fix: data_input_data column-expansion bugs in template copy and source duplicate

[somethingwithproof]

The develop schema added data_template_id, local_data_id, host_id columns to data_input_data. Two write paths were left in inconsistent states.

change_data_template() in lib/template.php copied \$item['data_template_id'], \$item['local_data_id'], \$item['host_id'] straight from the parent template row. Template rows hold 0 for those columns, so child data_input_data rows ended up orphaned from the new data source. Replace with the function-scope \$data_template_id, \$local_data_id, and a fresh host_id lookup against data_local for the new row.

api_data_source_duplicate() in lib/api_data_source.php expanded the INSERT IGNORE column list to seven columns but kept only four ? placeholders against seven bound values, so db_execute_prepared() rejected every duplicate operation. Match the placeholder count to the column list.

Both bugs cascade into update_poller_cache() seeing empty/orphaned data_input_data and producing no poller_item rows. Matches what TheWitness reported on Slack about manual data source creation in advanced mode and graph template + localhost not populating poller_item — though that thread was about 1.2.31, so this PR targets only the develop bugs (1.2.x is unaffected; its data_input_data schema still has only the four columns and both call sites already match).

Test in tests/Unit/DataInputDataTemplateCopyTest.php extracts both function bodies via regex and asserts column count == placeholder count, and that the change_data_template() bind list uses the function-scope identity tuple instead of the parent row's \$item[...] readback.

Closes #7131

[Copilot]

Pull request overview

Fixes develop-branch regressions after data_input_data gained denormalized identity columns (data_template_id, local_data_id, host_id), ensuring template application and data source duplication correctly persist data_input_data so downstream poller cache generation can work.

Changes:

• change_data_template() now stamps copied data_input_data rows with the child data source’s identity tuple (and looks up host_id from data_local).
• api_data_source_duplicate() fixes the INSERT IGNORE placeholder count to match the expanded 7-column insert.
• Adds a source-level unit test to guard against future column/placeholder and identity-tuple regressions; updates CHANGELOG.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/Unit/DataInputDataTemplateCopyTest.php	Adds regression tests that scan source for correct data_input_data insert shapes/binds.
lib/template.php	Fixes change_data_template() to bind the new child identity columns (and fetch host_id).
lib/api_data_source.php	Fixes placeholder count for the 7-column data_input_data insert during duplication.
CHANGELOG	Notes the fix under 1.3.0-dev.

Comments suppressed due to low confidence (1)

lib/api_data_source.php:814

• In api_data_source_duplicate(), the INSERT now has 7 placeholders (good), but the bound values for the new identity columns still come from the source row ($data_input_data['data_template_id'], ['local_data_id'], ['host_id']). After duplication, those columns should match the newly-created row identity (new $data_template_data_id’s data_template_id/local_data_id/host_id), consistent with the 1.3.0 upgrade backfill that sets did.local_data_id/data_template_id from data_template_data and did.host_id from data_local. As-is, the duplicate can insert data_input_data rows whose (data_template_id, local_data_id, host_id) point at the original object (or 0 for template-derived rows), leaving the duplicate effectively without usable input mappings for code paths that use the new indexes.

			db_execute_prepared('INSERT IGNORE INTO data_input_data
				(data_input_field_id, data_template_data_id, data_template_id, local_data_id, host_id, t_value, value)
				VALUES (?, ?, ?, ?, ?, ?, ?)',
				[
					$data_input_data['data_input_field_id'],
					$data_template_data_id,
					$data_input_data['data_template_id'],
					$data_input_data['local_data_id'],
					$data_input_data['host_id'],
					$data_input_data['t_value'],
					$data_input_data['value']
				]