{"version":3,"file":"redirects-DrMgFKU4.mjs","names":[],"sources":["../src/redirects/loops.ts","../src/api/handlers/redirects.ts"],"sourcesContent":["/**\n * Redirect loop and chain detection utilities.\n *\n * Builds a directed graph from redirect rules and detects:\n * - Cycles (loops): /a → /b → /c → /a\n * - Long chains: /a → /b → /c → /d → /e (exceeding a warning threshold)\n *\n * Handles both exact and pattern redirects. When the walker encounters\n * a path with no exact source match, it tests against compiled pattern\n * sources and resolves the destination using captured parameters.\n */\n\nimport {\n\tcompilePattern,\n\tmatchPattern,\n\tinterpolateDestination,\n\ttype CompiledPattern,\n} from \"./patterns.js\";\n\nexport interface RedirectEdge {\n\tid: string;\n\tsource: string;\n\tdestination: string;\n\tenabled: boolean;\n\tisPattern: boolean;\n}\n\ninterface CompiledPatternRedirect {\n\tid: string;\n\tcompiled: CompiledPattern;\n\tdestination: string;\n}\n\n/**\n * Compile all enabled pattern redirects for matching during graph walks.\n */\nfunction compilePatterns(edges: RedirectEdge[]): CompiledPatternRedirect[] {\n\tconst result: CompiledPatternRedirect[] = [];\n\tfor (const edge of edges) {\n\t\tif (edge.enabled && edge.isPattern) {\n\t\t\tresult.push({\n\t\t\t\tid: edge.id,\n\t\t\t\tcompiled: compilePattern(edge.source),\n\t\t\t\tdestination: edge.destination,\n\t\t\t});\n\t\t}\n\t}\n\treturn result;\n}\n\n/** Single-segment dummy value for representative path generation */\nconst DUMMY_SEGMENT = \"__p__\";\n\n/** Splat pattern: [...paramName] */\nconst SPLAT_RE = /\\[\\.\\.\\.(\\w+)\\]/g;\n\n/** Param pattern: [paramName] */\nconst PARAM_RE = /\\[(\\w+)\\]/g;\n\n/**\n * Extract the literal prefix from a pattern source (everything before the\n * first placeholder), stripped of leading segments shared with a base path.\n * e.g., \"/new/docs/[slug]\" → \"docs/__p__\" (the part after \"/new/\")\n */\nfunction extractPatternSuffix(patternSource: string): string {\n\t// Replace placeholders with dummy values\n\tlet result = patternSource.replace(SPLAT_RE, DUMMY_SEGMENT);\n\tSPLAT_RE.lastIndex = 0;\n\tresult = result.replace(PARAM_RE, DUMMY_SEGMENT);\n\t// Strip leading slash and first segment (e.g., \"/new/docs/__p__\" → \"docs/__p__\")\n\tconst parts = result.split(\"/\").filter(Boolean);\n\treturn parts.slice(1).join(\"/\");\n}\n\n/**\n * Generate representative concrete paths from a template string.\n * Replaces [param] with a dummy segment and [...rest] with multiple\n * depth variants. For catch-alls, also generates representatives using\n * literal prefixes from existing pattern sources to catch cross-pattern loops.\n */\nfunction generateRepresentatives(template: string, existingEdges?: RedirectEdge[]): string[] {\n\tconst hasSplat = SPLAT_RE.test(template);\n\tSPLAT_RE.lastIndex = 0;\n\n\tif (hasSplat) {\n\t\t// Extract the static prefix before the catch-all (e.g., \"/old/\" from \"/old/[...path]\")\n\t\tconst splatIndex = template.indexOf(\"[...\");\n\t\tconst prefix = template.slice(0, splatIndex);\n\n\t\tconst reps = [\n\t\t\ttemplate.replace(SPLAT_RE, DUMMY_SEGMENT).replace(PARAM_RE, DUMMY_SEGMENT),\n\t\t\ttemplate\n\t\t\t\t.replace(SPLAT_RE, `${DUMMY_SEGMENT}/${DUMMY_SEGMENT}`)\n\t\t\t\t.replace(PARAM_RE, DUMMY_SEGMENT),\n\t\t\ttemplate\n\t\t\t\t.replace(SPLAT_RE, `${DUMMY_SEGMENT}/${DUMMY_SEGMENT}/${DUMMY_SEGMENT}`)\n\t\t\t\t.replace(PARAM_RE, DUMMY_SEGMENT),\n\t\t];\n\n\t\t// Add representatives derived from existing pattern sources' literal prefixes\n\t\tif (existingEdges) {\n\t\t\tfor (const edge of existingEdges) {\n\t\t\t\tif (edge.enabled && edge.isPattern && edge.source !