Flaky `context::context_tests::test_cache_is_cleared_when_io_is_started`

[link2xt]

This is not the first time test_cache_is_cleared_when_io_is_started fails reporting that some table does not exist:

        FAIL [   0.446s] ( 301/1173) deltachat context::context_tests::test_cache_is_cleared_when_io_is_started
  stdout ───

    running 1 test
    alice INFO: src/config.rs:770: Creating a pseudo configured account which will not be able to send or receive messages. Only meant for tests!
    alice Received Event { id: 1671130952, typ: AccountsItemChanged }
    alice INFO: src/scheduler.rs:73: starting IO
    alice INFO: src/scheduler.rs:352: Starting inbox loop.
    alice INFO: src/scheduler.rs:372: Transport 1: Preparing new IMAP session for inbox.
    alice INFO: src/imap.rs:295: Connecting to IMAP server.
    alice Received Event { id: 1671130952, typ: ConnectivityChanged }
    alice Received Event { id: 1671130952, typ: ConnectivityChanged }
    alice WARN: src/scheduler.rs:378: Transport 1: Failed to prepare inbox connection: No IMAP connection candidates provided.
    alice INFO: src/scheduler.rs:372: Transport 1: Preparing new IMAP session for inbox.
    alice WARN: src/imap.rs:276: IMAP got rate limited, waiting for 0h 0m 1s until can connect.

    ========== Chats of alice: ==========

    alice INFO: src/scheduler.rs:559: Starting SMTP loop.
    alice INFO: src/scheduler.rs:740: scheduler is running
    alice Received Event { id: 1671130952, typ: ConnectivityChanged }
    alice INFO: src/smtp.rs:558: Selected rows from SMTP queue: [].
    alice INFO: src/scheduler.rs:602: SMTP fake idle started.
    alice Received Event { id: 1671130952, typ: ConnectivityChanged }
    alice INFO: src/scheduler.rs:644: SMTP has no messages to retry, waiting for interrupt.
    alice WARN: src/ephemeral.rs:569: Can't calculate next ephemeral timeout: no such table: msgs
    alice INFO: src/location.rs:711: Location loop is waiting for 24h 0m 0s or interrupt
    alice INFO: src/contact.rs:2149: Recently seen loop waiting for 24h 0m 0s or interrupt
    alice WARN: src/ephemeral.rs:578: Can't calculate timestamp of the next message expiration: failed to fetch raw config: delete_device_after
    alice INFO: src/ephemeral.rs:609: Ephemeral loop waiting for deletion in 24h 0m 0s or interrupt
    test context::context_tests::test_cache_is_cleared_when_io_is_started ... FAILED

    failures:

    failures:
        context::context_tests::test_cache_is_cleared_when_io_is_started

    test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1134 filtered out; finished in 0.42s

