art: v2 artwork for the 504 read-amplification post (6 targets)

Generated through post_art.py on the local RTX 3060. Metaphor: four identical
steel pipes drawing from one dark reservoir, plus a single short pipe that
bypasses all four into a lit chamber (four redundant reads vs the bypass path).

- banner 1600x900 from the planned crop (band 755,119-1281,675, x1.43, subject
  at 47.0% of the banner width) instead of the on-the-fly fallback
- EN + ZH OG cards, 800/400 list thumbs, banner webp
- evidence line: 4 reads/file - 960 per page - 0.3 us cache hit

State mirrored into the repo so git alone reproduces the frame: the caption,
plus this slug in metaphors.json and prompts_catalog.json. banner-plan.json
also picks up the 22 frames that were in art-meta but had no plan entry.

Verified: check-assets 190/190 with the post temporarily published, both pages
point at their own og card and banner, then reverted to draft true and rebuilt
-- no page left in dist. ComfyUI terminated after the render.

scripts/og-gen/metaphors.json

@@ -1,7 +1,4 @@
 {
-  "how-i-built-an-automated-music-video-pipeline": "A modular obsidian workstation with a circular glass acoustic resonator, routing three floating neon waveform ribbons into an automated delivery chute on a dark bench",
-  "uploading-large-videos-to-youtube-via-cdp": "A heavy dark alloy container vault clamped on an inspection rail, fed by a thick vertical data injector conduit, while a thin blue laser probe connects to a recessed port",
-  "debugging-remotion-video-jitter": "An obsidian video frame holding two floating crystal slabs in a precision gantry, a jagged red pulse waveform along the lower rail smoothed into a calm violet harmonic wave",
   "adding-a-domain-to-someone-elses-mail-server": "A set of four brass routing vanes mounted along a dark obsidian mail chute, three of them steering translucent envelopes cleanly away, while the fourth channel is physically sealed by a solid black baffle wall",
   "adding-english-mode-to-a-chinese-only-web-app": "A monolithic dark application cube whose sealed front face carries two sliding glass plaques bearing different scripts, the second plaque being lifted into position by a precision gantry clamp at the doorway",
   "ai-furniture-compositing-with-flux-kontext": "A matte dark lounge chair module seated into a cut-away room diorama cube, its original studio backdrop peeling away as a curled translucent film sheet",
@@ -12,6 +9,7 @@
   "best-ai-video-generators-2026": "A rack of five glowing film reels of differing sizes, one heavy obsidian reel grounded on a heatsink pedestal while the others float as translucent holograms trailed by thin price-tag slivers",
   "calibrating-intel-quick-sync-hevc-quality": "A 3D topographic luminous video waveform mountain whose face drops off a 90-degree vertical cliff edge, flanked by two perfectly identical overlapping optical calibration prisms",
   "chainlink-vrf-v2-lottery-contract": "A transparent mechanical drum sealed inside a hexagonal glass case, its tumbling sphere fed by a chain of interlocked machined links, a polished glass orb hovering just outside the case",
+  "debugging-remotion-video-jitter": "An obsidian video frame holding two floating crystal slabs in a precision gantry, a jagged red pulse waveform along the lower rail smoothed into a calm violet harmonic wave",
   "docker-reported-exit-0-the-oom-killer-disagreed": "A translucent glass server cube displaying a deceptive green heartbeat light while a razor-sharp crimson beam slices horizontally through its bottom core, scattering fractured memory crystals",
   "does-hevc-actually-shrink-your-files": "Three matched glass vials of compressed film ribbon standing on a dark calibration bench, two visibly shorter than their source capsule while the third swells larger than the capsule it was poured from",
   "embedding-fonts-so-a-pdf-looks-the-same-everywhere": "A sealed obsidian press frame holding one smooth unmarked crystal sheet, lit identically through three differently angled viewing ports",
@@ -21,6 +19,7 @@
   "generating-subtitles-for-songs-without-timestamps": "A translucent glass rod of trapped sound resting on a dark machined spindle, a thin brass feeler tracing along its length and pressing evenly spaced notches into the glass, each notch filling with pale light just behind the moving feeler",