== template) {\n\t\t\t\t\tconst suffix = extractPatternSuffix(edge.source);\n\t\t\t\t\tif (suffix) {\n\t\t\t\t\t\treps.push(`${prefix}${suffix}`);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn reps;\n\t}\n\n\treturn [template.replace(PARAM_RE, DUMMY_SEGMENT)];\n}\n\n/**\n * Resolve the next hop for a given path. Tries exact match first,\n * then pattern matching with parameter interpolation for concrete paths,\n * then representative-based matching for template strings.\n */\nfunction resolveNext(\n\tpath: string,\n\tgraph: Map,\n\tpatterns: CompiledPatternRedirect[],\n\tedges?: RedirectEdge[],\n): { destination: string; id: string } | null {\n\t// Exact match (fast) — works for both real paths and template strings\n\tconst exact = graph.get(path);\n\tif (exact) return exact;\n\n\tif (!path.includes(\"[\")) {\n\t\t// Concrete path — try pattern matching directly\n\t\tfor (const pr of patterns) {\n\t\t\tconst params = matchPattern(pr.compiled, path);\n\t\t\tif (params) {\n\t\t\t\tconst resolved = interpolateDestination(pr.destination, params);\n\t\t\t\treturn { destination: resolved, id: pr.id };\n\t\t\t}\n\t\t}\n\t} else {\n\t\t// Template string — generate representative paths and test against patterns\n\t\tconst representatives = generateRepresentatives(path, edges);\n\t\tfor (const pr of patterns) {\n\t\t\tfor (const rep of representatives) {\n\t\t\t\tconst params = matchPattern(pr.compiled, rep);\n\t\t\t\tif (params) {\n\t\t\t\t\tconst resolved = interpolateDestination(pr.destination, params);\n\t\t\t\t\treturn { destination: resolved, id: pr.id };\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn null;\n}\n\n/**\n * Build an adjacency map from redirect edges.\n * Includes both exact and pattern redirects — pattern redirects use their\n * template strings as literal graph edges, which works because EmDash\n * patterns pass parameters through without transformation.\n */\nfunction buildGraph(edges: RedirectEdge[]): Map {\n\tconst graph = new Map();\n\tfor (const edge of edges) {\n\t\tif (edge.enabled) {\n\t\t\tgraph.set(edge.source, { destination: edge.destination, id: edge.id });\n\t\t}\n\t}\n\treturn graph;\n}\n\n/**\n * Detect all redirect IDs that participate in cycles.\n * Walks every node in the graph once, collecting IDs from any cycles found.\n *\n * @returns Array of redirect IDs that are part of a loop\n */\nexport function detectLoops(edges: RedirectEdge[]): string[] {\n\tconst graph = buildGraph(edges);\n\tconst patterns = compilePatterns(edges);\n\tconst visited = new Set();\n\tconst loopRedirectIds = new Set();\n\n\tfor (const [startSource] of graph) {\n\t\tif (visited.has(startSource)) continue;\n\n\t\tconst path: string[] = [];\n\t\tconst pathSet = new Set();\n\t\tconst pathIds: string[] = [];\n\t\tlet current: string | undefined = startSource;\n\n\t\twhile (current) {\n\t\t\tif (pathSet.has(current)) {\n\t\t\t\t// Found a cycle — collect IDs of redirects in the loop\n\t\t\t\tconst loopStart = path.indexOf(current);\n\t\t\t\tfor (const id of pathIds.slice(loopStart)) loopRedirectIds.add(id);\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tif (visited.has(current)) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tconst next = resolveNext(current, graph, patterns, edges);\n\t\t\tif (!next) break;\n\n\t\t\tpath.push(current);\n\t\t\tpathSet.add(current);\n\t\t\tpathIds.push(next.id);\n\t\t\tcurrent = next.destination;\n\t\t}\n\n\t\tfor (const node of path) visited.add(node);\n\t}\n\n\treturn [...loopRedirectIds];\n}\n\n/**\n * Find a compiled pattern redirect whose source matches the given resolved path,\n * returning the source template string for display purposes.