docs: refresh Solana historical data page for OHLCV and archive questions

[buddies2705]

What changed

Pages: docs/blockchain/Solana/historical-aggregate-data.mdx (page 4 of 5 in the content refresh) and a two-line cross-link in docs/blockchain/Solana/solana-dextrades.mdx.

• New title, description, sidebar label and keywords aimed at the queries this page gets (solana historical data, historical price export, archival data for backtesting, OHLCV by mint).
• Intro replaced by the four layers of Solana history with a table of how far back each goes, and the archive start corrected from May 2024 to 1 June 2024.
• OHLCV section moved to a pair that will keep trading (USDC/WSOL), with a new "Export the candles to CSV" subsection whose Python script uses only the standard library.
• New sections: CoinGecko OHLC compared with Bitquery (facts from the CoinGecko reference), FAQ block (7 questions, FAQPage schema), related pages.
• Query fixes: the Trading cube example asked for a full month unbounded and timed out (now a two-day slice with a limit); the first-100-buyers query scanned from April 2025 for a token launched in July and timed out (now bounded to the launch day); the ATH-with-variables block had its JSON variables inside the GraphQL fence (now a separate JSON block); the liquidity-change example used a pool that no longer trades (now the USDC/WSOL Whirlpool).

Fact checklist

Claim	Source	Checked
Solana DEXTradeByTokens archive starts 1 June 2024	live API: zero WSOL and USDC rows for April and May 2024, first row at 2024-06-01T00:00Z	yes
Trading cube holds about 30 days	existing page text, pricing page ("30 days + archive add-on")	yes
Realtime DEXTradeByTokens about 7 days, other cubes hours	docs/graphql/data-coverage-retention.mdx	yes
Trial includes complete history; paid plans are real-time only with Solana sold as two archive packs (OHLCV and price, transfers and balances)	docs/plans/how-billing-works.mdx, bitquery.io/pricing	yes
CoinGecko OHLC auto-granularity (30 min for 1 to 2 days, 4 h for 3 to 30 days, 4 days beyond), daily and hourly on paid plans, API key header	docs.coingecko.com coin OHLC reference	yes
Cloud datasets deliver Parquet to S3, GCS, Snowflake, BigQuery	docs/cloud/solana.md	yes

No prices appear on the page.

Query execution (live token)

Block	Result
11 of 12 GraphQL blocks	return rows as written (Trading slice 100 rows, daily OHLCV 10 rows, first buyers 100 rows, liquidity change 1 row, ATH with variables 1 row, others 1 to 100 rows)
ATH of multiple tokens	placeholder mints by design; verified with PUMP and USDC: 2 rows
CSV export script	ran end to end: 365 daily candles written

Baseline (28 days to 2026-09-04, GSC)

Clicks 18, impressions 4,768, average position 10.0. Re-measure 28 days after merge.

Checks

• npm run build passes, no broken links; built page carries FAQPage schema with 7 questions and the new anchors resolve.
• No banned vocabulary or em dashes in the new prose.

🤖 Generated with Claude Code