diff --git a/apps/labrinth/fixtures/delphi-trace-rules.sql b/apps/labrinth/fixtures/delphi-trace-rules.sql
new file mode 100644
index 0000000000..03d7ab790d
--- /dev/null
+++ b/apps/labrinth/fixtures/delphi-trace-rules.sql
@@ -0,0 +1,342 @@
+-- Development fixtures for the Delphi trace-rule editor and scanner.
+-- This file is idempotent and only replaces rows using the fixture namespace.
+
+BEGIN;
+
+DELETE FROM delphi_rule_effects
+WHERE rule_id IN (
+	SELECT id
+	FROM delphi_rules
+	WHERE name LIKE '[DEV trace-rule fixture]%'
+);
+
+DELETE FROM delphi_reports
+WHERE artifact_url = 'https://example.invalid/fixtures/delphi-trace-rules.json';
+
+DELETE FROM delphi_rules
+WHERE name LIKE '[DEV trace-rule fixture]%';
+
+WITH fixture_report AS (
+	INSERT INTO delphi_reports (
+		file_id,
+		delphi_version,
+		artifact_url,
+		severity
+	)
+	VALUES (
+		NULL,
+		18,
+		'https://example.invalid/fixtures/delphi-trace-rules.json',
+		'malware'
+	)
+	RETURNING id
+), fixture_issues AS (
+	INSERT INTO delphi_report_issues (report_id, issue_type)
+	SELECT fixture_report.id, fixture_issue.issue_type
+	FROM fixture_report
+	CROSS JOIN (
+		VALUES
+			('OBFUSCATED_NAMES'),
+			('SUSPICIOUS_NETWORK_ACCESS'),
+			('RUNTIME_EXEC_USAGE'),
+			('BUNDLED_LIBRARY'),
+			('HARDCODED_URL'),
+			('CRYPTO_MINING_SIGNATURE'),
+			('CLASSLOADER_USAGE'),
+			('NATIVE_LIBRARY_LOAD')
+	) AS fixture_issue(issue_type)
+	RETURNING id, issue_type
+)
+INSERT INTO delphi_report_issue_details (
+	issue_id,
+	key,
+	jar,
+	file_path,
+	decompiled_source,
+	data,
+	severity
+)
+SELECT
+	fixture_issues.id,
+	fixture_detail.key,
+	fixture_detail.jar,
+	fixture_detail.file_path,
+	fixture_detail.decompiled_source,
+	fixture_detail.data,
+	fixture_detail.severity::delphi_severity
+FROM fixture_issues
+INNER JOIN (
+	VALUES
+		(
+			'OBFUSCATED_NAMES',
+			'dev-trace-rules/obfuscation/known-bootstrap',
+			'META-INF/jars/bootstrap.jar',
+			'com/example/bootstrap/Bootstrap.class',
+			'class Bootstrap { /* generated fixture */ }',
+			'{"confidence": 0.99, "symbol_count": 58}'::jsonb,
+			'high'
+		),
+		(
+			'OBFUSCATED_NAMES',
+			'dev-trace-rules/obfuscation/unknown-library',
+			NULL,
+			'com/example/internal/A.class',
+			'class A { /* generated fixture */ }',
+			'{"confidence": 0.71, "symbol_count": 240}'::jsonb,
+			'high'
+		),
+		(
+			'SUSPICIOUS_NETWORK_ACCESS',
+			'dev-trace-rules/network/malware-host',
+			NULL,
+			'com/example/network/Backdoor.class',
+			'class Backdoor { /* generated fixture */ }',
+			'{"host": "evil.example", "port": 4444, "protocol": "tcp"}'::jsonb,
+			'medium'
+		),
+		(
+			'SUSPICIOUS_NETWORK_ACCESS',
+			'dev-trace-rules/network/telemetry-host',
+			NULL,
+			'com/example/telemetry/TelemetryClient.class',
+			'class TelemetryClient { /* generated fixture */ }',
+			'{"host": "telemetry.example.com", "port": 443, "protocol": "https"}'::jsonb,
+			'medium'
+		),
+		(
+			'SUSPICIOUS_NETWORK_ACCESS',
+			'dev-trace-rules/network/unmatched-host',
+			NULL,
+			'com/example/update/UpdateChecker.class',
+			'class UpdateChecker { /* generated fixture */ }',
+			'{"host": "api.github.com", "port": 443, "protocol": "https"}'::jsonb,
+			'low'
+		),
+		(
+			'RUNTIME_EXEC_USAGE',
+			'dev-trace-rules/runtime/powershell',
+			NULL,
+			'com/example/platform/WindowsHelper.class',
