Fix European trip return heuristic for weekend location tracking

Adjust European short trip heuristic from >3 days to >1 day to correctly
detect when user has returned home from European trips. This fixes the
April 29-30, 2023 case where the location incorrectly showed "Sankt Georg, Hamburg"
instead of "Bristol" when the user was free (no events scheduled) after
the foss-north trip ended on April 27.

The previous logic required more than 3 days to pass before assuming
return home from European countries, but for short European trips by
rail/ferry, users typically return within 1-2 days.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/ajv/lib/vocabularies/discriminator/index.ts

@@ -0,0 +1,110 @@
+import type {CodeKeywordDefinition, AnySchemaObject, KeywordErrorDefinition} from "../../types"
+import type {KeywordCxt} from "../../compile/validate"
+import {_, getProperty, Name} from "../../compile/codegen"
+import {DiscrError, DiscrErrorObj} from "../discriminator/types"
+import {resolveRef, SchemaEnv} from "../../compile"
+import {schemaHasRulesButRef} from "../../compile/util"
+
+export type DiscriminatorError = DiscrErrorObj<DiscrError.Tag> | DiscrErrorObj<DiscrError.Mapping>
+
+const error: KeywordErrorDefinition = {
+  message: ({params: {discrError, tagName}}) =>
+    discrError === DiscrError.Tag
+      ? `tag "${tagName}" must be string`
+      : `value of tag "${tagName}" must be in oneOf`,
+  params: ({params: {discrError, tag, tagName}}) =>
+    _`{error: ${discrError}, tag: ${tagName}, tagValue: ${tag}}`,
+}
+
+const def: CodeKeywordDefinition = {
+  keyword: "discriminator",
+  type: "object",
+  schemaType: "object",
+  error,
+  code(cxt: KeywordCxt) {
+    const {gen, data, schema, parentSchema, it} = cxt
+    const {oneOf} = parentSchema
+    if (!it.opts.discriminator) {
+      throw new Error("discriminator: requires discriminator option")
+    }
+    const tagName = schema.propertyName
+    if (typeof tagName != "string") throw new Error("discriminator: requires propertyName")
+    if (schema.mapping) throw new Error("discriminator: mapping is not supported")
+    if (!oneOf) throw new Error("discriminator: requires oneOf keyword")
+    const valid = gen.let("valid", false)
+    const tag = gen.const("tag", _`${data}${getProperty(tagName)}`)
+    gen.if(
+      _`typeof ${tag} == "string"`,
+      () => validateMapping(),
+      () => cxt.error(false, {discrError: DiscrError.Tag, tag, tagName})
+    )
+    cxt.ok(valid)
+
+    function validateMapping(): void {
+      const mapping = getMapping()
+      gen.if(false)
+      for (const tagValue in mapping) {
+        gen.elseIf(_`${tag} === ${tagValue}`)
+        gen.assign(valid, applyTagSchema(mapping[tagValue]))
+      }
+      gen.else()
+      cxt.error(false, {discrError: DiscrError.Mapping, tag, tagName})
+      gen.endIf()
+    }
+
+    function applyTagSchema(schemaProp?: number): Name {
+      const _valid = gen.name("valid")
+      const schCxt = cxt.subschema({keyword: "oneOf", schemaProp}, _valid)
+      cxt.mergeEvaluated(schCxt, Name)
+      return _valid
+    }
+
+    function getMapping(): {[T in string]?: number} {
+      const oneOfMapping: {[T in string]?: number} = {}
+      const topRequired = hasRequired(parentSchema)
+      let tagRequired = true
+      for (let i = 0; i < oneOf.length; i++) {
+        let sch = oneOf[i]
+        if (sch?.$ref && !schemaHasRulesButRef(sch, it.self.RULES)) {
+          sch = resolveRef.call(it.self, it.schemaEnv.root, it.baseId, sch?.$ref)
+          if (sch instanceof SchemaEnv) sch = sch.schema
+        }
+        const propSch = sch?.properties?.[tagName]
+        if (typeof propSch != "object") {
+          throw new Error(
+            `discriminator: oneOf subschemas (or referenced schemas) must have "properties/${tagName}"`
+          )
+        }
+        tagRequired = tagRequired && (topRequired || hasRequired(sch))
+        addMappings(propSch, i)
+      }
+      if (!tagRequired) throw new Error(`discriminator: "${tagName}" must be required`)
+      return oneOfMapping
+
+      function hasRequired({required}: AnySchemaObject): boolean {
+        return Array.isArray(required) && required.includes(tagName)
+      }
+
+      function addMappings(sch: AnySchemaObject, i: number): void {
+        if (sch.const) {
+          addMapping(sch.const, i)
+        } else if (sch.enum) {
+          for (const tagValue of sch.enum) {
+            addMapping(tagValue, i)
+          }
+        } else {
+          throw new Error(`discriminator: "properties/${tagName}" must have "const" or "enum"`)
+        }
+      }
+
+      function addMapping(tagValue: unknown, i: number): void {
+        if (typeof tagValue != "string" || tagValue in oneOfMapping) {
+          throw new Error(`discriminator: "${tagName}" values must be unique strings`)
+        }
+        oneOfMapping[tagValue] = i
+      }
+    }
+  },
+}
+
+export default def

node_modules/ajv/lib/vocabularies/discriminator/types.ts

@@ -0,0 +1,12 @@
+import type {ErrorObject} from "../../types"
+
+export enum DiscrError {
+  Tag = "tag",
+  Mapping = "mapping",
+}
+
+export type DiscrErrorObj<E extends DiscrError> = ErrorObject<
+  "discriminator",
+  {error: E; tag: string; tagValue: unknown},
+  string
+>