feat: mission control dashboard, changelog, and timeline endpoint

- CHANGELOG.md: full project history (v1.0.0 → v1.1.0) documenting all
  7 PRs (isro#65–isro#71) in Keep a Changelog format; Unreleased section for today's work
- index.html: complete rewrite — space-themed mission control dashboard;
  live Chart.js visualisations (orbit distribution, mission status, vehicle
  families, top countries by satellite count); animated counters fed from
  /api/stats; responsive star-field background; endpoint quick-reference cards
- style.css: full rewrite with CSS custom properties; dark space palette
  (#080818 bg, #06b8ee accent); responsive grid at 900 px and 600 px breakpoints
- api/timeline.js: GET /api/timeline — aggregates launch dates from
  spacecraft_missions, spacecrafts, and customer_satellites into a unified
  chronological event stream; supports ?date=MM-DD, ?month=YYYY-MM,
  ?year=YYYY, ?range=YYYY,YYYY query params
- isro_api_plan.md: big-picture vision document (10 major platform moves)
- social_posts.md: LinkedIn posts and X thread for all 7 PRs

Author: AdityaAsopa

CHANGELOG.md

@@ -0,0 +1,80 @@
+# Changelog
+
+All notable changes to this project are documented here.
+Format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+---
+
+## [Unreleased]
+
+### Added
+- Interactive dashboard landing page with live Chart.js visualisations
+- `CHANGELOG.md` — this file
+
+---
+
+## [1.1.0] — 2026-03-12
+
+Seven pull requests submitted. All backward-compatible — existing routes,
+wrapper keys, and record counts are unchanged.
+
+### Added — Data
+- `data/spacecraft_missions.json` — normalised to a consistent 17-field schema:
+  - ISO 8601 dates (was: 15+ ad-hoc formats)
+  - Numeric `mass_kg` (was: 9+ field name variants)
+  - Numeric `power_watts` extracted from complex strings
+  - `orbit_type` classification: LEO / SSO / GEO / Lunar / Interplanetary / Failed
+  - `status` inferred from launch date + mission life: active / decommissioned / failed / unknown
+- `data/spacecrafts.json` — 73 of 113 records enriched from missions cross-reference
+  (was: only `id` + `name`)
+- `data/launchers.json` — `vehicle_family` added: SLV / ASLV / PSLV / GSLV / LVM-3 / RLV / Scramjet-TD
+- `data/customer_satellites.json` — ISO dates, numeric mass, normalised country names
+- `data/centres.json` — consistent lowercase field names (`place`, `state`)
+- `scripts/normalize_data.py` — idempotent Python normalisation pipeline
+- `isro_scrape/isro_spacecrafts_scraper_output.json` — fresh scraper output merged into data
+
+### Added — API endpoints
+- `GET /api/stats` — aggregate analytics: counts, orbit/status distributions,
+  country breakdown, vehicle family counts; all computed at runtime ([PR #66](https://github.com/isro/api/pull/66))
+- `GET /api/spacecrafts/:id` — individual spacecraft lookup ([PR #67](https://github.com/isro/api/pull/67))
+- `GET /api/launchers/:id` — individual launcher lookup ([PR #67](https://github.com/isro/api/pull/67))
+- `GET /api/customer_satellites/:id` — individual customer satellite lookup ([PR #67](https://github.com/isro/api/pull/67))
+- `GET /api/centres/:id` — individual centre lookup ([PR #67](https://github.com/isro/api/pull/67))
+- `GET /api/spacecraft_missions/:id` — individual mission lookup ([PR #67](https://github.com/isro/api/pull/67))
+- Query parameter filtering on all collection endpoints ([PR #68](https://github.com/isro/api/pull/68)):
+  - `/api/spacecrafts?status=active&orbit_type=GEO`
+  - `/api/spacecraft_missions?mission_type=Remote+Sensing&orbit_type=SSO`
+  - `/api/customer_satellites?country=Germany`
+  - `/api/launchers?vehicle_family=PSLV`
+  - `/api/centres?state=Karnataka`
+- `_links` object on `/api/spacecrafts/:id` and `/api/spacecraft_missions/:id`
+  with `self` and cross-reference URLs ([PR #69](https://github.com/isro/api/pull/69))
+- `schemas/` — JSON Schema definitions for all five data files ([PR #70](https://github.com/isro/api/pull/70))
+- `scripts/validate_schemas.js` — local schema validation (`npm run validate`) ([PR #70](https://github.com/isro/api/pull/70))
+- `.github/workflows/validate_data.yml` — CI validation on PRs touching `data/` ([PR #70](https://github.com/isro/api/pull/70))
+- `tests/` — Jest test suite: 58 tests across API handlers, ID endpoints, stats,
+  and data integrity ([PR #71](https://github.com/isro/api/pull/71))
+- `.github/workflows/test.yml` — CI test workflow on every PR ([PR #71](https://github.com/isro/api/pull/71))
+
+### Fixed — API handlers ([PR #65](https://github.com/isro/api/pull/65))
+- Removed unused `fs` import from all 6 handlers
+- Fixed misleading variable names (`launchers` → `customerSatellites`, `spacecraftMissions`)
+- Added `Content-Type: application/json` header to all responses
+- Sanitised error responses (no longer leak internal objects)
+- `GET /api` now returns a JSON endpoint directory instead of an HTML string
+
+### Fixed — Landing page ([PR #65](https://github.com/isro/api/pull/65))
+- Added missing `/api/spacecraft_missions` endpoint link
+- Removed hotlinked external images
+
+### Changed
+- `README.md` rewritten: endpoint table with record counts, full schema
+  documentation, data pipeline instructions, contributing guide
+
+---
+
+## [1.0.0] — 2021 (initial release)
+
+Original API with five static JSON endpoints:
+`/api/spacecrafts`, `/api/launchers`, `/api/customer_satellites`,
+`/api/centres`, `/api/spacecraft_missions`.