\n */\nfunction findMatchingTemplate(\n\tresolvedPath: string,\n\tpatterns: CompiledPatternRedirect[],\n): string | null {\n\tfor (const pr of patterns) {\n\t\tif (matchPattern(pr.compiled, resolvedPath) !== null) {\n\t\t\treturn pr.compiled.source;\n\t\t}\n\t}\n\treturn null;\n}\n\n/**\n * Check if adding or updating a redirect would create a loop.\n *\n * Walks the chain from `destination` through existing redirects.\n * If it reaches `source`, a cycle would form.\n *\n * @returns The loop path if a cycle would be created, or null if safe\n */\nexport function wouldCreateLoop(\n\tsource: string,\n\tdestination: string,\n\texistingEdges: RedirectEdge[],\n\texcludeId?: string,\n): string[] | null {\n\tconst filtered = excludeId ? existingEdges.filter((e) => e.id !== excludeId) : existingEdges;\n\tconst graph = buildGraph(filtered);\n\tconst patterns = compilePatterns(filtered);\n\n\t// If the proposed source is a pattern, compile it so we can check\n\t// whether resolved paths would match it (not just string equality)\n\tconst sourceIsPattern = source.includes(\"[\");\n\tconst compiledSource = sourceIsPattern ? compilePattern(source) : null;\n\n\t// Determine starting points for the walk. If the destination is a\n\t// template, generate representative concrete paths AND find existing\n\t// exact sources in the graph that match the template.\n\tlet startingPoints: string[];\n\tif (destination.includes(\"[\")) {\n\t\tconst reps = generateRepresentatives(destination, filtered);\n\t\t// Also find existing exact graph keys that match this template\n\t\tconst compiled = compilePattern(destination);\n\t\tfor (const [key] of graph) {\n\t\t\tif (!key.includes(\"[\") && matchPattern(compiled, key) !== null) {\n\t\t\t\treps.push(key);\n\t\t\t}\n\t\t}\n\t\t// Always include the destination itself — it may be an exact graph key\n\t\t// (e.g., /a/sub/[...path] exists as a literal source in the graph)\n\t\treps.push(destination);\n\t\tstartingPoints = reps;\n\t} else {\n\t\tstartingPoints = [destination];\n\t}\n\n\tfor (const start of startingPoints) {\n\t\tconst path = [source, destination];\n\t\tlet current = start;\n\t\tconst seen = new Set([source, destination, start]);\n\n\t\t// Walk the chain until it ends or we revisit a node\n\t\t// eslint-disable-next-line no-constant-condition -- terminates via return/break when chain ends or cycle found\n\t\twhile (true) {\n\t\t\tconst next = resolveNext(current, graph, patterns, filtered);\n\t\t\tif (!next) break; // chain ends, try next starting point\n\n\t\t\t// Check if we've looped back — either exact match or pattern match\n\t\t\tconst loopsBack =\n\t\t\t\tseen.has(next.destination) ||\n\t\t\t\t(compiledSource !== null && matchPattern(compiledSource, next.destination) !== null);\n\n\t\t\tif (loopsBack) {\n\t\t\t\t// Show the source template instead of dummy resolved path\n\t\t\t\tconst displayPath =\n\t\t\t\t\t!seen.has(next.destination) && compiledSource !== null ? source : next.destination;\n\t\t\t\tpath.push(displayPath);\n\t\t\t\treturn path; // cycle found\n\t\t\t}\n\n\t\t\t// If the resolved path contains dummy segments, try to find the\n\t\t\t// original pattern template that produced it for cleaner display\n\t\t\tconst cleanDest = next.destination.includes(DUMMY_SEGMENT)\n\t\t\t\t? (findMatchingTemplate(next.destination, patterns) ?? next.destination)\n\t\t\t\t: next.destination;\n\t\t\tpath.push(cleanDest);\n\t\t\tseen.add(next.destination);\n\t\t\tcurrent = next.destination;\n\t\t}\n\t}\n\n\treturn null;\n}\n","/**\n * Redirect CRUD and 404 log handlers\n */\n\nimport type { Kysely } from \"kysely\";\n\nimport { OptionsRepository } from \"../../database/repositories/options.js\";\nimport {\n\tRedirectRepository,\n\ttype Redirect,\n\ttype NotFoundEntry,\n\ttype NotFoundSummary,\n} from \"../../database/repositories/redirect.js\";\nimport { InvalidCursorError } from \"../../database/repositories/types.js\";\nimport type { FindManyResult } from \"../../database/repositories/types.js\";\nimport type { Database } from \"../../database/types.js\";\nimport { wouldCreateLoop, detectLoops, type RedirectEdge } from \"../../redirects/loops.js\";\nimport { validatePattern, validateDestinationParams, isPattern } from \"../../redirects/patterns.js\";\nimport { isTerminalStatus } from \"../../redirects/status.js\";\nimport type { ApiResult } from \"../types.js\";\n\n// ---------------------------------------------------------------------------\n// Redirects\n// ---------------------------------------------------------------------------\n\n/**\n * List redirects with cursor pagination and optional filters\n */\nexport async function handleRedirectList(\n\tdb: Kysely,\n\tparams: {\n\t\tcursor?: string;\n\t\tlimit?: number;\n\t\tsearch?: string;\n\t\tgroup?: string;\n\t\tenabled?: boolean;\n\t\tauto?: boolean;\n\t},\n): Promise & { loopRedirectIds?: string[] }>> {\n\ttry {\n\t\tconst repo = new RedirectRepository(db);\n\t\tconst result = await repo.findMany(params);\n\n\t\tconst loopRedirectIds = await getLoopRedirectIds(db);\n\n\t\treturn {\n\t\t\tsuccess: true,\n\t\t\tdata: {\n\t\t\t\t...result,\n\t\t\t\t...(loopRedirectIds.length > 0 ? { loopRedirectIds } : {}),\n\t\t\t},\n\t\t};\n\t} catch (error) {\n\t\tif (error instanceof InvalidCursorError) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: { code: \"INVALID_CURSOR\", message: error.message },\n\t\t\t};\n\t\t}\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"REDIRECT_LIST_ERROR\", message: \"Failed to fetch redirects\" },\n\t\t};\n\t}\n}\n\n/**\n * Create a redirect rule\n */\nexport async function handleRedirectCreate(\n\tdb: Kysely,\n\tinput: {\n\t\tsource: string;\n\t\tdestination?: string;\n\t\ttype?: number;\n\t\tenabled?: boolean;\n\t\tgroupName?: string | null;\n\t},\n): Promise> {\n\ttry {\n\t\tconst repo = new RedirectRepository(db);\n\n\t\tconst type = input.type ?? 301;\n\t\t// Terminal statuses (410 Gone / 451) are served directly and have no\n\t\t// destination — skip the destination/loop checks for them.\n\t\tconst terminal = isTerminalStatus(type);\n\t\tconst destination = terminal ? \"\" : (input.destination ?? \"\");\n\n\t\t// Source and destination must differ\n\t\tif (!terminal && input.source === destination) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: {\n\t\t\t\t\tcode: \"VALIDATION_ERROR\",\n\t\t\t\t\tmessage: \"Source and destination must be different\",\n\t\t\t\t},\n\t\t\t};\n\t\t}\n\n\t\t// If source looks like a pattern, validate it\n\t\tconst sourceIsPattern = isPattern(input.source);\n\t\tif (sourceIsPattern) {\n\t\t\tconst patternError = validatePattern(input.source);\n\t\t\tif (patternError) {\n\t\t\t\treturn {\n\t\t\t\t\tsuccess: false,\n\t\t\t\t\terror: { code: \"VALIDATION_ERROR\", message: `Invalid source pattern: ${patternError}` },\n\t\t\t\t};\n\t\t\t}\n\n\t\t\t// Validate destination params reference valid source params\n\t\t\t// (terminal rules have no destination to interpolate)\n\t\t\tif (!terminal) {\n\t\t\t\tconst destError = validateDestinationParams(input.source, destination);\n\t\t\t\tif (destError) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\tsuccess: false,\n\t\t\t\t\t\terror: { code: \"VALIDATION_ERROR\", message: destError },\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Check for duplicate source (exact match only for non-patterns)\n\t\tconst existing = await repo.findBySource(input.source);\n\t\tif (existing) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: {\n\t\t\t\t\tcode: \"CONFLICT\",\n\t\t\t\t\tmessage: `A redirect from \"${input.source}\" already exists`,\n\t\t\t\t},\n\t\t\t};\n\t\t}\n\n\t\t// Check for redirect loops (skip if creating as disabled, or terminal —\n\t\t// a Gone rule has no destination, so it can't form a loop)\n\t\tif (!terminal && input.enabled !