   "hardening-a-tor-onion-service": "A matte black multi-shell relay tower of stacked concentric domes, each layer locked by a brass ring, with a single narrow sealed ingress slit glowing soft violet",
   "hello-world": "A minimal dark workbench holding one glowing filament cursor hovering above a blank obsidian slate, first light spilling from a small pulsing pinpoint of light at its corner",
+  "how-i-built-an-automated-music-video-pipeline": "A modular obsidian workstation with a circular glass acoustic resonator, routing three floating neon waveform ribbons into an automated delivery chute on a dark bench",
   "how-i-built-the-digikedai-telegram-bot": "A folded paper-plane shaped obsidian drone docked at a glowing delivery dock module, tethered by a luminous thread to a private gateway pylon behind it",
   "how-i-host-this-blog": "An assembly line of three interlocking obsidian machine modules — a rolling press, a stamping arm and a delivery chute — feeding a sealed glass site cube at the end of the rail",
   "how-i-made-my-own-songs-with-suno-ai": "A shard of amber-lit vinyl suspended inside a dark circular resonator hall, seven smaller song discs orbiting it in a single ring",
@@ -39,6 +38,7 @@
   "passbolt-hang-three-failure-modes": "A brass padlock seal hovering over an obsidian vault door whose three latching bolts are stuck mid-turn, a stalled orange glow pulsing in the keyway",
   "patching-workbench-26-for-mariadb": "A precision instrument module whose connector block has been re-pinned by three hand-cut copper jumpers bridging over its original sealed socket",
   "putting-a-front-door-on-an-app-you-cant-modify": "A new bilingual stone lintel and portal erected in front of a sealed monolithic app block, three thin luminous cables threading through a drilled seam into its interior",
+  "read-amplification-504-gateway-timeout-swr-cache": "Four identical steel pipes drawing from one dark reservoir in a row, and a single short pipe that bypasses all four into one lit chamber",
   "read-only-nocodb-dashboard-for-a-remote-database": "A glass observation window mounted over a distant obsidian data silo, the viewing frame open while every latch on the data hatch itself stays closed",
   "reading-a-containers-own-api-docs": "A scanning beam unfolding a lathe-cut obsidian shell to expose its inner circuit routing, four small inspection tools laid out on the dark bench beside it",
   "replacing-rdpguard-with-ipban": "An old shield slab lifted out of a dark doorway as a tighter woven black mesh gate is lowered into the same frame, grey marker pins fenced off outside it",
@@ -48,6 +48,7 @@
   "scraping-bot-walled-marketplace-warm-browser-session": "A dexterous glass gripper carrying a warm amber-lit browser window pane through a walled dark tunnel gate, holding the pane at a preserved angle",
   "self-healing-digital-goods-entitlements": "A multi-stage floating acrylic workflow pathway with five interlocking diamond gates, automatically bridging broken link fragments with glowing golden solder",
   "self-hosted-speech-to-text-api": "A floating obsidian microphone capsule inside a soundproof dark chamber, its waveform converted into clean engraved grooves on a crystal tablet beside it",
+  "self-hosted-tts-cosyvoice2-n8n-gpu": "A modular dark obsidian voice synthesiser console clamped to a finned copper heatsink pedestal, emitting two floating cyan wave conduits into an automated output port",
   "self-hosting-mem0-memory-stack": "A stack of three interlocking transparent memory capsules above a glowing vector-index lattice core, each capsule holding suspended point-cloud nodes",
   "shipping-an-ai-photo-editor-as-a-wordpress-plugin": "A brushed dark modular cartridge docked into a slot on a wall of stacked obsidian building blocks, a neat pile of thin shims beside it with one cracked shim glowing red",
   "smartctl-exit-code-32-skips-the-disks-that-matter": "A row of dark platter cartridges on an inspection rail where a sorting gate waves the most worn cartridge straight past into an unchecked waste channel",
@@ -63,6 +64,7 @@
   "two-ways-a-javascript-file-stops-working-and-looks-fine": "A luminous display panel that looks perfectly alive while two of its internal conduits are severed beneath the unbroken glass face",
