diff --git a/sql/migration/security_classes_migration.sql b/sql/migration/security_classes_migration.sql
new file mode 100644
index 0000000..8eda84d
--- /dev/null
+++ b/sql/migration/security_classes_migration.sql
@@ -0,0 +1,54 @@
+WITH imported_info_system AS (
+    SELECT
+        DISTINCT ON (inf.lyhinimi)
+                    inf.lyhinimi,
+                    uuid_in(md5(inf.lyhinimi) :: CSTRING) AS inf_uuid,
+                    json_build_object(
+                        'class', substring(inf.tk_kaideldavus_kood, '[^_]*$')
+                                   || substring(inf.tk_terviklus_kood, '[^_]*$')
+                                   || substring(inf.tk_konfidentsiaalsus_kood, '[^_]*$'),
+                        'level', CASE
+                                   WHEN (inf.tk_kaideldavus_kood || inf.tk_terviklus_kood || inf.tk_konfidentsiaalsus_kood) ~ '3' THEN 'H'
+                                   WHEN (inf.tk_kaideldavus_kood || inf.tk_terviklus_kood || inf.tk_konfidentsiaalsus_kood) ~ '2' THEN 'M'
+                                   ELSE 'L'
+                            END,
+                        'standard', 'ISKE',
+                        'latest_audit_date', 'null',
+                        'latest_audit_resolution', 'null') AS security
+    FROM infosysteem inf
+    WHERE inf.kuupaev_kuni IS NULL
+      AND inf.staatus_kood IS DISTINCT FROM 'STAATUS_EI_ASUTATA'
+      AND inf.staatus_kood IS DISTINCT FROM 'INFOSYS_STAATUS_LOPETATUD'
+      AND kategooria IS DISTINCT FROM 'INFOSYSTEEM_KATEGOORIA_ALAMSYSTEEM'
+      AND inf.tk_kaideldavus_kood IS NOT NULL
+      AND inf.tk_konfidentsiaalsus_kood IS NOT NULL
+      AND inf.tk_terviklus_kood IS NOT NULL
+    ORDER BY inf.lyhinimi, inf.created DESC
+    )
+INSERT INTO riha.main_resource(main_resource_id, uri, name, owner, short_name, version, json_content, parent_uri, main_resource_parent_id,
+                                     kind, state, start_date, end_date, creator, modifier, creation_date, modified_date, old_id, field_name, kind_id, main_resource_template_id)
+SELECT
+       nextval('riha.main_resource_seq'),
+       uri,
+       name,
+       owner,
+       short_name,
+       version,
+       jsonb_set(json_content, '{security}', imported_info_system.security :: jsonb),
+       parent_uri,
+       main_resource_parent_id,
+       kind,
+       state,
+       start_date,
+       end_date,
+       creator,
+       modifier,
+       creation_date,
+       modified_date,
+       old_id,
+       field_name,
+       kind_id,
+       main_resource_template_id
+FROM imported_info_system INNER JOIN riha.main_resource_view mrv
+         ON imported_info_system.inf_uuid = (mrv.json_content ->> 'uuid') :: UUID
+WHERE NOT mrv.json_content ? 'security';
\ No newline at end of file