feat(sqlite): add cold read benchmarks and simplify optimizations

.agent/benchmarks/sqlite-realworld-smoke/disabled-full-latest/summary.md

@@ -0,0 +1,30 @@
+SQLite real-world benchmark
+
+Server SQLite time only. Setup time, sleep delay, wake/cold-start time, and client RTT are not included.
+
+| workload | category | size | server_ms | get_pages | fetched_pages | cache_hits | cache_misses | rows/ops | pages |
+| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
+| small-rowid-point | canary | 0.25 MiB | 255.3 | 20 | 244 | 0 | 20 | 50 | 166 |
+| small-schema-read | canary | 0.25 MiB | 5.3 | 4 | 4 | 0 | 4 | 128 | 166 |
+| small-range-scan | canary | 0.25 MiB | 880.8 | 133 | 2051 | 0 | 133 | 128 | 166 |
+| rowid-range-forward | read | 2.00 MiB | 10817.3 | 1035 | 17179 | 0 | 1035 | 1024 | 1231 |
+| rowid-range-backward | read | 2.00 MiB | 4523.6 | 1035 | 1035 | 0 | 1035 | 1024 | 1231 |
+| secondary-index-covering-range | read | 2.00 MiB | 21.3 | 11 | 11 | 0 | 11 | 1024 | 1063 |
+| secondary-index-scattered-table | read | 2.00 MiB | 7778.9 | 1038 | 3241 | 0 | 1038 | 1024 | 1063 |
+| aggregate-status | read | 2.00 MiB | 14175.7 | 1037 | 16733 | 0 | 1037 | 1024 | 1231 |
+| aggregate-time-bucket | read | 2.00 MiB | 10989.9 | 1030 | 17172 | 0 | 1030 | 1024 | 1231 |
+| aggregate-tenant-time-range | read | 1.00 MiB | 226.4 | 39 | 111 | 0 | 39 | 16 | 623 |
+| feed-order-by-limit | read | 1.00 MiB | 2656.3 | 519 | 519 | 0 | 519 | 512 | 623 |
+| feed-pagination-adjacent | read | 1.00 MiB | 263.4 | 106 | 106 | 0 | 106 | 100 | 623 |
+| join-order-items | read | 2.00 MiB | 80.9 | 32 | 38 | 0 | 32 | 2048 | 1231 |
+| random-point-lookups | read | 2.00 MiB | 7718.5 | 1011 | 3304 | 0 | 1011 | 1000 | 1231 |
+| hot-index-cold-table | read | 2.00 MiB | 41.3 | 16 | 26 | 0 | 16 | 8 | 1063 |
+| ledger-without-rowid-range | read | 2.00 MiB | 458.6 | 94 | 176 | 0 | 94 | 564 | 176 |
+| write-batch-after-wake | write | 1.00 MiB | 402.4 | 15 | 17 | 0 | 15 | 1000 | 1642 |
+| update-hot-partition | write | 1.00 MiB | 6902.0 | 516 | 8498 | 0 | 516 | 64 | 623 |
+| delete-churn-range-read | write | 1.00 MiB | 7040.2 | 526 | 8398 | 0 | 526 | 448 | 623 |
+| migration-create-indexes-large | migration | 2.00 MiB | 14959.5 | 1030 | 17230 | 0 | 1030 |  | 1059 |
+| migration-create-indexes-skewed-large | migration | 2.00 MiB | 32741.9 | 2054 | 34577 | 0 | 2054 |  | 1055 |
+| migration-table-rebuild-large | migration | 2.00 MiB | 30746.7 | 2057 | 34767 | 0 | 2057 |  | 2070 |
+| migration-add-column-large | migration | 2.00 MiB | 4.2 | 3 | 3 | 0 | 3 |  | 1044 |
+| migration-ddl-small | canary | 0.00 MiB | 22.8 | 3 | 3 | 0 | 3 |  | 19 |