api/timeline.js

@@ -0,0 +1,98 @@
+const spacecraftMissions = require("../data/spacecraft_missions.json");
+const spacecrafts = require("../data/spacecrafts.json");
+const customerSatellites = require("../data/customer_satellites.json");
+
+function buildEvents() {
+  const events = [];
+
+  for (const m of spacecraftMissions.spacecraft_missions) {
+    if (m.launch_date) {
+      events.push({
+        date: m.launch_date,
+        name: m.name,
+        type: "mission",
+        collection: "spacecraft_missions",
+        id: m.id,
+        orbit_type: m.orbit_type || null,
+        status: m.status,
+      });
+    }
+  }
+
+  // Add spacecrafts that don't have a mission entry (avoid duplicates)
+  const missionNames = new Set(
+    spacecraftMissions.spacecraft_missions.map((m) => m.name.toLowerCase())
+  );
+  for (const s of spacecrafts.spacecrafts) {
+    if (s.launch_date && !missionNames.has(s.name.toLowerCase())) {
+      events.push({
+        date: s.launch_date,
+        name: s.name,
+        type: "spacecraft",
+        collection: "spacecrafts",
+        id: s.id,
+        orbit_type: s.orbit_type || null,
+        status: s.status || null,
+      });
+    }
+  }
+
+  for (const c of customerSatellites.customer_satellites) {
+    if (c.launch_date) {
+      events.push({
+        date: c.launch_date,
+        name: c.id + (c.country ? " (" + c.country + ")" : ""),
+        type: "customer_satellite",
+        collection: "customer_satellites",
+        id: c.id,
+        country: c.country || null,
+        launcher: c.launcher || null,
+      });
+    }
+  }
+
+  events.sort((a, b) => a.date.localeCompare(b.date));
+  return events;
+}
+
+const ALL_EVENTS = buildEvents();
+
+module.exports = async (req, res) => {
+  try {
+    res.setHeader("Content-Type", "application/json");
+    const { date, month, year, range } = req.query;
+    let results = ALL_EVENTS;
+
+    if (date) {
+      // date=04-19 or date=04-19 → match month-day across all years
+      const parts = date.split("-");
+      const mm = parts[0].padStart(2, "0");
+      const dd = parts[1] ? parts[1].padStart(2, "0") : null;
+      results = results.filter((e) => {
+        if (dd) return e.date.slice(5) === mm + "-" + dd;
+        return e.date.slice(5, 7) === mm;
+      });
+    } else if (month) {
+      // month=2023-07 → all events in that month
+      results = results.filter((e) => e.date.startsWith(month));
+    } else if (year) {
+      // year=1975 → all events in that year
+      results = results.filter((e) => e.date.startsWith(year));
+    } else if (range) {
+      // range=1975,2000 → all events from 1975 to 2000 inclusive
+      const [from, to] = range.split(",");
+      results = results.filter((e) => {
+        const y = e.date.slice(0, 4);
+        return y >= from && y <= to;
+      });
+    }
+
+    res.send({
+      count: results.length,
+      events: results,
+    });
+  } catch (error) {
+    res.status(500);
+    res.send({ error: error.message });
+  }
+};