go install github.com/ariarijp/retag@latest

export REDASH_API_KEY="" # You can only use Admin user's API Key when you want to use import command.
export REDASH_URL="http://localhost:5000" # Without trailing slash

retag export --url $REDASH_URL --api-key $REDASH_API_KEY > example.yml
cat example.yml
queries:
  - id: 1
    name: Query 1
    tags: []
  - id: 2
    name: Query 2
    tags: [foo, bar]
  - id: 3
    name: Query 3
    tags: [baz]

retag diff --url $REDASH_URL --api-key $REDASH_API_KEY --yaml example.yml
 queries:
   - id: 1
     name: Query 1
-    tags: []
+    tags: [foo, bar, baz]
   - id: 2
-    name: Query 2
+    name: Great Query
     tags: [foo, bar]
   - id: 3
-    name: Query 3
-    tags: [baz]
+    name: Awesome Query
+    tags: [bar, baz]

retag import --url $REDASH_URL --api-key $REDASH_API_KEY --yaml example.yml # Dry run
DRYRUN: Query #1 will be updated.
DRYRUN: Query #2 will be updated.
DRYRUN: Query #3 will be updated.

retag import --url $REDASH_URL --api-key $REDASH_API_KEY --yaml example.yml --dry-run=false
RESULT: Query #1 updated.
RESULT: Query #2 updated.
RESULT: Query #3 updated.

retag diff --url $REDASH_URL --api-key $REDASH_API_KEY --yaml example.yml                
 queries:
   - id: 1
     name: Query 1
     tags: [foo, bar, baz]
   - id: 2
     name: Great Query
     tags: [foo, bar]
   - id: 3
     name: Awesome Query
     tags: [bar, baz]