Struct M0005 

pub struct M0005;

Migration that adds a leading-cursor index for .all() subscription scans.

Changes

• Creates idx_event_type_cursor on (aggregator_type, timestamp, timestamp_subsec, version, id).

Notes

• This is additive: idx_event_type_routing_cursor (m0004) is kept, since it still serves subscriptions that filter by routing_key.
• The trailing id is included so the index fully covers the keyset tiebreaker (id is the final ORDER BY / cursor column), avoiding any residual sort.
• It also lets the latest_timestamp() query (MAX(timestamp) over the same filter) read the index tail.

Dependencies

This migration depends on M0004.

Trait Implementations

impl Migration<MySql> for M0005

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<MySql>>>

Returns the list of parent migrations that must be applied before this migration can be applied.

fn operations(&self) -> Vec<Box<dyn Operation<MySql>>>

Returns the list of operations that make up the migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that should be run before this migration when applying. but when reverting this migration these migrations should be reverted after this migration is reverted.

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.

impl Migration<Postgres> for M0005

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<Postgres>>>

Returns the list of parent migrations that must be applied before this migration can be applied.

fn operations(&self) -> Vec<Box<dyn Operation<Postgres>>>

Returns the list of operations that make up the migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that should be run before this migration when applying. but when reverting this migration these migrations should be reverted after this migration is reverted.

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.

impl Migration<Sqlite> for M0005

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<Sqlite>>>

Returns the list of parent migrations that must be applied before this migration can be applied.

fn operations(&self) -> Vec<Box<dyn Operation<Sqlite>>>

Returns the list of operations that make up the migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that should be run before this migration when applying. but when reverting this migration these migrations should be reverted after this migration is reverted.

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.