It works :)

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/clojure,emacs
+# Edit at https://www.toptal.com/developers/gitignore?templates=clojure,emacs
+
+### Clojure ###
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/lib/
+/classes/
+/target/
+/checkouts/
+.lein-deps-sum
+.lein-repl-history
+.lein-plugins/
+.lein-failures
+.nrepl-port
+.cpcache/
+
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+
+# directory configuration
+.dir-locals.el
+
+# network security
+/network-security.data
+
+
+# End of https://www.toptal.com/developers/gitignore/api/clojure,emacs

bb.edn

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+{:paths ["."]}

memento.clj

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+(ns memento
+  (:require [cheshire.core :as json]
+            [org.httpkit.client :as http]
+            [clojure.string :as str])
+  (:import [java.time LocalDateTime Instant ZoneId Duration]
+           [java.net URLEncoder]))
+
+(def acct (System/getenv "MASTODON_ACCOUNT"))
+(def auth-token (System/getenv "MASTODON_AUTH_TOKEN"))
+
+(def assert-msg "Please set the MASTODON_ACCOUNT, MASTODON_AUTH_TOKEN and MEMENTO_ACCOUNT env vars.")
+(assert (not (empty? acct)) assert-msg)
+(assert (not (empty? auth-token)) assert-msg)
+
+(def instance-url (format "https://%s" (last (str/split acct #"@"))))
+
+(defn mastodon-api [path params]
+  (->
+    @(http/request
+       (merge-with
+         #(if (map? %1) (merge %1 %2) %2)
+         {:url (format "%s/%s" instance-url path)
+          :method :get
+          :headers {"Authorization" (format "Bearer %s" auth-token)}}
+         params))
+    (update :body #(json/parse-string % true))))
+
+(defn prn-res [res]
+  (prn (assoc-in res [:opts :headers "Authorization"] "Bearer XXX")))
+
+(println "Requesting account details for" acct)
+
+(def account-details
+  (mastodon-api "api/v1/accounts/lookup" {:query-params {:acct acct}}))
+
+(prn-res account-details)
+
+(def cutoff (.. (Instant/now) (minus (Duration/ofDays 1))))
+
+(println "cutoff" cutoff)
+
+(def delete-xf
+  (comp (filter #(. (Instant/parse (:created_at %)) isBefore cutoff))
+        (remove #(= (:visibility %) "direct"))))
+
+(def to-delete
+  (->
+    (mastodon-api (format "api/v1/accounts/%s/statuses" (-> account-details :body :id))
+                  {:query-params {:tagged "today"
+                                  :exclude_reblogs true}})
+    (update :body #(into [] delete-xf %))))
+
+(defn sleep [ms]
+  (future (Thread/sleep ms)))
+
+(doseq [status (:body to-delete)]
+  (try
+    (print "Deleting post ")
+    (prn (select-keys status [:created_at :url]))
+    (let [deleted (mastodon-api (format "api/v1/statuses/%s" (:id status)) {:method :delete})]
+      (print "Deleted ")
+      (prn-res deleted)
+      @(sleep 2500) ; we need to wait, otherwise media_ids are still "attached" and can't be reused
+      (print "Recreating ")
+      (prn-res (mastodon-api
+                 (format "api/v1/statuses" #_(:id refiled))
+                 {:method :post
+                  :headers {"Content-Type" "application/json"}
+                  :body (json/encode
+                          {:visibility "direct"
+                           :media_ids (map :id (-> deleted :body :media_attachments))
+                           :status (-> deleted :body :text)})})))
+      (catch Exception e
+        (println "Error deleting " (:url status))
+        (throw e))))
+