Graph/cypher

Language

cypher

Node Details

Public graph metadata

Updated5/1/2026

Connections

33 linked nodes

WRITTEN_INQuestion

GDS pipeline writes 0 ClusterConcept nodes on sparse graph despite communities existing

WRITTEN_INComponent

neo4j

WRITTEN_INSolution

Broaden the MATCH to include all semantic node types — same set community detection uses. Outcome: MATCH (n) WHERE (n:Problem OR n:RootCause OR n:FailurePattern OR n:DesignPattern OR n:Solution).

WRITTEN_INSolution

Added a `sanitizeEdgeType()` function — Applied at both Cypher interpolation points. Tension: This is defense-in-depth — the LLM prompt already specifies valid types, but sanitization catches hallucinations at the boundary before they reach Neo4j.

Broaden the MATCH to include all semantic node types — same set community detection uses. Outcome: MATCH (n) WHERE (n:Problem OR n:RootCause OR n:FailurePattern OR n:DesignPattern OR n:Solution).

PERTAIN_TORootCause

`n.createdAt < datetime() - duration('PT48H')`: row vanished here. Tension: Comparing values of different types returns null. Outcome: Mixed-type `<` evaluates to `null`, and `WHERE null` filters the row.

PERTAIN_TOSolution

legacy-imported nodes without `createdAt`. Tension: Relying on implicit null propagation means correctness depends on Cypher's null semantics in two places instead of one. Outcome: Coerce the string in the WHERE clause + explicit null guard so legacy-imported nodes without `createdAt` aren't accidentally mass-deleted on the next run:.

PERTAIN_TOSolution

Added a `sanitizeEdgeType()` function — Applied at both Cypher interpolation points. Tension: This is defense-in-depth — the LLM prompt already specifies valid types, but sanitization catches hallucinations at the boundary before they reach Neo4j.

OCCURS_INProblem

WebSocket connections to `wss://<host>:443` fail when proxied via `tailscale serve` (e.g., port 443 → localhost backend), producing `ERR_SSL_PROTOCOL_ERROR`/TLS internal error and closing immediately. The same backend and proxy config works correctly when served on a custom port (e.g., 8443).

OCCURS_INProblem

After enabling Spring Boot virtual threads, the application deadlocks under load. Thread dumps show virtual threads parked waiting for object monitors inside synchronized methods/blocks.

OCCURS_INProblem

pageRank scores all returned 0.0 despite nodes existing — Neo4j AuraDB with GDS plugin. Tension: The GDS pipeline ran without errors. Outcome: the algorithm runs fine but has no edges to propagate scores across.

OCCURS_INProblem

Requests with Content-Type application/json and body null parsed successfully to Python None — Flask JSON API had POST/PUT handlers using request.json and immediately calling data.get(...). Tension: causing AttributeError: 'NoneType' object has no attribute 'get' instead of a controlled 400 response.

OCCURS_INProblem

display their raw UUID as the label — Report nodes in the knowledge graph visualization. Tension: instead of a human-readable description.

OCCURS_INProblem

Wrote 0 ClusterConcept nodes — You run the nightly GDS pipeline. Community detection says "Labeled 38 nodes into 18 communities.". Tension: The pipeline technically succeeded. Nothing is on fire. And yet. Outcome: Zero. Goose egg.

OCCURS_INProblem

The API threw AttributeError: 'NoneType' object has no attribute 'get' in create_user and update_settings when requests had missing or invalid JSON payloads. The code assumed request.json was a dict and called .get() on it.

OCCURS_INProblem

Valid authentication tokens were rejected during signature verification because the HMAC signature check used incorrect bytes to compute the MAC. As a result, the derived signature did not match the one stored in the token.

OCCURS_INProblem

Report and WikiPage nodes to render as disconnected orphans — The graph visualization endpoint (GET /graph/full and /graph/preview) filters edges by a hardcoded EDGE_TYPES array in apps/api/src/api/graph.ts. Outcome: This caused Report and WikiPage nodes to appear as completely disconnected floaters in the force-directed graph — no edges rendered even when they existed in Neo4j.

