docs: add migration guide for 0.7.0

[deepjoy]

Summary

• Adds docs/migrating-to-0.7.md covering all breaking changes and new features since 0.6 (15 commits from d903234..HEAD)
• Documents 5 breaking changes: database recreation (timestamp normalization + migration consolidation), typed Memo on TypedExecutor, SubmitOutcome::Inserted struct variant, DispatchGate::admit() returning Admission enum, and tag query method renames
• Documents 6 new features: group pause/resume, token-bucket rate limiting, priority aging, weighted fair scheduling, fail_fast() builder method, and tag key prefix queries
• Includes before/after Rust code examples and import guidance, matching existing migration doc style

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Benchmark Comparison

Click to expand

group                                       main                                    pr
-----                                       ----                                    --
backoff_delay/constant                      1.00     44.2±0.23ns 431.1 MElem/sec    1.00     44.5±2.01ns 429.0 MElem/sec
backoff_delay/exponential                   1.00    191.0±1.11ns 99.9 MElem/sec     1.00    190.8±0.88ns 100.0 MElem/sec
backoff_delay/exponential_jitter            1.00    408.7±0.78ns 46.7 MElem/sec     1.11    452.0±1.03ns 42.2 MElem/sec
backoff_delay/linear                        1.00     75.9±0.15ns 251.2 MElem/sec    1.00     76.0±0.31ns 251.1 MElem/sec
batch_submit/1000                           1.03     34.0±2.61ms 28.7 KElem/sec     1.00     32.9±2.29ms 29.7 KElem/sec
byte_progress/byte_reporting_500            1.01    194.0±3.97ms  2.5 KElem/sec     1.00    191.7±3.17ms  2.5 KElem/sec
byte_progress/noop_500                      1.01    182.8±4.18ms  2.7 KElem/sec     1.00    180.9±4.27ms  2.7 KElem/sec
byte_progress_snapshot/100_tasks            1.03     82.5±2.22ms  1211 Elem/sec     1.00     80.2±2.13ms  1246 Elem/sec
concurrency_scaling/1                       1.01    377.1±4.71ms  1325 Elem/sec     1.00    375.1±5.71ms  1333 Elem/sec
concurrency_scaling/2                       1.00    276.7±4.92ms  1806 Elem/sec     1.00    277.2±3.90ms  1803 Elem/sec
concurrency_scaling/4                       1.00    230.7±5.80ms  2.1 KElem/sec     1.00    230.1±7.46ms  2.1 KElem/sec
concurrency_scaling/8                       1.02    182.9±3.86ms  2.7 KElem/sec     1.00    180.0±3.19ms  2.7 KElem/sec
count_by_tags/100                           1.01    126.8±3.13µs  7.7 KElem/sec     1.00    126.0±2.71µs  7.7 KElem/sec
count_by_tags/1000                          1.01    216.8±4.58µs  4.5 KElem/sec     1.00    215.4±5.71µs  4.5 KElem/sec
count_by_tags/5000                          1.01    610.8±7.09µs  1637 Elem/sec     1.00    602.5±5.28µs  1659 Elem/sec
dep_chain_dispatch/10                       1.00     10.8±0.16ms   929 Elem/sec     1.02     11.0±0.10ms   908 Elem/sec
dep_chain_dispatch/25                       1.00     26.5±0.56ms   942 Elem/sec     1.02     27.1±0.71ms   922 Elem/sec
dep_chain_dispatch/50                       1.00     53.3±0.80ms   938 Elem/sec     1.01     53.7±0.67ms   931 Elem/sec
dep_chain_submit/10                         1.00      3.0±0.12ms  3.2 KElem/sec     1.02      3.1±0.13ms  3.2 KElem/sec
dep_chain_submit/200                        1.01     77.1±3.50ms  2.5 KElem/sec     1.00     76.3±3.54ms  2.6 KElem/sec
dep_chain_submit/50                         1.00     16.6±0.68ms  2.9 KElem/sec     1.00     16.6±0.79ms  2.9 KElem/sec
dep_fan_in_dispatch/10                      1.00      6.0±0.14ms  1846 Elem/sec     1.00      6.0±0.11ms  1841 Elem/sec
dep_fan_in_dispatch/100                     1.00     40.6±0.87ms  2.4 KElem/sec     1.01     41.0±0.71ms  2.4 KElem/sec
dep_fan_in_dispatch/50                      1.00     21.4±0.32ms  2.3 KElem/sec     1.00     21.5±0.46ms  2.3 KElem/sec
dispatch_and_complete/1000                  1.01    368.8±6.61ms  2.6 KElem/sec     1.00    365.0±4.82ms  2.7 KElem/sec
dispatch_group_scaling/1                    1.01    419.1±7.60ms  1193 Elem/sec     1.00    416.7±5.76ms  1200 Elem/sec