  stderr ───

    thread 'context::context_tests::test_cache_is_cleared_when_io_is_started' (9973) panicked at src/test_utils.rs:1475:13:
    Logged an unexpected warning: Event { id: 1671130952, typ: Warning("src/ephemeral.rs:569: Can't calculate next ephemeral timeout: no such table: msgs") }
    stack backtrace:
       0: __rustc::rust_begin_unwind
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/std/src/panicking.rs:679:5
       1: core::panicking::panic_fmt
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/panicking.rs:80:14
       2: <deltachat::test_utils::InnerLogSink as core::ops::drop::Drop>::drop
                 at ./src/test_utils.rs:1467:13
       3: core::ptr::drop_glue::<deltachat::test_utils::InnerLogSink>
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ptr/mod.rs:823:1
       4: core::ptr::drop_in_place::<deltachat::test_utils::InnerLogSink>
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ptr/mod.rs:818:14
       5: <alloc::sync::Arc<deltachat::test_utils::InnerLogSink>>::drop_slow
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/alloc/src/sync.rs:2143:18
       6: <alloc::sync::Arc<deltachat::test_utils::InnerLogSink> as core::ops::drop::Drop>::drop
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/alloc/src/sync.rs:2877:18
       7: core::ptr::drop_glue::<alloc::sync::Arc<deltachat::test_utils::InnerLogSink>>
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ptr/mod.rs:823:1
       8: core::ptr::drop_glue::<deltachat::test_utils::LogSink>
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ptr/mod.rs:823:1
       9: core::ptr::drop_glue::<deltachat::test_utils::TestContext>
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ptr/mod.rs:823:1
      10: deltachat::context::context_tests::test_cache_is_cleared_when_io_is_started::{closure#0}
                 at ./src/context/context_tests.rs:631:1
      11: <core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>> as core::future::future::Future>::poll
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/future/future.rs:133:9
      12: <tokio::runtime::park::CachedParkThread>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>::{closure#0}
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/park.rs:284:71
      13: tokio::task::coop::with_budget::<core::task::poll::Poll<core::result::Result<(), anyhow::Error>>, <tokio::runtime::park::CachedParkThread>::block_on<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>::{closure#0}>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/task/coop/mod.rs:167:5
      14: tokio::task::coop::budget::<core::task::poll::Poll<core::result::Result<(), anyhow::Error>>, <tokio::runtime::park::CachedParkThread>::block_on<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>::{closure#0}>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/task/coop/mod.rs:133:5
      15: <tokio::runtime::park::CachedParkThread>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/park.rs:284:31
      16: <tokio::runtime::context::blocking::BlockingRegionGuard>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/context/blocking.rs:66:14
      17: <tokio::runtime::scheduler::multi_thread::MultiThread>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>::{closure#0}
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/scheduler/multi_thread/mod.rs:92:22
      18: tokio::runtime::context::runtime::enter_runtime::<<tokio::runtime::scheduler::multi_thread::MultiThread>::block_on<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>::{closure#0}, core::result::Result<(), anyhow::Error>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/context/runtime.rs:65:16
      19: <tokio::runtime::scheduler::multi_thread::MultiThread>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/scheduler/multi_thread/mod.rs:91:9
      20: <tokio::runtime::runtime::Runtime>::block_on_inner::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/runtime.rs:376:50
      21: <tokio::runtime::runtime::Runtime>::block_on::<core::pin::Pin<&mut dyn core::future::future::Future<Output = core::result::Result<(), anyhow::Error>>>>
                 at /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.53.1/src/runtime/runtime.rs:343:18
      22: deltachat::context::context_tests::test_cache_is_cleared_when_io_is_started
                 at ./src/context/context_tests.rs:630:7
      23: deltachat::context::context_tests::test_cache_is_cleared_when_io_is_started::{closure#0}
                 at ./src/context/context_tests.rs:598:56
      24: <deltachat::context::context_tests::test_cache_is_cleared_when_io_is_started::{closure#0} as core::ops::function::FnOnce<()>>::call_once
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ops/function.rs:250:5
      25: <fn() -> core::result::Result<(), alloc::string::String> as core::ops::function::FnOnce<()>>::call_once
                 at /rustc/88d9e12ae178fab0fb5cc050a94da85685d449ea/library/core/src/ops/function.rs:250:5
    note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

  Cancelling due to test failure: 3 tests still running
        PASS [   0.097s] ( 302/1173) deltachat context::context_tests::test_get_fresh_msgs_and_muted_until
        PASS [   1.485s] ( 303/1173) deltachat context::context_tests::test_context_change_passphrase
        PASS [   1.877s] ( 304/1173) deltachat context::context_tests::test_check_passphrase
────────────
     Summary [  29.593s] 304/1173 tests run: 303 passed, 1 failed, 1 skipped
        FAIL [   0.446s] ( 301/1173) deltachat context::context_tests::test_cache_is_cleared_when_io_is_started

Example run is at https://github.com/chatmail/core/actions/runs/33870825872/job/101016136283?pr=8667