onboarding: Don't show introduce zulip view modals to existing users.

We don't want to show one-time modals introducing 'Inbox' and
'Recent conversations' views to existing users.

When a user views a modal, we mark it as read by storing a row
in the 'OnboardingStep' model. Once marked as read, the user will
no longer see the modal.

This commit adds a migration to create
two rows per user (mark them as read) in OnboardingStep model.

zerver/migrations/0501_mark_introduce_zulip_view_modals_as_read.py

@@ -0,0 +1,75 @@
+# Generated by Django 4.2.10 on 2024-03-11 04:43
+
+from django.db import connection, migrations
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+from django.db.migrations.state import StateApps
+from django.db.models import Q
+from django.utils.timezone import now as timezone_now
+from psycopg2.sql import SQL
+
+
+def mark_introduce_zulip_view_modals_as_read(
+    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
+) -> None:
+    with connection.cursor() as cursor:
+        cursor.execute(
+            SQL(
+                "SELECT MAX(id) FROM zerver_userprofile WHERE is_bot = False AND is_mirror_dummy = False;"
+            )
+        )
+        (max_id,) = cursor.fetchone()
+
+    if max_id is None:
+        return
+
+    BATCH_SIZE = 10000
+    lower_id_bound = 0
+    timestamp_value = timezone_now()
+    while lower_id_bound < max_id:
+        upper_id_bound = min(lower_id_bound + BATCH_SIZE, max_id)
+        with connection.cursor() as cursor:
+            query = SQL("""
+                INSERT INTO zerver_onboardingstep (user_id, onboarding_step, timestamp)
+                SELECT id, step, %(timestamp_value)s
+                FROM zerver_userprofile
+                CROSS JOIN UNNEST(%(step_names)s) step
+                WHERE is_bot = False
+                AND is_mirror_dummy = False
+                AND id > %(lower_id_bound)s AND id <= %(upper_id_bound)s;
+                """)
+            cursor.execute(
+                query,
+                {
+                    "timestamp_value": timestamp_value,
+                    "step_names": ["intro_inbox_view_modal", "intro_recent_view_modal"],
+                    "lower_id_bound": lower_id_bound,
+                    "upper_id_bound": upper_id_bound,
+                },
+            )
+
+        print(f"Processed {upper_id_bound} / {max_id}")
+        lower_id_bound = lower_id_bound + BATCH_SIZE
+
+
+def mark_introduce_zulip_view_modals_as_unread(
+    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
+) -> None:
+    OnboardingStep = apps.get_model("zerver", "OnboardingStep")
+
+    OnboardingStep.objects.filter(
+        Q(onboarding_step="intro_inbox_view_modal") | Q(onboarding_step="intro_recent_view_modal")
+    ).delete()
+
+
+class Migration(migrations.Migration):
+    atomic = False
+    dependencies = [
+        ("zerver", "0500_realm_zulip_update_announcements_stream"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            mark_introduce_zulip_view_modals_as_read,
+            reverse_code=mark_introduce_zulip_view_modals_as_unread,
+        ),
+    ]