Consider this:
```python
for row in doc.get_children():
row.db_set("amount", 0)
```
This sounds like it will do one write query for each row but it does 2
because of this unnecessary locking of child tables.
* fix: reduce bulk insert batch size
Back when this feature was added it used to lazily evaluate the input.
Now the iterator is consumed upfront so large batch sizes == huge memory usage.
* perf: bring back iterator for bulk_insert
Bulk insert used to support iterator for consuming arbitrarily large
amount of data and inserting it. Since child table support was added, it
can't do it anymore because that requires collecting values.
This change now brings back iterators by batching input iterator (by
default 1000) documents.
This is almost as good as original change from design POV. Performance
is still meh for flat documents.
* perf: Reduce penalty for lack of redis connection
If redis isn't running than this client cache is slower than default
implementation because of the extra locking overhead.
* test: update perf redis counts
* perf: cache table columns in client-cache
* fix: race condition on cache-client_cache init
Rare but apparant in synthetic benchmarks.
Cache is set but client cache is still being initialized then request
will fail.
* perf: Don't run notifications when loading document
WHAT?
* fix: use cached doc to repopulate
* perf: reduce get_meta calls
* perf: resolve rounding method once
When rounding method is explcitly specified it's 1.4x faster.
* perf: reorder checks
Bankers rounding is default and most common now
* perf: speedup get_system_settings
`get_doc` is single most used commands, directly and indirectly.
Currently there's QB overhead of building queries.
These queries are SO SIMPLE, I don't believe we need QB to keep these
maintainable or compatible with databases.
Microbenchmarks (first is simple flat document, second has many child tables):
```
bench_orm_bench_get_doc: Mean +- std dev: [before] 10.7 ms +- 0.2 ms -> [after] 7.24 ms +- 0.15 ms: 1.48x faster
bench_orm_bench_get_user: Mean +- std dev: [before] 16.3 ms +- 0.2 ms -> [after] 9.50 ms +- 0.14 ms: 1.72x faster
```
* fix: Apply read_only_method decorator to Document methods
* fix: update tests for read-only document context manager
* refactor: place mappers into read-only mode
Reapply "refactor: place mappers into read-only mode"
This reverts commit a8208d57069c63f0982bf2881bcad28a4b349f3c.
read-only mode is now thread safe
* refactor: improve maintainability with a simple dispatcher
* refactor: improve maintainability with a init dispatcher on Document
* refactor: improve maintainability with an init dispatcher on meta
