diff --git a/Gemfile b/Gemfile
index 647aefea8ad..521ef33e822 100644
--- a/Gemfile
+++ b/Gemfile
@@ -259,6 +259,11 @@ if ENV["IMPORT"] == "1"
   gem "parallel", require: false
 end
 
+if ENV["GENERIC_IMPORT"] == "1"
+  gem "sqlite3"
+  gem "redcarpet"
+end
+
 gem "web-push"
 gem "colored2", require: false
 gem "maxminddb"
diff --git a/script/bulk_import/base.rb b/script/bulk_import/base.rb
index d92878b705b..1f78e54d258 100644
--- a/script/bulk_import/base.rb
+++ b/script/bulk_import/base.rb
@@ -130,7 +130,7 @@ class BulkImport::Base
   end
 
   def imported_ids(name)
-    map = []
+    map = {}
     ids = []
 
     @raw_connection.send_query(
@@ -202,8 +202,9 @@ class BulkImport::Base
     puts "Loading users indexes..."
     @last_user_id = last_id(User)
     @last_user_email_id = last_id(UserEmail)
-    @emails =
-      User.unscoped.joins(:user_emails).pluck(:"user_emails.email", :"user_emails.user_id").to_h
+    @last_sso_record_id = last_id(SingleSignOnRecord)
+    @emails = UserEmail.pluck(:email, :user_id).to_h
+    @external_ids = SingleSignOnRecord.pluck(:external_id, :user_id).to_h
     @usernames_lower = User.unscoped.pluck(:username_lower).to_set
     @mapped_usernames =
       UserCustomField
@@ -214,6 +215,7 @@ class BulkImport::Base
 
     puts "Loading categories indexes..."
     @last_category_id = last_id(Category)
+    @highest_category_position = Category.unscoped.maximum(:position) || 0
     @category_names =
       Category
         .unscoped
@@ -256,6 +258,11 @@ class BulkImport::Base
     if @last_user_email_id > 0
       @raw_connection.exec("SELECT setval('#{UserEmail.sequence_name}', #{@last_user_email_id})")
     end
+    if @last_sso_record_id > 0
+      @raw_connection.exec(
+        "SELECT setval('#{SingleSignOnRecord.sequence_name}', #{@last_sso_record_id})",
+      )
+    end
     if @last_category_id > 0
       @raw_connection.exec("SELECT setval('#{Category.sequence_name}', #{@last_category_id})")
     end
@@ -344,6 +351,21 @@ class BulkImport::Base
 
   USER_PROFILE_COLUMNS ||= %i[user_id location website bio_raw bio_cooked views]
 
+  USER_SSO_RECORD_COLUMNS ||= %i[
+    id
+    user_id
+    external_id
+    last_payload
+    created_at
+    updated_at
+    external_username
+    external_email
+    external_name
+    external_avatar_url
+    external_profile_background_url
+    external_card_background_url
+  ]
+
   GROUP_USER_COLUMNS ||= %i[group_id user_id created_at updated_at]
 
   CATEGORY_COLUMNS ||= %i[
@@ -442,6 +464,9 @@ class BulkImport::Base
   def create_user_profiles(rows, &block)
     create_records(rows, "user_profile", USER_PROFILE_COLUMNS, &block)
   end
+  def create_single_sign_on_records(rows, &block)
+    create_records(rows, "single_sign_on_record", USER_SSO_RECORD_COLUMNS, &block)
+  end
   def create_group_users(rows, &block)
     create_records(rows, "group_user", GROUP_USER_COLUMNS, &block)
   end
@@ -495,6 +520,15 @@ class BulkImport::Base
       end
     end
 
+    if user[:external_id].present?
+      if existing_user_id = @external_ids[user[:external_id]]
+        @pre_existing_user_ids << existing_user_id
+        @users[user[:imported_id].to_i] = existing_user_id
+        user[:skip] = true
+        return user
+      end
+    end
+
     @users[user[:imported_id].to_i] = user[:id] = @last_user_id += 1
 
     imported_username = user[:username].dup
@@ -521,6 +555,9 @@ class BulkImport::Base
     user[:last_emailed_at] ||= NOW
     user[:created_at] ||= NOW
     user[:updated_at] ||= user[:created_at]
+    user[:suspended_at] ||= user[:suspended_at]
+    user[:suspended_till] ||= user[:suspended_till] ||
+      (200.years.from_now if user[:suspended_at].present?)
 
     if (date_of_birth = user[:date_of_birth]).is_a?(Date) && date_of_birth.year != 1904
       user[:date_of_birth] = Date.new(1904, date_of_birth.month, date_of_birth.day)
@@ -539,8 +576,7 @@ class BulkImport::Base
     user_email[:created_at] ||= NOW
     user_email[:updated_at] ||= user_email[:created_at]
 