+			'class WindowsHelper { /* generated fixture */ }',
+			'{"command": "powershell.exe", "arguments": ["-EncodedCommand", "fixture"]}'::jsonb,
+			'high'
+		),
+		(
+			'RUNTIME_EXEC_USAGE',
+			'dev-trace-rules/runtime/desktop-opener',
+			NULL,
+			'com/example/platform/DesktopBrowser.class',
+			'class DesktopBrowser { /* generated fixture */ }',
+			'{"command": "xdg-open", "arguments": ["https://example.com/docs"]}'::jsonb,
+			'medium'
+		),
+		(
+			'RUNTIME_EXEC_USAGE',
+			'dev-trace-rules/runtime/unmatched-java',
+			NULL,
+			'com/example/launcher/JavaLauncher.class',
+			'class JavaLauncher { /* generated fixture */ }',
+			'{"command": "java", "arguments": ["-version"]}'::jsonb,
+			'low'
+		),
+		(
+			'BUNDLED_LIBRARY',
+			'dev-trace-rules/library/example-helper',
+			'META-INF/jars/example-helper.jar',
+			'com/example/helper/Helper.class',
+			NULL,
+			'{"library": "example-helper", "version": "1.0.0"}'::jsonb,
+			'high'
+		),
+		(
+			'BUNDLED_LIBRARY',
+			'dev-trace-rules/library/kotlin-runtime',
+			'META-INF/jars/kotlin-stdlib.jar',
+			'kotlin/collections/CollectionsKt.class',
+			NULL,
+			'{"library": "kotlin-stdlib", "version": "2.1.0"}'::jsonb,
+			'medium'
+		),
+		(
+			'HARDCODED_URL',
+			'dev-trace-rules/url/known-documentation',
+			NULL,
+			'com/example/help/DocumentationLink.class',
+			'class DocumentationLink { /* generated fixture */ }',
+			'{"url": "https://docs.example.com/help"}'::jsonb,
+			'low'
+		),
+		(
+			'HARDCODED_URL',
+			'dev-trace-rules/url/unmatched-webhook',
+			NULL,
+			'com/example/integration/WebhookClient.class',
+			'class WebhookClient { /* generated fixture */ }',
+			'{"url": "https://hooks.example.net/incoming"}'::jsonb,
+			'medium'
+		),
+		(
+			'CRYPTO_MINING_SIGNATURE',
+			'dev-trace-rules/crypto/randomx-miner',
+			NULL,
+			'com/example/worker/NativeWorker.class',
+			'class NativeWorker { /* generated fixture */ }',
+			'{"algorithm": "randomx", "pool": "pool.example"}'::jsonb,
+			'severe'
+		),
+		(
+			'CLASSLOADER_USAGE',
+			'dev-trace-rules/classloader/plugin-loader',
+			'META-INF/jars/plugin-api.jar',
+			'com/example/plugin/PluginLoader.class',
+			'class PluginLoader { /* generated fixture */ }',
+			'{"purpose": "plugin-discovery", "parent_first": true}'::jsonb,
+			'high'
+		),
+		(
+			'NATIVE_LIBRARY_LOAD',
+			'dev-trace-rules/native/unmatched-jna',
+			'META-INF/jars/jna.jar',
+			'com/sun/jna/Native.class',
+			NULL,
+			'{"library": "jnidispatch", "platform": "linux-x86_64"}'::jsonb,
+			'high'
+		)
+) AS fixture_detail(
+	issue_type,
+	key,
+	jar,
+	file_path,
+	decompiled_source,
+	data,
+	severity
+) USING (issue_type);
+
+INSERT INTO delphi_rules (name, rule, priority, revision)
+VALUES
+	(
+		'[DEV trace-rule fixture] Escalate known malware host',
+		'trace.issue_type == "SUSPICIOUS_NETWORK_ACCESS" && trace.data.host == "evil.example" ? {"severity": "malware"} : null',
+		1000,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Escalate crypto-mining signatures',
+		'trace.issue_type == "CRYPTO_MINING_SIGNATURE" && trace.data.algorithm == "randomx" ? {"severity": "malware"} : null',
+		900,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Escalate encoded PowerShell',
+		'trace.issue_type == "RUNTIME_EXEC_USAGE" && trace.data.command == "powershell.exe" ? {"severity": "severe"} : null',