.agent/benchmarks/sqlite-realworld-smoke/disabled-latest/results.json

@@ -0,0 +1,228 @@
+{
+	"schemaVersion": 1,
+	"startedAt": "2026-04-29T10:18:23.224Z",
+	"finishedAt": "2026-04-29T10:19:02.894Z",
+	"config": {
+		"endpoint": "http://127.0.0.1:7520",
+		"profile": "smoke",
+		"selectedWorkloads": [
+			"rowid-range-forward",
+			"secondary-index-scattered-table",
+			"random-point-lookups",
+			"migration-add-column-large"
+		],
+		"sizes": {
+			"smallBytes": 262144,
+			"mediumBytes": 1048576,
+			"cacheFitBytes": 1048576,
+			"cacheOverflowBytes": 2097152,
+			"largeBytes": 2097152,
+			"rowBytes": 2048
+		},
+		"metricsToken": "dev-metrics",
+		"wakeDelayMs": 1000,
+		"postSetupWaitMs": 0,
+		"startLocalEnvoy": true,
+		"disableStorageCompaction": false,
+		"sqliteOptimizationsDisabled": true,
+		"sqliteOptimizationEnv": {
+			"RIVETKIT_SQLITE_OPT_READ_AHEAD": "false",
+			"RIVETKIT_SQLITE_OPT_CACHE_HIT_PREDICTOR_TRAINING": "false",
+			"RIVETKIT_SQLITE_OPT_RECENT_PAGE_HINTS": "false",
+			"RIVETKIT_SQLITE_OPT_ADAPTIVE_READ_AHEAD": "false",
+			"RIVETKIT_SQLITE_OPT_PRELOAD_HINT_FLUSH": "false",
+			"RIVETKIT_SQLITE_OPT_STARTUP_PRELOAD_FIRST_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_PRELOAD_HINTS_ON_OPEN": "false",
+			"RIVETKIT_SQLITE_OPT_PRELOAD_HINT_HOT_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_PRELOAD_HINT_EARLY_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_PRELOAD_HINT_SCAN_RANGES": "false",
+			"RIVETKIT_SQLITE_OPT_DEDUP_GET_PAGES_META": "false",
+			"RIVETKIT_SQLITE_OPT_CACHE_GET_PAGES_VALIDATION": "false",
+			"RIVETKIT_SQLITE_OPT_RANGE_READS": "false",
+			"RIVETKIT_SQLITE_OPT_BATCH_CHUNK_READS": "false",
+			"RIVETKIT_SQLITE_OPT_DECODED_LTX_CACHE": "false",
+			"RIVETKIT_SQLITE_OPT_VFS_CACHE_FETCHED_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_VFS_CACHE_PREFETCHED_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_VFS_CACHE_STARTUP_PRELOADED_PAGES": "false",
+			"RIVETKIT_SQLITE_OPT_VFS_SCAN_RESISTANT_CACHE": "false",
+			"RIVETKIT_SQLITE_OPT_STARTUP_PRELOAD_MAX_BYTES": "0",
+			"RIVETKIT_SQLITE_OPT_STARTUP_PRELOAD_FIRST_PAGE_COUNT": "0",
+			"RIVETKIT_SQLITE_OPT_VFS_PAGE_CACHE_CAPACITY_PAGES": "1",
+			"RIVETKIT_SQLITE_OPT_VFS_PROTECTED_CACHE_PAGES": "0"
+		},
+		"cacheSizing": {
+			"sqlitePageSizeBytes": 4096,
+			"startupPreloadMaxBytes": 0,
+			"vfsPageCacheCapacityPages": 1,
+			"vfsPageCacheCapacityBytes": 4096,
+			"largeBytesExceedsConfiguredVfsCache": true
+		}
+	},
+	"cacheConfigProbe": {
+		"sqliteCacheSizePragma": -2000,
+		"sqlitePageSize": 4096,
+		"pageCount": 16
+	},
+	"results": [
+		{
+			"workload": "rowid-range-forward",
+			"description": "Large append-like INTEGER PRIMARY KEY forward range scan.",
+			"category": "read",
+			"sizeClass": "large",
+			"targetBytes": 2097152,
+			"actorKey": [
+				"sqlite-realworld-bench",
+				"sqlite-realworld-1777457901653-7c6244b2",
+				"rowid-range-forward"
+			],
+			"actorId": "9qhpr92yuo3cyli6hwbsfvj2kjcl00",
+			"setup": {
+				"rows": 1024,
+				"targetBytes": 2097152,
+				"rowBytes": 2048,
+				"setupMs": 614.354797,
+				"pageCount": 1230
+			},
+			"main": {
+				"ms": 14946.551086000001,
+				"workload": "rowid-range-forward",
+				"rows": 1024,
+				"bytes": 2097152,
+				"pageCount": 1231
+			},
+			"vfsMetrics": {
+				"resolvePagesTotal": 1032,
+				"resolvePagesRequestedTotal": 1032,
+				"resolvePagesCacheHitsTotal": -3,
+				"resolvePagesCacheMissesTotal": 1035,
+				"getPagesTotal": 1035,
+				"pagesFetchedTotal": 17179,
+				"prefetchPagesTotal": 16144,
+				"bytesFetchedTotal": 70365184,