dispatch_group_scaling/10                   1.00    418.9±7.43ms  1193 Elem/sec     1.00    418.0±7.78ms  1196 Elem/sec
dispatch_group_scaling/100                  1.00    421.2±8.04ms  1187 Elem/sec     1.00    419.5±7.43ms  1191 Elem/sec
dispatch_group_scaling/50                   1.00    417.5±7.53ms  1197 Elem/sec     1.00    419.5±7.35ms  1191 Elem/sec
dispatch_no_groups/500                      1.01    182.3±3.90ms  2.7 KElem/sec     1.00    181.0±3.44ms  2.7 KElem/sec
dispatch_one_group/500                      1.00    411.1±8.53ms  1216 Elem/sec     1.02    417.8±4.81ms  1196 Elem/sec
dispatch_permanent_failure/500              1.02    350.4±5.80ms  1426 Elem/sec     1.00    344.5±4.03ms  1451 Elem/sec
history_by_type/100                         1.00    219.5±5.06µs  4.4 KElem/sec     1.01    222.1±8.62µs  4.4 KElem/sec
history_by_type/1000                        1.08   853.2±71.72µs  1172 Elem/sec     1.00   790.4±43.32µs  1265 Elem/sec
history_by_type/5000                        1.07   839.8±48.93µs  1190 Elem/sec     1.00   785.6±48.81µs  1272 Elem/sec
history_query/100                           1.00   420.6±21.28µs  2.3 KElem/sec     1.04   438.9±20.54µs  2.2 KElem/sec
history_query/1000                          1.00   435.6±22.59µs  2.2 KElem/sec     1.00   435.2±24.82µs  2.2 KElem/sec
history_query/5000                          1.01   445.6±21.44µs  2.2 KElem/sec     1.00   440.4±25.56µs  2.2 KElem/sec
history_stats/100                           1.00    125.9±1.06µs  7.8 KElem/sec     1.00    126.3±0.90µs  7.7 KElem/sec
history_stats/1000                          1.01    191.8±0.97µs  5.1 KElem/sec     1.00    190.0±1.44µs  5.1 KElem/sec
history_stats/5000                          1.02    484.9±2.22µs  2.0 KElem/sec     1.00   473.6±11.97µs  2.1 KElem/sec
mixed_priority_dispatch/500                 1.02    232.3±5.45ms  2.1 KElem/sec     1.00    227.5±7.88ms  2.1 KElem/sec
peek_next/100                               1.02    120.2±2.86µs  8.1 KElem/sec     1.00    118.4±2.49µs  8.3 KElem/sec
peek_next/1000                              1.02    120.7±2.93µs  8.1 KElem/sec     1.00    118.3±2.17µs  8.3 KElem/sec
peek_next/5000                              1.01    122.0±2.89µs  8.0 KElem/sec     1.00   121.1±12.75µs  8.1 KElem/sec
query_ids_by_tags/100                       1.02    184.9±3.17µs  5.3 KElem/sec     1.00    181.7±4.02µs  5.4 KElem/sec
query_ids_by_tags/1000                      1.00   815.9±11.14µs  1225 Elem/sec     1.01   826.2±19.42µs  1210 Elem/sec
query_ids_by_tags/5000                      1.04      3.7±0.07ms   267 Elem/sec     1.00      3.6±0.01ms   278 Elem/sec
retryable_dead_letter/constant              1.02    107.1±0.99ms   933 Elem/sec     1.00    105.3±1.90ms   949 Elem/sec
retryable_dead_letter/exponential           1.02    107.6±1.73ms   929 Elem/sec     1.00    105.1±0.83ms   951 Elem/sec
retryable_dead_letter/exponential_jitter    1.01    107.0±0.94ms   934 Elem/sec     1.00    106.1±0.89ms   942 Elem/sec
retryable_dead_letter/linear                1.01    106.9±0.97ms   935 Elem/sec     1.00    106.1±0.86ms   942 Elem/sec
submit_dedup_hit/1000                       1.01    207.8±5.84ms  4.7 KElem/sec     1.00    205.2±5.65ms  4.8 KElem/sec
submit_tasks/1000                           1.02    181.5±5.68ms  5.4 KElem/sec     1.00    178.3±4.21ms  5.5 KElem/sec
submit_with_tags/0                          1.02     90.3±3.49ms  5.4 KElem/sec     1.00     88.7±2.66ms  5.5 KElem/sec
submit_with_tags/10                         1.00   239.8±10.02ms  2.0 KElem/sec     1.00   240.2±10.78ms  2.0 KElem/sec
submit_with_tags/20                         1.00   390.4±16.79ms  1280 Elem/sec     1.01   392.6±17.82ms  1273 Elem/sec
submit_with_tags/5                          1.00    164.1±6.50ms  3.0 KElem/sec     1.00    164.7±6.51ms  3.0 KElem/sec
tag_values/100                              1.00    132.0±3.02µs  7.4 KElem/sec     1.01    132.7±3.32µs  7.4 KElem/sec
tag_values/1000                             1.01    195.9±3.40µs  5.0 KElem/sec     1.00    193.4±3.64µs  5.0 KElem/sec
tag_values/5000                             1.01    460.3±4.95µs  2.1 KElem/sec     1.00    454.5±4.16µs  2.1 KElem/sec