bug fixes on activity log and array_key_first alt using reset

common-fixes.md

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+# Inability to insert emojis into DB tables
+
+Step 1, change your database's default charset:
+
+ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
+if the db is not created yet, create it with correct encodings:
+
+CREATE DATABASE database_name DEFAULT CHARSET = utf8mb4 DEFAULT COLLATE = utf8mb4_unicode_ci;
+Step 2, set charset when creating table:
+
+CREATE TABLE IF NOT EXISTS table_name (
+...
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE utf8mb4_unicode_ci;
+or alter table
+
+ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+ALTER TABLE table_name MODIFY field_name TEXT CHARSET utf8mb4;
+
+### Source 
+- https://stackoverflow.com/questions/39463134/how-to-store-emoji-character-in-mysql-database