+				"prefetchBytesTotal": 66125824,
+				"getPagesDurationSecondsSum": 14.822318194999998,
+				"getPagesDurationSecondsCount": 1035
+			}
+		},
+		{
+			"workload": "secondary-index-scattered-table",
+			"description": "Large secondary-index range that visits table rows in scattered rowid order.",
+			"category": "read",
+			"sizeClass": "large",
+			"targetBytes": 2097152,
+			"actorKey": [
+				"sqlite-realworld-bench",
+				"sqlite-realworld-1777457901653-7c6244b2",
+				"secondary-index-scattered-table"
+			],
+			"actorId": "dpzhx6td3elrkg4w33bpnshfh9dl00",
+			"setup": {
+				"rows": 1024,
+				"targetBytes": 2097152,
+				"rowBytes": 2048,
+				"setupMs": 461.5752219999995,
+				"pageCount": 1062
+			},
+			"main": {
+				"ms": 8251.848477,
+				"workload": "secondary-index-scattered-table",
+				"rows": 1024,
+				"bytes": 2097152,
+				"pageCount": 1063
+			},
+			"vfsMetrics": {
+				"resolvePagesTotal": 1035,
+				"resolvePagesRequestedTotal": 1035,
+				"resolvePagesCacheHitsTotal": -3,
+				"resolvePagesCacheMissesTotal": 1038,
+				"getPagesTotal": 1038,
+				"pagesFetchedTotal": 3514,
+				"prefetchPagesTotal": 2476,
+				"bytesFetchedTotal": 14393344,
+				"prefetchBytesTotal": 10141696,
+				"getPagesDurationSecondsSum": 8.176378407,
+				"getPagesDurationSecondsCount": 1038
+			}
+		},
+		{
+			"workload": "random-point-lookups",
+			"description": "Deterministic random primary-key point lookups across a large table.",
+			"category": "read",
+			"sizeClass": "large",
+			"targetBytes": 2097152,
+			"actorKey": [
+				"sqlite-realworld-bench",
+				"sqlite-realworld-1777457901653-7c6244b2",
+				"random-point-lookups"
+			],
+			"actorId": "dh1qdiyzkl40znrz5wr8zuevkkcl00",
+			"setup": {
+				"rows": 1024,
+				"targetBytes": 2097152,
+				"rowBytes": 2048,
+				"setupMs": 582.4261729999998,
+				"pageCount": 1230
+			},
+			"main": {
+				"ms": 8725.889302,
+				"workload": "random-point-lookups",
+				"ops": 1000,
+				"bytes": 2048000,
+				"pageCount": 1231
+			},
+			"vfsMetrics": {
+				"resolvePagesTotal": 1008,
+				"resolvePagesRequestedTotal": 1008,
+				"resolvePagesCacheHitsTotal": -3,
+				"resolvePagesCacheMissesTotal": 1011,
+				"getPagesTotal": 1011,
+				"pagesFetchedTotal": 3208,
+				"prefetchPagesTotal": 2197,
+				"bytesFetchedTotal": 13139968,
+				"prefetchBytesTotal": 8998912,
+				"getPagesDurationSecondsSum": 8.084016886,
+				"getPagesDurationSecondsCount": 1011
+			}
+		},
+		{
+			"workload": "migration-add-column-large",
+			"description": "Large-table ADD COLUMN migration that should avoid row rewrite.",
+			"category": "migration",
+			"sizeClass": "large",
+			"targetBytes": 2097152,
+			"actorKey": [
+				"sqlite-realworld-bench",
+				"sqlite-realworld-1777457901653-7c6244b2",
+				"migration-add-column-large"
+			],
+			"actorId": "hsw0n9x0nf0tvc6hbmfkm19xnmcl00",
+			"setup": {
+				"rows": 1024,
+				"targetBytes": 2097152,
+				"rowBytes": 2048,
+				"setupMs": 388.5069980000044,
+				"pageCount": 1043
+			},
+			"main": {
+				"ms": 2.7332150000002002,
+				"workload": "migration-add-column-large",
+				"alters": 1,
+				"rewritesRows": false,
+				"pageCount": 1044
+			},
+			"vfsMetrics": {
+				"resolvePagesTotal": 0,
+				"resolvePagesRequestedTotal": 0,
+				"resolvePagesCacheHitsTotal": -3,
+				"resolvePagesCacheMissesTotal": 3,
+				"getPagesTotal": 3,
+				"pagesFetchedTotal": 3,
+				"prefetchPagesTotal": 0,
+				"bytesFetchedTotal": 12288,
+				"prefetchBytesTotal": 0,
+				"getPagesDurationSecondsSum": 0.024192735,
+				"getPagesDurationSecondsCount": 3
+			}
+		}
+	]
+}

