#### Description
- `fields/values` returns `boolValues` for bool fields: static span
fields such as `has_error`, stored bool attributes (decided by a
row-existence check, so they take no limit slots), and keys the caller
declares bool. `isRoot` and `isEntryPoint` return `true` only, matching
the condition builder.
- `fields/values` honors `startUnixMilli` for logs and traces against
the tag tables. The predicate is `toDate(unix_milli / 1000) >=
toDate(start)`, the partition expression, because the tag tables
deduplicate a value per day and keep whichever hour was inserted last.
For traces this means "span started on or after the start's day", for
logs "ingested on or after the start's day". `endUnixMilli` is ignored.
- `fields/keys` honors `fieldContext` and `fieldDataType` for the static
intrinsic and calculated keys, matches them case-insensitively, types
`isRoot`/`isEntryPoint` as bool, gives meter keys a data type, filters
the traces keys table by tag type for the scope context, and no longer
returns early for the log and scope contexts (logs and audit).
- The span context keeps returning attribute keys, since queries spell
span attributes as `span.<name>`.
- Default quick filters name the span and log fields the way the fields
API serves them (`has_error` as a span bool, `name`, `duration_nano`,
`response_status_code`, `http_host`, `http_url`, `trace_id` as span
fields, `severity_text` as a log field). Migration 126 rewrites the
static fields of every stored quick filter the same way, whatever
context the legacy seeds gave them. Deprecated names such as `hasError`
are not served.
- The API-backed checkbox hook merges `boolValues` into its options; the
`has_error` title is kept.
- The fields/values handler no longer drops `boolValues` from the
response.
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