-    user_email[:email] ||= random_email
-    user_email[:email].downcase!
+    user_email[:email] = user_email[:email]&.downcase || random_email
     # unique email
     user_email[:email] = random_email until EmailAddressValidator.valid_value?(
       user_email[:email],
@@ -577,6 +613,18 @@ class BulkImport::Base
     user_profile
   end
 
+  def process_single_sign_on_record(sso_record)
+    user_id = @users[sso_record[:imported_user_id].to_i]
+    return { skip: true } if @pre_existing_user_ids.include?(user_id)
+
+    sso_record[:id] = @last_sso_record_id += 1
+    sso_record[:user_id] = user_id
+    sso_record[:last_payload] ||= ""
+    sso_record[:created_at] = NOW
+    sso_record[:updated_at] = NOW
+    sso_record
+  end
+
   def process_group_user(group_user)
     group_user[:created_at] = NOW
     group_user[:updated_at] = NOW
@@ -584,6 +632,12 @@ class BulkImport::Base
   end
 
   def process_category(category)
+    if category[:existing_id].present?
+      @categories[category[:imported_id].to_i] = category[:existing_id]
+      category[:skip] = true
+      return category
+    end
+
     category[:id] ||= @last_category_id += 1
     @categories[category[:imported_id].to_i] ||= category[:id]
     category[:name] = category[:name][0...50].scrub.strip
@@ -594,6 +648,14 @@ class BulkImport::Base
     category[:user_id] ||= Discourse::SYSTEM_USER_ID
     category[:created_at] ||= NOW
     category[:updated_at] ||= category[:created_at]
+
+    if category[:position]
+      @highest_category_position = category[:position] if category[:position] >
+        @highest_category_position
+    else
+      category[:position] = @highest_category_position += 1
+    end
+
     category
   end
 
@@ -633,6 +695,7 @@ class BulkImport::Base
         post[:raw]
       end
     end
+    post[:raw] = normalize_text(post[:raw])
     post[:like_count] ||= 0
     post[:cooked] = pre_cook post[:raw]
     post[:hidden] ||= false
@@ -875,7 +938,7 @@ class BulkImport::Base
   end
 