.agent/benchmarks/sqlite-realworld-smoke/disabled-latest/summary.md

@@ -0,0 +1,10 @@
+SQLite real-world benchmark
+
+Server SQLite time only. Setup time, sleep delay, wake/cold-start time, and client RTT are not included.
+
+| workload | category | size | server_ms | get_pages | fetched_pages | cache_hits | cache_misses | rows/ops | pages |
+| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
+| rowid-range-forward | read | 2.00 MiB | 14946.6 | 1035 | 17179 | -3 | 1035 | 1024 | 1231 |
+| secondary-index-scattered-table | read | 2.00 MiB | 8251.8 | 1038 | 3514 | -3 | 1038 | 1024 | 1063 |
+| random-point-lookups | read | 2.00 MiB | 8725.9 | 1011 | 3208 | -3 | 1011 | 1000 | 1231 |
+| migration-add-column-large | migration | 2.00 MiB | 2.7 | 3 | 3 | -3 | 3 |  | 1044 |

.agent/benchmarks/sqlite-realworld-smoke/feed-pagination-adjacent-latest/results.json

@@ -0,0 +1,79 @@
+{
+	"schemaVersion": 1,
+	"startedAt": "2026-04-29T10:09:16.917Z",
+	"finishedAt": "2026-04-29T10:09:18.608Z",
+	"config": {
+		"endpoint": "http://127.0.0.1:6420",
+		"profile": "smoke",
+		"selectedWorkloads": [
+			"feed-pagination-adjacent"
+		],
+		"sizes": {
+			"smallBytes": 262144,
+			"mediumBytes": 1048576,
+			"cacheFitBytes": 1048576,
+			"cacheOverflowBytes": 2097152,
+			"largeBytes": 2097152,
+			"rowBytes": 2048
+		},
+		"metricsToken": "dev-metrics",
+		"wakeDelayMs": 1000,
+		"postSetupWaitMs": 0,
+		"startLocalEnvoy": true,
+		"disableStorageCompaction": false,
+		"cacheSizing": {
+			"sqlitePageSizeBytes": 4096,
+			"startupPreloadMaxBytes": 1048576,
+			"vfsPageCacheCapacityPages": 50000,
+			"vfsPageCacheCapacityBytes": 204800000,
+			"standardLargeBytesExceedsDefaultVfsCache": false
+		}
+	},
+	"cacheConfigProbe": {
+		"sqliteCacheSizePragma": -2000,
+		"sqlitePageSize": 4096,
+		"pageCount": 16
+	},
+	"results": [
+		{
+			"workload": "feed-pagination-adjacent",
+			"description": "Adjacent cursor pagination over an indexed recent-feed query.",
+			"category": "read",
+			"sizeClass": "medium",
+			"targetBytes": 1048576,
+			"actorKey": [
+				"sqlite-realworld-bench",
+				"sqlite-realworld-1777457355366-7b780a8f",
+				"feed-pagination-adjacent"
+			],
+			"actorId": "th4hd4y4xocgt7ha3f94wxy7fubl00",
+			"setup": {
+				"rows": 512,
+				"targetBytes": 1048576,
+				"rowBytes": 2048,
+				"setupMs": 302.266161,
+				"pageCount": 622
+			},
+			"main": {
+				"ms": 47.609035000000404,
+				"workload": "feed-pagination-adjacent",
+				"firstPageRows": 100,
+				"rows": 100,
+				"pageCount": 623
+			},
+			"vfsMetrics": {
+				"resolvePagesTotal": 103,
+				"resolvePagesRequestedTotal": 103,
+				"resolvePagesCacheHitsTotal": 96,
+				"resolvePagesCacheMissesTotal": 7,
+				"getPagesTotal": 7,
+				"pagesFetchedTotal": 135,
+				"prefetchPagesTotal": 128,
+				"bytesFetchedTotal": 552960,
+				"prefetchBytesTotal": 524288,
+				"getPagesDurationSecondsSum": 0.044485068,
+				"getPagesDurationSecondsCount": 7
+			}
+		}
+	]
+}

.agent/benchmarks/sqlite-realworld-smoke/feed-pagination-adjacent-latest/summary.md

@@ -0,0 +1,7 @@
+SQLite real-world benchmark
+
+Server SQLite time only. Setup time, sleep delay, wake/cold-start time, and client RTT are not included.
+
+| workload | category | size | server_ms | get_pages | fetched_pages | cache_hits | cache_misses | rows/ops | pages |
+| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
+| feed-pagination-adjacent | read | 1.00 MiB | 47.6 | 7 | 135 | 96 | 7 | 100 | 623 |