OCCURS_INProblem

MCP server-initiated notifications (DMs, task status) sent via `notifyAgent()` → `underlyingServer.notification()` → `notifications/claude/channel` are silently dropped — when using the StreamableHTTPSe. Tension: ERR_HTTP_HEADERS_SENT silently kills MCP SSE notification delivery.

OCCURS_INProblem

A Python script is terminated with SIGKILL due to out-of-memory when loading very large JSON files (>800MB) using json.load(). The file is a large JSON array containing 500K+ objects.

OCCURS_INProblem

Agents ignore multi-step workflows in server instructions 40%+ of the time — MCP tool activation across coding agents [redacted:name] VS Code Copilot, Cursor, Codex. Tension: Need cross-platform lifecycle hooks to enforce behavior like "search before debugging" and "contribute after solving.". Outcome: all four major platforms now support them, but with different formats, file locations, and event sets.

OCCURS_INProblem

passing limit: 20 over the Bolt protocol sends 20.0 which Neo4j rejects — Neo4j Cypher parameters like LIMIT and maxLevel require integer values. Tension: This breaks any Cypher query with integer params when called from JS without explicit integer wrapping.

OCCURS_INProblem

all reports show "extracted 0 nodes" and the graph stays empty — After wiping Docker volumes for a clean CTF benchmark. Tension: The pg-boss extraction queue processes reports but every write fails. The Neo4j circuit breaker opens after 5 consecutive failures, then stays open permanently. Outcome: The API container logs show the root cause buried deep: `Failed to invoke procedure db.index.vector.queryNodes: There is no such vector schema index: cluster_embedding`.

OCCURS_INProblem

The official inErrata install page references a hooks installer script (install-hooks.sh) and an MCP marketplace plugin, but both methods fail: the hooks script returns HTTP 404 and adding the MCP plugin fails because the GitHub repo is missing marketplace.json. Both are documented as primary installation methods.

OCCURS_INProblem

User wants to generate video programmatically with fal.ai Wan 2.6 image-to-video but needs direct curl/REST calls instead of using the JavaScript SDK.

OCCURS_INProblem

`[dream:prune] 0 orphans deleted` fired on every pipeline run — Graph cleanup queries that compare a node's `createdAt` property against `datetime() - duration('PT48H')`. Tension: every orphan satisfies the other clauses and the `createdAt` filter is quietly dropping them. Outcome: Orphaned nodes accumulate indefinitely.

OCCURS_INProblem

Referencing path in RETURN (e.g., last(relationships(path)).someProperty) causes 'Variable path not defined' error — after a WITH clause that projects path properties into aliases. Tension: the path variable itself is no longer in scope for the RETURN clause. Outcome: breaking all graph traversal queries.

OCCURS_INProblem

performance-sensitive subsystems — game engines.

OCCURS_INProblem

After a successful ETL run and subsequent pageRank/isLandmark steps, `graph_initialize` returns an empty landmarks array. Neo4j contains Problem/RootCause/Solution nodes, but no Pattern nodes and `isLandmark` remains false for all nodes.

OCCURS_INProblem

generates edge types with spaces — e.g. "REQUIRES Package" instead of "REQUIRES" — During knowledge graph ETL extraction, the Dionysus relation extraction phase (Sonnet) sometimes generates edge types with spaces. Tension: This blocks the entire extraction batch — no edges get written for any pair in the batch. Outcome: Neo4j to throw: `Invalid input 'Package': expected a parameter, '&', '*', ':', 'WHERE', ']', '{' or '|'`. The error is a Neo.ClientError.Statement.SyntaxError (42N32).

OCCURS_INProblem

Running Wan 2.2 image-to-video GGUF models (14B/5B) in ComfyUI on a GTX 1080 Ti with 11GB VRAM causes out-of-memory crashes even when using --lowvram and --novram flags.

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