   def fix_name(name)
-    name.scrub! if name.valid_encoding? == false
+    name.scrub! if name && !name.valid_encoding?
     return if name.blank?
     name = ActiveSupport::Inflector.transliterate(name)
     name.gsub!(/[^\w.-]+/, "_")
diff --git a/script/bulk_import/generic_bulk.rb b/script/bulk_import/generic_bulk.rb
new file mode 100644
index 00000000000..08ef615e73c
--- /dev/null
+++ b/script/bulk_import/generic_bulk.rb
@@ -0,0 +1,367 @@
+# frozen_string_literal: true
+
+require_relative "base"
+require "sqlite3"
+require "json"
+
+class BulkImport::Generic < BulkImport::Base
+  AVATAR_DIRECTORY = ENV["AVATAR_DIRECTORY"]
+  UPLOAD_DIRECTORY = ENV["UPLOAD_DIRECTORY"]
+
+  def initialize(db_path)
+    super()
+    @db = create_connection(db_path)
+  end
+
+  def start
+    run # will call execute, and then "complete" the migration
+
+    # Now that the migration is complete, do some more work:
+
+    Discourse::Application.load_tasks
+
+    puts "running 'import:ensure_consistency' rake task."
+    Rake::Task["import:ensure_consistency"].invoke
+  end
+
+  def execute
+    import_categories
+    import_users
+    import_user_emails
+    import_single_sign_on_records
+    import_topics
+    import_posts
+    import_topic_allowed_users
+    import_likes
+    import_user_stats
+    import_tags
+  end
+
+  def import_categories
+    puts "Importing categories..."
+
+    categories = query(<<~SQL)
+      WITH RECURSIVE tree(id, parent_category_id, name, description, color, text_color, read_restricted, slug,
+                          old_relative_url, existing_id, level, rowid) AS (
+          SELECT c.id, c.parent_category_id, c.name, c.description, c.color, c.text_color, c.read_restricted, c.slug,
+                 c.old_relative_url, c.existing_id, 0 AS level, c.ROWID
+          FROM categories c
+          WHERE c.parent_category_id IS NULL
+          UNION
+          SELECT c.id, c.parent_category_id, c.name, c.description, c.color, c.text_color, c.read_restricted, c.slug,
+                 c.old_relative_url, c.existing_id, tree.level + 1 AS level, c.ROWID
+          FROM categories c,
+               tree
+          WHERE c.parent_category_id = tree.id
+      )
+      SELECT *
+      FROM tree
+      ORDER BY level, rowid
+    SQL
+
+    create_categories(categories) do |row|
+      {
+        imported_id: row["id"],
+        existing_id: row["existing_id"],
+        name: row["name"],
+        description: row["description"],
+        parent_category_id:
+          row["parent_category_id"] ? category_id_from_imported_id(row["parent_category_id"]) : nil,
+        slug: row["slug"],
+      }
+    end
+  end
+
+  def import_users
+    puts "Importing users..."
+
+    users = query(<<~SQL)
+      SELECT ROWID, *
+      FROM users
+      ORDER BY ROWID
+    SQL
+
+    create_users(users) do |row|
+      sso_record = JSON.parse(row["sso_record"]) if row["sso_record"].present?
+
+      if row["suspension"].present?
+        suspension = JSON.parse(row["suspension"])
+        suspended_at = suspension["suspended_at"]
+        suspended_till = suspension["suspended_till"]
+      end
+
+      {
+        imported_id: row["id"],
+        username: row["username"],
+        name: row["name"],
+        email: row["email"],
+        external_id: sso_record&.fetch("external_id"),
+        created_at: to_datetime(row["created_at"]),
+        admin: row["admin"],
+        moderator: row["moderator"],
+        suspended_at: suspended_at,
+        suspended_till: suspended_till,
+      }
+    end
+  end
+
+  def import_user_emails
+    puts "", "Importing user emails..."
+
+    users = query(<<~SQL)
+      SELECT ROWID, id, email, created_at
+      FROM users
+      ORDER BY ROWID
+    SQL
+
+    create_user_emails(users) do |row|
+      {
+        # FIXME: using both "imported_id" and "imported_user_id" and should be replaced by just "imported_id"
+        imported_id: row["id"],
+        imported_user_id: row["id"],
+        email: row["email"],
+        created_at: to_datetime(row["created_at"]),
+      }
+    end
+  end
+
+  def import_single_sign_on_records
+    puts "", "Importing SSO records..."
+
+    users = query(<<~SQL)
+      SELECT ROWID, id, sso_record
+      FROM users
+      WHERE sso_record IS NOT NULL
+      ORDER BY ROWID
+    SQL
+
+    create_single_sign_on_records(users) do |row|
+      sso_record = JSON.parse(row["sso_record"], symbolize_names: true)
+      # FIXME: using both "imported_id" and "imported_user_id" and should be replaced by just "imported_id"
+      sso_record[:imported_id] = row["id"]
+      sso_record[:imported_user_id] = row["id"]
+      sso_record
+    end
+  end
+
+  def import_topics
+    puts "Importing topics..."
+
+    topics = query(<<~SQL)
+      SELECT ROWID, *
+      FROM topics
+      ORDER BY ROWID
+    SQL
+
+    create_topics(topics) do |row|
+      {
+        archetype: row["private_message"] ? Archetype.private_message : Archetype.default,
+        imported_id: row["id"],
+        title: row["title"],
+        user_id: user_id_from_imported_id(row["user_id"]),
+        created_at: to_datetime(row["created_at"]),
+        category_id: category_id_from_imported_id(row["category_id"]),
+        closed: to_boolean(row["closed"]),
+        views: row["views"],
+      }