== false) {\n\t\t\tconst edges = toEdges(await repo.findAllEnabled());\n\t\t\tconst loopPath = wouldCreateLoop(input.source, destination, edges);\n\t\t\tif (loopPath) return loopError(loopPath);\n\t\t}\n\n\t\tconst redirect = await repo.create({\n\t\t\tsource: input.source,\n\t\t\tdestination,\n\t\t\ttype,\n\t\t\tisPattern: sourceIsPattern,\n\t\t\tenabled: input.enabled ?? true,\n\t\t\tgroupName: input.groupName ?? null,\n\t\t});\n\n\t\treturn { success: true, data: redirect };\n\t} catch {\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"REDIRECT_CREATE_ERROR\", message: \"Failed to create redirect\" },\n\t\t};\n\t}\n}\n\n/**\n * Get a redirect by ID\n */\nexport async function handleRedirectGet(\n\tdb: Kysely,\n\tid: string,\n): Promise> {\n\ttry {\n\t\tconst repo = new RedirectRepository(db);\n\t\tconst redirect = await repo.findById(id);\n\n\t\tif (!redirect) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: { code: \"NOT_FOUND\", message: `Redirect \"${id}\" not found` },\n\t\t\t};\n\t\t}\n\n\t\treturn { success: true, data: redirect };\n\t} catch {\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"REDIRECT_GET_ERROR\", message: \"Failed to fetch redirect\" },\n\t\t};\n\t}\n}\n\n/**\n * Update a redirect by ID\n */\nexport async function handleRedirectUpdate(\n\tdb: Kysely,\n\tid: string,\n\tinput: {\n\t\tsource?: string;\n\t\tdestination?: string;\n\t\ttype?: number;\n\t\tenabled?: boolean;\n\t\tgroupName?: string | null;\n\t},\n): Promise> {\n\ttry {\n\t\tconst repo = new RedirectRepository(db);\n\n\t\tconst existing = await repo.findById(id);\n\t\tif (!existing) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: { code: \"NOT_FOUND\", message: `Redirect \"${id}\" not found` },\n\t\t\t};\n\t\t}\n\n\t\tconst newSource = input.source ?? existing.source;\n\t\tconst newDest = input.destination ?? existing.destination;\n\n\t\t// Source and destination must differ\n\t\tif (newSource === newDest) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: {\n\t\t\t\t\tcode: \"VALIDATION_ERROR\",\n\t\t\t\t\tmessage: \"Source and destination must be different\",\n\t\t\t\t},\n\t\t\t};\n\t\t}\n\n\t\t// If source is changing, validate patterns\n\t\tif (input.source !== undefined) {\n\t\t\tconst sourceIsPattern = isPattern(input.source);\n\t\t\tif (sourceIsPattern) {\n\t\t\t\tconst patternError = validatePattern(input.source);\n\t\t\t\tif (patternError) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\tsuccess: false,\n\t\t\t\t\t\terror: {\n\t\t\t\t\t\t\tcode: \"VALIDATION_ERROR\",\n\t\t\t\t\t\t\tmessage: `Invalid source pattern: ${patternError}`,\n\t\t\t\t\t\t},\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Check for duplicate source (exclude self)\n\t\t\tconst dup = await repo.findBySource(input.source);\n\t\t\tif (dup && dup.id !== id) {\n\t\t\t\treturn {\n\t\t\t\t\tsuccess: false,\n\t\t\t\t\terror: {\n\t\t\t\t\t\tcode: \"CONFLICT\",\n\t\t\t\t\t\tmessage: `A redirect from \"${input.source}\" already exists`,\n\t\t\t\t\t},\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\n\t\t// Validate destination params against the (possibly updated) source\n\t\tconst newSourceIsPattern = isPattern(newSource);\n\t\tif (newSourceIsPattern) {\n\t\t\tconst destError = validateDestinationParams(newSource, newDest);\n\t\t\tif (destError) {\n\t\t\t\treturn {\n\t\t\t\t\tsuccess: false,\n\t\t\t\t\terror: { code: \"VALIDATION_ERROR\", message: destError },\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\n\t\t// Check for redirect loops if source or destination changed\n\t\tif (input.source !