+		800,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Hide known-safe obfuscation',
+		'trace.issue_type == "OBFUSCATED_NAMES" && trace.data.confidence >= 0.95 ? {"severity": "hidden"} : null',
+		700,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Downgrade known telemetry',
+		'trace.issue_type == "SUSPICIOUS_NETWORK_ACCESS" && trace.data.host == "telemetry.example.com" ? {"severity": "low"} : null',
+		600,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Downgrade desktop URL openers',
+		'trace.issue_type == "RUNTIME_EXEC_USAGE" && trace.data.command == "xdg-open" ? {"severity": "low"} : null',
+		500,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Downgrade bundled libraries',
+		'trace.issue_type == "BUNDLED_LIBRARY" ? {"severity": "low"} : null',
+		400,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Hide documentation URLs',
+		'trace.issue_type == "HARDCODED_URL" && trace.data.url == "https://docs.example.com/help" ? {"severity": "hidden"} : null',
+		300,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Downgrade plugin classloaders',
+		'trace.issue_type == "CLASSLOADER_USAGE" && trace.data.purpose == "plugin-discovery" ? {"severity": "low"} : null',
+		200,
+		(SELECT revision FROM delphi_rule_revisions LIMIT 1)
+	),
+	(
+		'[DEV trace-rule fixture] Pending native-library exception',
+		'trace.issue_type == "NATIVE_LIBRARY_LOAD" && trace.data.library == "jnidispatch" ? {"severity": "low"} : null',
+		100,
+		(SELECT revision + 1 FROM delphi_rule_revisions LIMIT 1)
+	);
+
+INSERT INTO delphi_rule_effects (revision, detail_id, rule_id, severity)
+SELECT
+	(SELECT revision FROM delphi_rule_revisions LIMIT 1),
+	detail.id,
+	rule.id,
+	fixture_effect.severity::delphi_severity
+FROM (
+	VALUES
+		(
+			'dev-trace-rules/network/malware-host',
+			'[DEV trace-rule fixture] Escalate known malware host',
+			'malware'
+		),
+		(
+			'dev-trace-rules/crypto/randomx-miner',
+			'[DEV trace-rule fixture] Escalate crypto-mining signatures',
+			'malware'
+		),
+		(
+			'dev-trace-rules/runtime/powershell',
+			'[DEV trace-rule fixture] Escalate encoded PowerShell',
+			'severe'
+		),
+		(
+			'dev-trace-rules/obfuscation/known-bootstrap',
+			'[DEV trace-rule fixture] Hide known-safe obfuscation',
+			'hidden'
+		),
+		(
+			'dev-trace-rules/network/telemetry-host',
+			'[DEV trace-rule fixture] Downgrade known telemetry',
+			'low'
+		),
+		(
+			'dev-trace-rules/runtime/desktop-opener',
+			'[DEV trace-rule fixture] Downgrade desktop URL openers',
+			'low'
+		),
+		(
+			'dev-trace-rules/library/example-helper',
+			'[DEV trace-rule fixture] Downgrade bundled libraries',
+			'low'
+		),
+		(
+			'dev-trace-rules/library/kotlin-runtime',
+			'[DEV trace-rule fixture] Downgrade bundled libraries',
+			'low'
+		),
+		(
+			'dev-trace-rules/url/known-documentation',
+			'[DEV trace-rule fixture] Hide documentation URLs',
+			'hidden'
+		),
+		(
+			'dev-trace-rules/classloader/plugin-loader',
+			'[DEV trace-rule fixture] Downgrade plugin classloaders',
+			'low'
+		)
+) AS fixture_effect(detail_key, rule_name, severity)
+INNER JOIN delphi_report_issue_details detail
+	ON detail.key = fixture_effect.detail_key
+INNER JOIN delphi_rules rule
+	ON rule.name = fixture_effect.rule_name;
+
+COMMIT;