+    end
+  end
+
+  def import_topic_allowed_users
+    puts "Importing topic_allowed_users..."
+
+    topics = query(<<~SQL)
+      SELECT ROWID, *
+      FROM topics
+      WHERE private_message IS NOT NULL
+      ORDER BY ROWID
+    SQL
+
+    added = 0
+
+    create_topic_allowed_users(topics) do |row|
+      next unless topic_id = topic_id_from_imported_id(row["id"])
+      imported_user_id = JSON.parse(row["private_message"])["user_ids"].first
+      user_id = user_id_from_imported_id(imported_user_id)
+      added += 1
+      {
+        # FIXME: missing imported_id
+        topic_id: topic_id,
+        user_id: user_id,
+      }
+    end
+
+    puts "", "Added #{added} topic_allowed_users records."
+  end
+
+  def import_posts
+    puts "Importing posts..."
+
+    posts = query(<<~SQL)
+      SELECT ROWID, *
+      FROM posts
+      ORDER BY topic_id, post_number
+    SQL
+
+    create_posts(posts) do |row|
+      next if row["raw"].blank?
+      next unless topic_id = topic_id_from_imported_id(row["topic_id"])
+
+      {
+        imported_id: row["id"],
+        topic_id: topic_id,
+        user_id: user_id_from_imported_id(row["user_id"]),
+        created_at: to_datetime(row["created_at"]),
+        raw: row["raw"],
+        like_count: row["like_count"],
+      }
+    end
+  end
+
+  def import_likes
+    puts "Importing likes..."
+
+    @imported_likes = Set.new
+
+    likes = query(<<~SQL)
+      SELECT ROWID, *
+      FROM likes
+      ORDER BY ROWID
+    SQL
+
+    create_post_actions(likes) do |row|
+      post_id = post_id_from_imported_id(row["post_id"])
+      user_id = user_id_from_imported_id(row["user_id"])
+
+      next if post_id.nil? || user_id.nil?
+      next if @imported_likes.add?([post_id, user_id]).nil?
+
+      {
+        # FIXME: missing imported_id
+        post_id: post_id_from_imported_id(row["post_id"]),
+        user_id: user_id_from_imported_id(row["user_id"]),
+        post_action_type_id: 2,
+        created_at: to_datetime(row["created_at"]),
+      }
+    end
+  end
+
+  def import_user_stats
+    puts "Importing user stats..."
+
+    users = query(<<~SQL)
+      WITH posts_counts AS (
+        SELECT COUNT(p.id) AS count, p.user_id
+        FROM posts p GROUP BY p.user_id
+      ),
+      topic_counts AS (
+        SELECT COUNT(t.id) AS count, t.user_id
+        FROM topics t GROUP BY t.user_id
+      ),
+      first_post AS (
+        SELECT MIN(p.created_at) AS created_at, p.user_id
+        FROM posts p GROUP BY p.user_id ORDER BY p.created_at ASC
+      )
+      SELECT u.id AS user_id, u.created_at, pc.count AS posts, tc.count AS topics, fp.created_at AS first_post
+      FROM users u
+      JOIN posts_counts pc ON u.id = pc.user_id
+      JOIN topic_counts tc ON u.id = tc.user_id
+      JOIN first_post fp ON u.id = fp.user_id
+    SQL
+
+    create_user_stats(users) do |row|
+      user = {
+        imported_id: row["user_id"],
+        imported_user_id: row["user_id"],
+        new_since: to_datetime(row["created_at"]),
+        post_count: row["posts"],
+        topic_count: row["topics"],
+        first_post_created_at: to_datetime(row["first_post"]),
+      }
+
+      likes_received = @db.execute(<<~SQL)
+        SELECT COUNT(l.id) AS likes_received
+        FROM likes l JOIN posts p ON l.post_id = p.id
+        WHERE p.user_id = #{row["user_id"]}
+      SQL
+
+      user[:likes_received] = row["likes_received"] if likes_received
+
+      likes_given = @db.execute(<<~SQL)
+        SELECT COUNT(l.id) AS likes_given
+        FROM likes l
+        WHERE l.user_id = #{row["user_id"]}
+      SQL
+
+      user[:likes_given] = row["likes_given"] if likes_given
+
+      user
+    end
+  end
+
+  def import_tags
+    puts "", "Importing tags..."
+
+    tags =
+      query("SELECT id as topic_id, tags FROM topics")
+        .map do |r|
+          next unless r["tags"]
+          [r["topic_id"], JSON.parse(r["tags"]).uniq]
+        end
+        .compact
+
+    tag_mapping = {}
+
+    tags
+      .map(&:last)
+      .flatten
+      .compact
+      .uniq
+      .each do |tag_name|
+        cleaned_tag_name = DiscourseTagging.clean_tag(tag_name)
+        tag = Tag.find_by_name(cleaned_tag_name) || Tag.create!(name: cleaned_tag_name)
+        tag_mapping[tag_name] = tag.id
+      end
+
+    tags_disaggregated =
+      tags
+        .map do |topic_id, tags_of_topic|
+          tags_of_topic.map { |t| { topic_id: topic_id, tag_id: tag_mapping.fetch(t) } }
+        end
+        .flatten
+
+    create_topic_tags(tags_disaggregated) do |row|
+      next unless topic_id = topic_id_from_imported_id(row[:topic_id])
+
+      { topic_id: topic_id, tag_id: row[:tag_id] }
+    end
+  end
+
+  def create_connection(path)
+    sqlite = SQLite3::Database.new(path, results_as_hash: true)
+    sqlite.busy_timeout = 60_000 # 60 seconds
+    sqlite.auto_vacuum = "full"
+    sqlite.foreign_keys = true
+    sqlite.journal_mode = "wal"
+    sqlite.synchronous = "normal"
+    sqlite
+  end
+
+  def query(sql)
+    @db.prepare(sql).execute
+  end
+
+  def to_date(text)
+    text.present? ? Date.parse(text) : nil
+  end
+
+  def to_datetime(text)
+    text.present? ? DateTime.parse(text) : nil
+  end
+
+  def to_boolean(value)
+    value == 1
+  end
+end
+
+BulkImport::Generic.new(ARGV.first).start