Update cookbook recipes to use TICK syntax for date filtering (#352)

Replace legacy dateadd(), today(), yesterday(), now() patterns with the
new TICK syntax across 27 cookbook recipes:

- timestamp IN today() → timestamp IN '$today'
- timestamp IN yesterday() → timestamp IN '$yesterday'
- timestamp > dateadd('d', -1, now()) → timestamp IN '$now - 1d..$now'
- @lookback := dateadd(...) → @lookback := '$now - Xd..$now'

Also simplifies VWAP query to use direct window function division.

Adds new elapsed-time recipe in time-series patterns.

Author: javier

documentation/cookbook/demo-data-schema.md

@@ -62,7 +62,7 @@ The table tracks **30 currency pairs**: EURUSD, GBPUSD, USDJPY, USDCHF, AUDUSD,
 
 ```questdb-sql demo title="Recent core_price updates"
 SELECT * FROM core_price
-WHERE timestamp IN today()
+WHERE timestamp IN '$today'
 LIMIT -10;
 ```
 
@@ -116,7 +116,7 @@ SELECT timestamp, symbol,
        array_count(bids[1]) as bid_levels,
        array_count(asks[1]) as ask_levels
 FROM market_data
-WHERE timestamp IN today()
+WHERE timestamp IN '$today'
 LIMIT -5;
 ```
 
@@ -170,7 +170,7 @@ CREATE TABLE 'fx_trades' (
 
 ```questdb-sql demo title="Recent FX trades"
 SELECT * FROM fx_trades
-WHERE timestamp IN today()
+WHERE timestamp IN '$today'
 LIMIT -10;
 ```
 

documentation/cookbook/integrations/grafana/variable-dropdown.md

@@ -193,7 +193,7 @@ The PostgreSQL data source recognizes `__text` and `__value` as special column n
 **Different filter conditions:**
 ```sql
 -- Filter by time range
-WHERE timestamp IN yesterday()
+WHERE timestamp IN '$yesterday'
 
 -- Filter by multiple criteria
 WHERE symbol LIKE '%USDT' AND price > 1000

documentation/cookbook/sql/advanced/conditional-aggregates.md

@@ -33,7 +33,7 @@ SELECT
   sum(CASE WHEN amount <= 1.0 THEN amount END) as small_trade_volume,
   sum(amount) as total_volume
 FROM trades
-WHERE timestamp >= dateadd('d', -1, now())
+WHERE timestamp IN '$now - 1d..$now'
   AND symbol IN ('BTC-USDT', 'ETH-USDT')
 GROUP BY symbol;
 ```

documentation/cookbook/sql/advanced/consistent-histogram-buckets.md

@@ -20,7 +20,7 @@ SELECT
   floor(amount / @bucket_size) * @bucket_size AS bucket,
   count(*) AS count
 FROM trades
-WHERE symbol = 'BTC-USDT' AND timestamp IN today()
+WHERE symbol = 'BTC-USDT' AND timestamp IN '$today'
 GROUP BY bucket
 ORDER BY bucket;
 ```
@@ -53,7 +53,7 @@ DECLARE @bucket_count := 50
 
 WITH raw_data AS (
   SELECT price, amount FROM trades
-  WHERE symbol = 'BTC-USDT' AND timestamp IN today()
+  WHERE symbol = 'BTC-USDT' AND timestamp IN '$today'
 ),
 bucket_size AS (
   SELECT (max(price) - min(price)) / (@bucket_count - 1) AS bucket_size FROM raw_data
@@ -83,7 +83,7 @@ SELECT
 FROM trades
 WHERE symbol = 'BTC-USDT'
   AND amount > 0.000001 -- optional. Just adding here for easier visualization
-  AND timestamp IN today()
+  AND timestamp IN '$today'
 GROUP BY bucket
 ORDER BY bucket;
 ```
@@ -104,7 +104,7 @@ SELECT
   END AS bucket,
   count(*) AS count
 FROM trades
-WHERE symbol = 'BTC-USDT' AND timestamp IN today()
+WHERE symbol = 'BTC-USDT' AND timestamp IN '$today'
 GROUP BY bucket;
 ```
 
@@ -119,7 +119,7 @@ SELECT
   floor(amount / @bucket_size) * @bucket_size AS bucket,
   count(*) AS count
 FROM trades
-WHERE symbol = 'BTC-USDT' AND timestamp IN today()
+WHERE symbol = 'BTC-USDT' AND timestamp IN '$today'
 SAMPLE BY 1h
 ORDER BY timestamp, bucket;
 ```

documentation/cookbook/sql/advanced/local-min-max.md

@@ -19,7 +19,7 @@ SELECT timestamp, bid_price,
   min(bid_price) OVER (ORDER BY timestamp RANGE 1 second PRECEDING) AS min_price,
   max(bid_price) OVER (ORDER BY timestamp RANGE 1 second PRECEDING) AS max_price
 FROM core_price
-WHERE timestamp >= dateadd('m', -1, now()) AND symbol = 'EURUSD';
+WHERE timestamp IN '$now - 1m..$now' AND symbol = 'EURUSD';
 ```
 
