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0dca8f2a38
Migration plan: 1. Add NULLable .last_update_id column to UserPresence with default 0 for new objects. 2. Backfill the value to 0 for old UserPresences, can be done in the background while server is running. 3. Make the column non-NULL. 4. Add new model PresenceSequence and create its rows for old realms.
30 lines
1000 B
Python
30 lines
1000 B
Python
# Generated by Django 5.0.5 on 2024-05-02 02:17
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from django.db import migrations, models
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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("zerver", "0524_remove_userprofile_onboarding_steps"),
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]
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operations = [
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# Create a new column, making it NULLable to avoid locking the table
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# rewriting rows with a non-NULL default value.
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migrations.AddField(
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model_name="userpresence",
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name="last_update_id",
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field=models.PositiveBigIntegerField(db_index=True, null=True),
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),
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# This is an SQL noop, since Django doesn't add defaults at database level.
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# The default guarantees new rows will have a value. Old rows can get backfilled
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# in the next migration.
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migrations.AlterField(
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model_name="userpresence",
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name="last_update_id",
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field=models.PositiveBigIntegerField(db_index=True, default=0, null=True),
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),
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]
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