== undefined || input.destination !== undefined) {\n\t\t\tconst edges = toEdges(await repo.findAllEnabled());\n\t\t\tconst loopPath = wouldCreateLoop(newSource, newDest, edges, id);\n\t\t\tif (loopPath) return loopError(loopPath);\n\t\t}\n\n\t\tconst updated = await repo.update(id, {\n\t\t\tsource: input.source,\n\t\t\tdestination: input.destination,\n\t\t\ttype: input.type,\n\t\t\tenabled: input.enabled,\n\t\t\tgroupName: input.groupName,\n\t\t});\n\n\t\tif (!updated) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: { code: \"REDIRECT_UPDATE_ERROR\", message: \"Failed to update redirect\" },\n\t\t\t};\n\t\t}\n\n\t\t// Recompute cache — redirect was modified, so re-fetch\n\t\tawait updateLoopCache(db);\n\n\t\treturn { success: true, data: updated };\n\t} catch {\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"REDIRECT_UPDATE_ERROR\", message: \"Failed to update redirect\" },\n\t\t};\n\t}\n}\n\n/**\n * Delete a redirect by ID\n */\nexport async function handleRedirectDelete(\n\tdb: Kysely,\n\tid: string,\n): Promise> {\n\ttry {\n\t\tconst repo = new RedirectRepository(db);\n\t\tconst deleted = await repo.delete(id);\n\n\t\tif (!deleted) {\n\t\t\treturn {\n\t\t\t\tsuccess: false,\n\t\t\t\terror: { code: \"NOT_FOUND\", message: `Redirect \"${id}\" not found` },\n\t\t\t};\n\t\t}\n\n\t\tawait updateLoopCache(db);\n\n\t\treturn { success: true, data: { deleted: true } };\n\t} catch {\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"REDIRECT_DELETE_ERROR\", message: \"Failed to delete redirect\" },\n\t\t};\n\t}\n}\n\n// ---------------------------------------------------------------------------\n// Loop analysis cache\n// ---------------------------------------------------------------------------\n\nfunction loopError(loopPath: string[]): ApiResult {\n\tconst hops = loopPath\n\t\t.slice(0, -1)\n\t\t.map((p, i) => `${p} \\u2192 ${loopPath[i + 1]}`)\n\t\t.join(\"\\n\");\n\treturn {\n\t\tsuccess: false,\n\t\terror: {\n\t\t\tcode: \"VALIDATION_ERROR\",\n\t\t\tmessage: `This redirect would create a loop:\\n${hops}`,\n\t\t},\n\t};\n}\n\nfunction toEdges(redirects: Redirect[]): RedirectEdge[] {\n\treturn redirects.map((r) => ({\n\t\tid: r.id,\n\t\tsource: r.source,\n\t\tdestination: r.destination,\n\t\tenabled: r.enabled,\n\t\tisPattern: r.isPattern,\n\t}));\n}\n\nconst LOOP_CACHE_KEY = \"_redirect_loop_ids\";\n\n/**\n * Recompute loop redirect IDs and store in the options table.\n */\nasync function updateLoopCache(db: Kysely): Promise {\n\ttry {\n\t\tconst options = new OptionsRepository(db);\n\t\tconst edges = toEdges(await new RedirectRepository(db).findAllEnabled());\n\t\tconst loopRedirectIds = detectLoops(edges);\n\t\tawait options.set(LOOP_CACHE_KEY, loopRedirectIds);\n\t} catch (error) {\n\t\tconsole.error(\"Failed to update redirect loop cache:\", error);\n\t}\n}\n\n/**\n * Get loop redirect IDs from cache, computing lazily on first access.\n */\nasync function getLoopRedirectIds(db: Kysely): Promise {\n\ttry {\n\t\tconst options = new OptionsRepository(db);\n\t\tconst cached = await options.get(LOOP_CACHE_KEY);\n\t\tif (cached !== null) return cached;\n\n\t\t// First access after upgrade — compute and cache\n\t\tawait updateLoopCache(db);\n\t\treturn (await options.get(LOOP_CACHE_KEY)) ?? 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RedirectRepository(db);\n\t\tconst deleted = await repo.prune404s(olderThan);\n\t\treturn { success: true, data: { deleted } };\n\t} catch {\n\t\treturn {\n\t\t\tsuccess: false,\n\t\t\terror: { code: \"NOT_FOUND_PRUNE_ERROR\", message: \"Failed to prune 404 log\" 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