   "unraid-stop-array-hangs-on-swapfile": "A heavy obsidian disk array carriage halted on its rails, an eight-segment anchor block clamping one wheel to the floor frame",
   "upgrading-codeigniter-46-to-47": "An obsidian upgrade manifold whose eight sealed ports run cold and silent while two open ports vent hot red vapour",
+  "uploading-large-videos-to-youtube-via-cdp": "A heavy dark alloy container vault clamped on an inspection rail, fed by a thick vertical data injector conduit, while a thin blue laser probe connects to a recessed port",
   "using-chinese-llm-apis-from-malaysia": "A sealed steel tower module with a single machined keyway and a small suspended counterweight, feeding a distant dark lattice of machined spheres through a long cable run",
   "verifying-a-pdf-report-page-by-page": "Nineteen identically cut crystal sheets fanned in a stack on a dark calibration bench, while a precision measuring caliper checks each sheet's edge alignment",
   "vetting-an-open-source-dependency-before-you-bet-on-it": "A dark dependency crate opened on a bare inspection bench, six inspection checkpoints laid out beside it and one hollow false-bottomed compartment exposed",
@@ -70,13 +72,12 @@
   "why-500000-lines-of-commit-churn-only-left-230000-in-production": "A wide extrusion nozzle laying down an enormous glowing filament coil while a narrow precision sieve beneath it lets only a smaller refined strand fall into a production crate",
   "why-chrome-forgets-its-tabs-in-a-container": "A dark browser window frame whose restored tab slats are scattered outside its own container wall, a small keeper bracket bridging the seam",
   "why-i-still-bought-a-local-gpu": "A dense obsidian accelerator block seated in its own heatsink cradle on a workbench, radiating private warm light while cloud-tethered terminals hang faintly in the dark background",
+  "why-is-my-tts-model-repeating-percent": "A precision optical filter prism mounted on a slotted rail, separating an irregular tangled beam of light into three smooth harmonic wave channels",
   "why-my-on-chain-nft-art-changed-on-windows": "An identical carved art plaque duplicated on two colour-matched plinths, one copy shifted by an extra invisible notch at every edge",
   "why-telegram-bot-notifications-die": "A folded paper-plane drone stopped at a narrow dark archway, its front slot jammed with a crumpled translucent strip and a red glow bleeding out",
   "why-your-cdp-clicks-silently-fail": "A high-precision robotic cursor pointer clicking onto a translucent glass pad that has already shifted away on an invisible kinetic wave, triggering no resonance",
   "why-your-grafana-dashboard-shows-no-data": "A wide wall of forty-one dark telemetry panels all reading blank, one small self-referential filter disc visibly stuck against its own inlet",
   "why-your-headless-browser-cant-scrape-everything": "Two identical dark vault chambers side by side, one sealed shut behind a wall of blank grey panels while the other stands open with warm light spilling from inside",
   "your-disk-full-alert-is-lying": "A tall nearly empty barrel of enormous capacity with a tiny amber fill line at its base, while a thin illuminated arc above it strains against its stop",
-  "yue2-on-a-12gb-gpu-songs-that-lost-their-endings": "A row of slender dark glass tubes standing upright in a black rack on a machined rail, a single horizontal blade bar sweeping across them and cutting every one at the same height, the severed upper segments laid out in a shallow tray beside the rail",
-  "self-hosted-tts-cosyvoice2-n8n-gpu": "A modular dark obsidian voice synthesiser console clamped to a finned copper heatsink pedestal, emitting two floating cyan wave conduits into an automated output port",
-  "why-is-my-tts-model-repeating-percent": "A precision optical filter prism mounted on a slotted rail, separating an irregular tangled beam of light into three smooth harmonic wave channels"
-}
+  "yue2-on-a-12gb-gpu-songs-that-lost-their-endings": "A row of slender dark glass tubes standing upright in a black rack on a machined rail, a single horizontal blade bar sweeping across them and cutting every one at the same height, the severed upper segments laid out in a shallow tray beside the rail"
+}