 This returns the minimum and maximum bid price from the 1 second preceding each row.
@@ -35,7 +35,7 @@ SELECT p.timestamp, p.bid_price,
 FROM core_price p
 WINDOW JOIN core_price pp ON symbol
   RANGE BETWEEN 1 second PRECEDING AND 1 second FOLLOWING
-WHERE p.timestamp >= dateadd('m', -1, now()) AND p.symbol = 'EURUSD';
+WHERE p.timestamp IN '$now - 1m..$now' AND p.symbol = 'EURUSD';
 ```
 
 This returns the minimum and maximum bid price from 1 second before to 1 second after each row.

documentation/cookbook/sql/advanced/pivot-with-others.md

@@ -13,7 +13,7 @@ You want to pivot data so that specific symbols (like EURUSD, GBPUSD, USDJPY) be
 ```questdb-sql demo title="Aggregated data per symbol"
 SELECT timestamp, symbol, SUM(bid_volume) AS total_bid
 FROM core_price
-WHERE timestamp IN today()
+WHERE timestamp IN '$today'
 SAMPLE BY 1m
 LIMIT 20;
 ```
@@ -55,7 +55,7 @@ SELECT timestamp,
   SUM(CASE WHEN symbol NOT IN ('EURUSD', 'GBPUSD', 'USDJPY')
     THEN bid_volume END) AS OTHERS
 FROM core_price
-WHERE timestamp IN today()
+WHERE timestamp IN '$today'
 SAMPLE BY 1m
 LIMIT 5;
 ```

documentation/cookbook/sql/advanced/rows-before-after-value-match.md

@@ -27,7 +27,7 @@ SELECT timestamp, bid_price,
   LEAD(bid_price, 4) OVER () AS next_4,
   LEAD(bid_price, 5) OVER () AS next_5
 FROM core_price
-WHERE timestamp >= dateadd('m', -1, now()) AND symbol = 'EURUSD';
+WHERE timestamp IN '$now - 1m..$now' AND symbol = 'EURUSD';
 ```
 
 ## How it works

documentation/cookbook/sql/advanced/sankey-funnel.md

@@ -43,7 +43,7 @@ WITH PrevEvents AS (
     timestamp,
     lag(timestamp) OVER (PARTITION BY visitor_id ORDER BY timestamp) AS prev_ts
   FROM
-    events WHERE timestamp > dateadd('d', -7, now())
+    events WHERE timestamp IN '$now - 7d..$now'
     AND metric_name = 'page_view'
 ), VisitorSessions AS (
   SELECT *,

documentation/cookbook/sql/advanced/top-n-plus-others.md

@@ -31,7 +31,7 @@ WITH totals AS (
     symbol,
     count() as total
   FROM trades
-  WHERE timestamp >= dateadd('d', -1, now())
+  WHERE timestamp IN '$now - 1d..$now'
 ),
 ranked AS (
   SELECT
@@ -160,7 +160,7 @@ Results in three groups: top 5 individual, ranks 6-10 combined, rest combined.
 WITH totals AS (
   SELECT symbol, count() as total
   FROM trades
-  WHERE timestamp >= dateadd('d', -1, now())
+  WHERE timestamp IN '$now - 1d..$now'
 ),
 ranked AS (
   SELECT *, rank() OVER (ORDER BY total DESC) as ranking
@@ -196,7 +196,7 @@ WITH totals AS (
     side,
     count() as total
   FROM trades
-  WHERE timestamp >= dateadd('d', -1, now())
+  WHERE timestamp IN '$now - 1d..$now'
 ),
 ranked AS (
   SELECT

documentation/cookbook/sql/advanced/unpivot-table.md

@@ -42,7 +42,7 @@ WITH pivoted AS (
     CASE WHEN side = 'buy' THEN price END as buy,
     CASE WHEN side = 'sell' THEN price END as sell
   FROM trades
-  WHERE timestamp >= dateadd('m', -5, now())
+  WHERE timestamp IN '$now - 5m..$now'
     AND symbol = 'ETH-USDT'
 ),
 unpivoted AS (
@@ -114,7 +114,7 @@ WITH sensor_data AS (
     humidity,
     pressure
   FROM sensors
-  WHERE timestamp >= dateadd('h', -1, now())
+  WHERE timestamp IN '$now - 1h..$now'
 )
 SELECT timestamp, sensor_id, 'temperature' as metric, temperature as value FROM sensor_data
 WHERE temperature IS NOT NULL