error: 'Invalid theme' },
 			{ result: inArrayBody(req.body.code_theme, codeThemes), expected: true, error: 'Invalid code theme' },
 		], res.locals.permLevel);
diff --git a/migrations/0.1.8.js b/migrations/0.1.8.js
new file mode 100644
index 00000000..25329e09
--- /dev/null
+++ b/migrations/0.1.8.js
@@ -0,0 +1,14 @@
+'use strict';
+
+module.exports = async(db, redis) => {
+	console.log('Adding OP delete protection options to board settings');
+	await db.collection('boards').updateMany({}, {
+		'$set': {
+			'settings.deleteProtectionAge': 0,
+			'settings.deleteProtectionCount': 0,
+		}
+	});
+	console.log('Clearing boards cache');
+	await redis.deletePattern('board:*');
+
+};
diff --git a/models/forms/actionhandler.js b/models/forms/actionhandler.js
index d301aa16..cbaa3e45 100644
--- a/models/forms/actionhandler.js
+++ b/models/forms/actionhandler.js
@@ -56,7 +56,7 @@ module.exports = async (req, res, next) => {
 				redirect,
 			});
 		}
-		res.locals.posts = passwordPosts
+		res.locals.posts = passwordPosts;
 	}
 
 	//affected boards, list and page numbers
@@ -96,6 +96,26 @@ module.exports = async (req, res, next) => {
 		messages.push(message);
 	}
 	if (deleting) {
+		if (res.locals.permLevel >= 4) {
+			//delete protection. this could only be single board actions obvously with permLevel >=4
+			const { deleteProtectionAge, deleteProtectionCount } = threadBoards[res.locals.posts[0].board].settings;
+			if (deleteProtectionAge > 0 || deleteProtectionCount > 0) {
+				const protectedThread = res.locals.posts.some(p => {
+					return p.thread === null //is a thread
+						&& ((deleteProtectionCount > 0 && p.replyposts > deleteProtectionCount) //and it has more replies than the protection count
+							|| (deleteProtectionAge > 0 && new Date(p.date + deleteProtectionAge) > new Date())); //or was created too recently
+				});
+				if (protectedThread != null) {
+					//alternatively, the above .some() could become a filter like some other options and silently not delete,
+					//but i think in this case it would be important to notify the user that their own thread(s) cant be deleted yet
+					return dynamicResponse(req, res, 403, 'message', {
+						'title': 'Forbidden',
+						'error': 'You cannot delete old threads or threads with too many replies',
+						redirect,
+					});
+				}
+			}
+		}
 		const postsBefore = res.locals.posts.length;
 		if (req.body.delete_ip_board || req.body.delete_ip_global || req.body.delete_ip_thread) {
 			const deletePostIps = res.locals.posts.map(x => x.ip.single);
diff --git a/models/forms/changeboardsettings.js b/models/forms/changeboardsettings.js
index 5155d485..b02637fa 100644
--- a/models/forms/changeboardsettings.js
+++ b/models/forms/changeboardsettings.js
@@ -122,6 +122,8 @@ module.exports = async (req, res, next) => {
 		'fileR9KMode': numberSetting(req.body.file_r9k_mode, oldSettings.fileR9KMode),
 		'filterMode': numberSetting(req.body.filter_mode, oldSettings.filterMode),
 		'filterBanDuration': numberSetting(req.body.ban_duration, oldSettings.filterBanDuration),
+		'deleteProtectionAge': numberSetting(req.body.delete_protection_age, oldSettings.deleteProtectionAge),
+		'deleteProtectionCount': numberSetting(req.body.delete_protection_count, oldSettings.deleteProtectionCount),
 		'filters': arraySetting(req.body.filters, oldSettings.filters, 50),
 		'blockedCountries': req.body.countries || [],
 		'disableAnonymizerFilePosting': booleanSetting(req.body.disable_anonymizer_file_posting),
diff --git a/package.json b/package.json
index 3b5d0040..c86fb75a 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "jschan",
   "version": "0.1.8",
-  "migrateVersion": "0.1.6",
+  "migrateVersion": "0.1.8",
   "description": "",
   "main": "server.js",
   "dependencies": {
diff --git a/views/pages/managesettings.pug b/views/pages/managesettings.pug
index 246bc9d7..dae52ced 100644
--- a/views/pages/managesettings.pug
+++ b/views/pages/managesettings.pug
@@ -212,6 +212,12 @@ block content
 							option(value='0', selected=board.settings.messageR9KMode === 0) Off
 							option(value='1', selected=board.settings.messageR9KMode === 1) Per Thread
 							option(value='2', selected=board.settings.messageR9KMode === 2) Board Wide
+					.row
+						.label OP Reply Count Delete Protection
+						input(type='number' name='delete_protection_count' value=board.settings.deleteProtectionCount)
+					.row
+						.label OP Thread Age Delete Protection
+						input(type='text' name='delete_protection_age' placeholder='e.g. 1w' value=board.settings.deleteProtectionAge)
 				.col.w900
 					.row
 						h4.mv-5 Antispam