What is db-conventions?

A data-layer guide for the collector, the part of the system that gathers and stores traffic data. It defines rules for database writes, transactions, time keys, identifiers, CSV lists, and ClickHouse, a database used for analytics.

Writing or reviewing collector queries, database repositories, traffic-statistics updates, time-based reports, and debugging data differences.

It helps prevent duplicate counts, mixed data between backends, incorrect time grouping, and inconsistent database reads or writes.

How foru17/neko-master configures Claude Code

About the project

Neko Master is a dashboard that collects and visualizes network traffic from local gateway environments. It is for monitoring, auditing, and analyzing traffic across multiple gateways, with the catalogue entries providing instructions and skills for working with the dashboard.

foru17/neko-master · 4,243 stars · on GitHub

Reuse

Borrowing it

Nothing to install: this file belongs to foru17/neko-master. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/foru17/neko-master/main/.claude/skills/db-conventions/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/foru17/neko-master

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/foru17/neko-master/db-conventions/github.svg)](https://agentmods.dev/skills/foru17/neko-master/db-conventions)

Your own site

<a href="https://agentmods.dev/skills/foru17/neko-master/db-conventions"><img src="https://agentmods.dev/badge/skills/foru17/neko-master/db-conventions/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/foru17/neko-master/db-conventions"><img src="https://agentmods.dev/badge/skills/foru17/neko-master/db-conventions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 894 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00043	$0.00894
Opus 5.5	$0.00017	$0.00358
Sonnet 5.5	$0.00009	$0.00179
Haiku 4.5	$0.00004	$0.00089

Measured 2mo ago against content hash fa4ac4e7ef45, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

db-conventions scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/db-conventions/SKILL.md · 39 lines

How it starts

The opening of the file, as written. The whole thing — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Data Layer Conventions (apps/collector)

Invariants (breaking any of these has bitten us before)

One write path. All traffic stats go through batchUpdateTrafficStats (database/repositories/traffic-writer.repository.ts); the whole flush is a single outer transaction (inner db.transaction() calls degrade to savepoints). Never commit table groups independently — a mid-flush failure plus buffer retry double-counts.
Rule name = policy group. For multi-hop chains the aggregation key is the last chain hop (the user's policy group), produced only by buildRuleName (shared/utils/rule-name.ts). Rule type + payload (RuleSet(foo)) is the key only for single-hop DIRECT/REJECT chains. The web flow graph and gateway-rule matching depend on this.
Delimiter-aware CSV dedup. Comma-list columns dedupe with INSTR(',' || col || ',', ',' || @v || ',') — bare INSTR substring-matches (a.com inside aa.com) and silently drops values. Lists are capped at LENGTH > 4000.
UTC time keys. Minute YYYY-MM-DDTHH:MM:00, hour YYYY-MM-DDTHH:00:00, via toMinuteKey/toHourKey (base.repository.ts). No local-time truncation.
backendId isolation everywhere. Every stats table, query, and cache key is scoped by backend_id. PRAGMA foreign_keys is OFF — deleting a backend relies on the explicit table list in deleteBackendData; new tables must be added there.
Range routing. Range queries route by span in resolveFactTable (base.repository.ts): ≤6h → minute_dim_stats, >6h → hourly_dim_stats. Retention must respect this: hourly dim tables follow hourlyStatsDays, minute tables follow connectionLogsDays.

SQLite usage

better-sqlite3, synchronous — long scans and big transactions block the event loop shared with WS ingest. Cap query result sets (LIMIT), use Map merges instead of nested findIndex, and prefer prepared statements cached on the instance for hot paths.
WAL mode with tuned pragmas is set in modules/db/db.ts init() (env-tunable: SQLITE_CACHE_MB, SQLITE_WAL_AUTOCHECKPOINT_PAGES, SQLITE_BUSY_TIMEOUT_MS).
Migrations are ad-hoc in init() — idempotent (IF NOT EXISTS / try-catch ALTER / app_config flags for one-time data migrations, see database/rule-name-cleanup.ts as the reference pattern).

Read the full file on GitHub · 39 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 39 lines · 43 tokens per session scan A fa4ac4e7ef45

Subscribe to this mod's changes

db-conventions is a skill published in the GitHub repository foru17/neko-master (4,243 stars, last pushed 27d ago), licensed MIT. It adds 43 tokens to every session and 894 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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db-conventions next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
db-conventionsforu17/neko-master	Skill	4.2k	27d ago	MIT	A	43	Claude Code
data-viz-rendererzebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	62	Claude Code, Codex
building-incident-response-dashboard26zl/cybersec-toolkit	Skill	89	4d ago	MIT	A	66	Claude Code
vue3-map-dashboardznlgis/opengis-skills	Skill	76	10d ago	MIT	A	100	Claude Code, Codex
grafana-dashboardDatus-ai/Datus-agent	Skill	1.9k	yesterday	none	A	18	Claude Code
superset-dashboardDatus-ai/Datus-agent	Skill	1.9k	yesterday	none	A	17	Claude Code
dashboard-designerNickCrew/Claude-Cortex	Skill	66	4mo ago	MIT	A	95	Claude Code, Codex

neko-master: Skill for Claude Code